研究者データベース

加美山 隆(カミヤマ タカシ)
工学研究院 応用量子科学部門 物質量子工学
教授

基本情報

所属

  • 工学研究院 応用量子科学部門 物質量子工学

職名

  • 教授

学位

  • 博士(工学)(東北大学)
  • 工学修士(東北大学)

J-Global ID

研究キーワード

  • 動的構造   ガラス   液体   Dynamical Structure   Glass   Liquid   

研究分野

  • ナノテク・材料 / 無機材料、物性
  • ナノテク・材料 / 基礎物理化学
  • 自然科学一般 / 数理物理、物性基礎

職歴

  • 1991年 - 1996年 北海道大学 助手
  • 1991年 - 1996年 Hokkaido University, Research Assistant
  • 1996年 - 北海道大学大学院 助教授
  • 1996年 - Hokkaido University, Associate Professor

学歴

  •         - 1991年   東北大学   工学研究科   材料物性学
  •         - 1991年   東北大学
  •         - 1987年   東北大学   工学部   材料物性学科
  •         - 1987年   東北大学

所属学協会

  • 日本中性子科学会   日本原子力学会   物理学会   化学会   金属学会   

研究活動情報

論文

  • Takashi Kamiyama, Kazuma Hirano, Hirotaka Sato, Kanta Ono, Yuta Suzuki, Daisuke Ito, Yasushi Saito
    Applied Sciences 11 13 5988 - 5988 2021年06月27日 [査読有り]
     
    In neutron transmission spectroscopic imaging, the transmission spectrum of each pixel on a two-dimensional detector is analyzed and the real-space distribution of microscopic information in an object is visualized with a wide field of view by mapping the obtained parameters. In the analysis of the transmission spectrum, since the spectrum can be classified with certain characteristics, it is possible for machine learning methods to be applied. In this study, we selected the subject of solid–liquid phase fraction imaging as the simplest application of the machine learning method. Firstly, liquid and solid transmission spectra have characteristic shapes, so spectrum classification according to their fraction can be carried out. Unsupervised and supervised machine learning analysis methods were tested and evaluated with simulated datasets of solid–liquid spectrum combinations. Then, the established methods were used to perform an analysis with actual measured spectrum datasets. As a result, the solid–liquid interface zone was specified from the solid–liquid phase fraction imaging using machine learning analysis.
  • Yosuke Sakurai, Hirotaka Sato, Nozomu Adachi, Satoshi Morooka, Yoshikazu Todaka, Takashi Kamiyama
    Applied Sciences 11 11 5219 - 5219 2021年06月04日 [査読有り]
     
    As a new method for evaluating single crystals and oligocrystals, pulsed neutron Bragg-dip transmission analysis/imaging method is being developed. In this study, a single Bragg-dip profile-fitting analysis method was newly developed, and applied for analyzing detailed inner information in a crystalline grain position-dependently. In the method, the spectrum profile of a single Bragg-dip is analyzed at each position over a grain. As a result, it is expected that changes in crystal orientation, mosaic spread angle and thickness of a perfect crystal can be evaluated from the wavelength, the width and the integrated intensity of the Bragg-dip, respectively. For confirming this effectiveness, the method was applied to experimental data of position-dependent Bragg-dip transmission spectra of a Si-steel plate consisting of oligocrystals. As a result, inner information of multiple crystalline grains could be visualized and evaluated. The small change in crystal orientation in a grain, about 0.4°, could be observed by imaging the Bragg-dip wavelengths. By imaging the Bragg-dip widths, both another grain and mosaic block in a grain were detected. Furthermore, imaging results of the integrated intensities of Bragg-dips were consistent with the results of Bragg-dip width imaging. These small crystallographic changes have not been observed and visualized by previous Bragg-dip analysis methods.
  • Shinya Hosokawa, Takashi Kamiyama, Koji Yoshida, Toshio Yamaguchi, Satoshi Tsutsui, Alfred Q.R. Baron
    Journal of Molecular Liquids 332 115825 - 115825 2021年06月 [査読有り]
  • Hirotaka Sato, Miyuki Sato, Yuhua Su, Takenao Shinohara, Takashi Kamiyama
    ISIJ International 61 5 1584 - 1593 2021年05月15日 [査読有り]
  • Yuta Abe, Yusuke Tsuchikawa, Tetsuya Kai, Yoshihiro Matsumoto, Joseph D. Parker, Takenao Shinohara, Yuji Ohishi, Takashi Kamiyama, Yuji Nagae, Ikken Sato
    Proceedings of the 3rd J-PARC Symposium (J-PARC2019) 2021年03月26日
  • Kazuhiro Mori, Ryo Okumura, Hirofumi Yoshino, Masaya Kanayama, Setsuo Satoh, Yojiro Oba, Kenji Iwase, Haruhiro Hiraka, Masahiro Hino, Tadafumi Sano, Yuji Kawabata, Takashi Kamiyama, Toshiya Otomo, Toshiharu Fukunaga
    Proceedings of the 3rd J-PARC Symposium (J-PARC2019) 2021年03月26日
  • Masatoshi Arai, Ken H. Andersen, Dimitri N. Argyriou, Werner Schweika, Luca Zanini, Stefanus Harjo, Takashi Kamiyama, Masahide Harada
    Journal of Neutron Research 23 4 215 - 232 2021年 
    The general performance of diffractometers at the first long pulse spallation source ESS, is compared with their counterparts at J-PARC, a short pulse spallation source. The difference in the inherent pulse structure of these neutron sources presents opportunities for new concepts for instrumentation, where performance does not scale simply with source power. The article describes advantages and disadvantages of those diffractometers, adapting to the very different source characteristics. We find that the two sources offer comparable performance in flux and resolution when operating in high-resolution mode. ESS offers significant advantages in tunability and flexibility, notably in the ability to relax resolution in order to increase flux for a given experiment. The slow repetition rate of ESS favors long instruments. On the other hand, J-PARC instruments perform very well in spite of the lower source power and allow better access to epithermal neutrons, of particular interest for PDF analysis of diffraction data.
  • H. Sato, K. Iwase, T. Kamiyama, Y. Kiyanagi
    ISIJ International 60 6 2020年12月 [査読有り][通常論文]
  • Hidenori Iwashita, Gentaro Funatsu, Hirotaka Sato, Takashi Kamiyama, Michihiro Furusaka, Stephen A. Wender, Eric Pitcher, Yoshiaki Kiyanagi
    IEEE Transactions on Nuclear Science 67 11 2363 - 2369 2020年11月 [査読有り]
  • Kazuhiro Mori, Yoshiyuki Morita, Takashi Saito, Takashi Kamiyama, Toshiya Otomo, Takeshi Abe, Toshiharu Fukunaga
    Journal of Physical Chemistry C 124 34 18452 - 18461 2020年08月27日 
    All-solid-state fluoride shuttle batteries (FSBs) present endless possibilities for next-generation rechargeable batteries. However, no standard choice for solid electrolytes and electrodes in FSBs has been established to date. Additionally, details of how F ions travel through the working device are yet to be fully understood. Here, we studied the electrochemical properties of tysonite Ce0.95A0.05F2.95 (A = Ca, Sr, and Ba) and Ce0.95Mg0.05F2.95 (actually, a composite of CeF3 and MgF2) solid electrolytes, and their crystal structures using neutron diffraction data. In particular, Ce0.95Ca0.05F2.95 exhibited the highest electrical conductivity and the shortest bond between F ions. Furthermore, F-vacancies introduced by the substitution of Ca2+ for Ce3+ were accommodated only at the F1 site. The bond valence sum (BVS) analysis results indicated that there was a significant difference in the BVS values of F ions: BVS(F1) = −0.92 on [F1] layers, and BVS(F2) = −1.13 and BVS(F3) = −1.07 on [M (=Ce0.95Ca0.05), F2, F3] layers, which were stacked alternately along the c-axis of the trigonal cell. The BVS(F2) value was relatively lower than the BVS(F1) and BVS(F3) ones, indicating that F2 is tightly bonded to M compared to that of F1 or F3. The findings suggested that F1−F1 and F1−F3 sublattices play a key role in the high mobility of the conducting F ions.
  • Yuta Abe, Yusuke Tsuchikawa, Tetsuya Kai, Yoshihiro Matsumoto, Joseph D. Parker, Takenao Shinohara, Yuji Ohishi, Takashi Kamiyama, Yuji Nagae, Ikken Sato
    Volume 2: Nuclear Policy; Nuclear Safety, Security, and Cyber Security; Operating Plant Experience; Probabilistic Risk Assessments; SMR and Advanced Reactors 2020年08月04日 
    Abstract Boron carbide is used as a neutron-absorbing material in Fukushima-Daiichi Nuclear Power Station (1F), producing borides that are twice as hard as oxides (such as UO2 and ZrO2). The high neutron absorption of boron affects the evaluation of re-criticality during the process of debris retrieval. Therefore, it is important not only to determine the presence of boron but also to investigate the distribution of boron inside the material in a non-destructive manner during decommissioning. To address the uncertainties in the core material relocation behavior of boiling water reactor (BWR) during a severe accident (SA), solidified melt specimens of a simulated fuel assembly were prepared by plasma heating. If core material melting and relocation (CMMR) specimens can be used to estimate the B distribution in 1F Unit-3, that will provide valuable information in the decommissioning of 1F. To address this, the authors focused on the energy-resolved neutron-imaging system, RADEN, which utilizes a wide energy range, from meV to keV. This is an innovative three-dimensional analysis technology for boride distribution that affects the evaluation of hardness and re-criticality. In the calibration standard samples (ZrxB1-x and FexB1-x), there was a good correlation between boron concentration and the energy-dependence of the cross sections of cold and epithermal neutrons. In the CMMR specimens, boron distribution was confirmed from the contrast difference between cold and epithermal neutrons. In the future, the results of calibration standard samples will be applied to the results of CMMR specimens. With this method, three-dimensional boron distribution will be measured, and the understanding of boride distribution 1F Unit-3 will be improved, which may be reflected in an improved SA code.
  • Takenao Shinohara, Tetsuya Kai, Kenichi Oikawa, Takeshi Nakatani, Mariko Segawa, Kosuke Hiroi, Yuhua Su, Motoki Ooi, Masahide Harada, Hiroshi Iikura, Hirotoshi Hayashida, Joseph D. Parker, Yoshihiro Matsumoto, Takashi Kamiyama, Hirotaka Sato, Yoshiaki Kiyanagi
    Review of Scientific Instruments 91 4 043302 - 043302 2020年04月01日 [査読有り][通常論文]
  • Kazuhiro Mori, Atsushi Mineshige, Takashi Saito, Maiko Sugiura, Yoshihisa Ishikawa, Fumika Fujisaki, Kaoru Namba, Takashi Kamiyama, Toshiya Otomo, Takeshi Abe, Toshiharu Fukunaga
    ACS Applied Energy Materials 3 3 2873 - 2880 2020年03月23日 
    All-solid-state fluoride shuttle batteries (FSBs) have the potential to become the next generation of rechargeable batteries. However, there are gaps in the fundamentals of developing all-solid-state FSBs. For example, the mechanism by which the F- ions travel through a working device is not yet fully understood. In this work, we use a cutting-edge neutron diffractometer and a suite of analysis programs to perform Rietveld refinements. We employ the maximum entropy method to experimentally determine the F- ion diffusion pathways in the superior solid electrolyte with a fluorite-type structure, namely, Ba0.6La0.4F2.4. We show that the excessive F- ions, located at the specific interstitial sites, migrate to the neighboring F- ion sites based on the interstitialcy diffusion mechanism at the operating temperature for all-solid-state FSBs. Understanding the diffusion mechanism of F- ions plays a key role in the development of solid electrolytes for all-solid-state FSBs, particularly for those that can operate at room temperature.
  • Ryoichi Kajimoto, Kenji Nakajima, Masaki Fujita, Motoyuki Ishikado, Shuki Toni, Yoshihisa Ishikawa, Ping Miao, Takashi Kamiyama
    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 88 11 2019年11月 
    A high-resolution time-of-flight powder neutron diffraction study of the layered nickel oxide Pr2-xSrxNiO4 with x = 0.7 and 0.9 was performed to characterize the crystal structures of these highly hole-doped nickelates. For the sample with x = 0.7, the Ni-O bond lengths decrease uniformly with decreasing temperature, and the atomic displacement parameters are similar to those for x = 1/3. In contrast, for the sample with x = 0.9, the out-of-plane Ni-O bond length shows a sharp thermal contraction in the high-temperature region, which is suggestive of changes in the orbital occupation accompanied by the development of checkerboard-type charge correlations. Furthermore, the x = 0.9 sample is characterized by a large atomic displacement parameter for the apical O atoms along the out-of-plane direction, which is interpreted as the existence of two types of Ni3+ sites with different orbital occupancies. The distinct difference between the x = 0.9 sample and the lower-concentration compounds should be related to the development of checkerboard-type charge ordering in the metallic matrix and possible orbital ordering at the Ni3+ sites at x similar to 1 in the hole-doped layered nickel oxides.
  • Hirotaku Ishikawa, Tetsuya Kai, Hirotaka Sato, Takashi Kamiyama
    Journal of Nuclear Science and Technology 56 2 221 - 227 2019年02月 [査読有り][通常論文]
  • H. Sato, K. Mochiki, K. Tanaka, K. Ishizuka, H. Ishikawa, T. Kamiyama, Y. Kiyanagi
    Nuclear Instruments and Methods in Physics Research Section A 943 162501  2019年 [査読有り][通常論文]
  • Inverse Pole Figure Mapping of Crystalline Grains by Bragg-dip Neutron Transmission Imaging
    H. Sato, Y. Shiota, S. Morooka, Y. Todaka, N. Adachi, S. Sadamatsu, K. Oikawa, M. Harada, S. Y. Zhang, Y. H. Su, T. Kamiyama, M. Ohnuma, M. Furusaka, T. Shinohara, Y. Kiyanagi
    J-PARC Annual Report 2017 Volume 2: Materials and Life Science Experimental Facility (MLF Annual Report 2017) J-PARC 18-04 8 - 10 2019年 [査読無し][招待有り]
  • H.Sato, T. Sasaki, T. Moriya, H. Ishikawa, T. Kamiyama, M. Furusaka
    Physica B: Condensed Matter 551 452 - 459 2018年12月15日 [査読有り][通常論文]
  • Wu Gong, Kazuya Aizawa, Stefanus Harjo, Ruixiao Zheng, Takuro Kawasaki, Jun Abe, Takashi Kamiyama, Nobuhiro Tsuji
    INTERNATIONAL JOURNAL OF PLASTICITY 111 288 - 306 2018年12月 
    Hot extrusion is an effective process for strengthening magnesium alloys. In this study, we investigated the hot extrusion strengthening mechanism in an Mg97Zn1Y2 alloy with a duplex microstructure consisting of a long period stacking ordered (LPSO) phase and an alpha-Mg phase. The deformation behavior of Mg97Zn1Y2 alloys in the as-cast and as-extruded states was examined by in situ neutron diffraction during uniaxial compression tests. The results show that the yield strength of Mg97Zn1Y2 alloy was substantially enhanced by hot extrusion. The LPSO phase yielded at a rather low stress of -50 MPa in the as-cast alloy via basal slip. However, the LPSO phase persisted elastic behavior and shared additional lattice stress after the yielding of the alpha-Mg matrix until the onset of kink deformation at -289 MPa in the as-extruded alloy. The conjunction of basal slip in LPSO phase and the surrounding coherent alpha-Mg matrix is believed to be the reason for the relative low yield stress of the LPSO phase in the as-cast alloy. The quantitative evaluation of phase stress partition confirmed that the LPSO phase was significantly enhanced by hot extrusion and kink deformation of the LPSO phase plays an important role in preserving ductility.
  • Junpei Koide, Toshiyuki Uragaki, Naoto Hagura, Jun Kawarabayashi, Koh Ichi Mochiki, Hiroyuki Hasemi, Takashi Kamiyama, Tadafumi Sano, Daisuke Ito, Yoshiyuki Takahashi, Jun Ichi Hori, Ken Nakajima
    2017 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2017 - Conference Proceedings 2018年11月12日 
    The neutron resonance absorption imaging [1] is very competent technique to analyze the concentration of specific fissile nuclides in nuclear fuel pellets. To take transmitted image of neutrons with the relatively high energy of tens of eV and with the time resolution of 100 ns, a neutron GEM detector was used. However, the spatial resolution of this imaging detector is insufficient for conformity inspection. To solve this problem super-resolution method with sub-pixel shifting and calculation had been experimentally tried using a thick-GEM with the pixel resolution of 0.8 mm. From the reconstruction of 16 images taken by sub-pixel shift 1.0 mm Cd line pair was clearly recognized.
  • 加美山隆, 日塔光一
    波紋 28 2 77‐83 - 289 2018年05月10日 [査読有り][通常論文]
  • 加美山 隆, 長谷美 宏幸, 佐藤 博隆
    非破壊検査 : 検査と材料評価 : journal of the Japanese Society for Non-destructive Inspection 67 5 217 - 225 2018年05月 [査読無し][通常論文]
  • Measurement and simulation of the neutron capture reaction using NaCl samples
    K. Y. Hara, N. Fujii, T. Kamiyama, Y. Narita, H. Sato, S. Nakamura, Y. Toh
    Proceedings of the 2016 Symposium on Nuclear Data JAEA-Conf 2017-001 169 - 174 2018年 [査読有り][通常論文]
  • Transmission Measurements for a Neutron Imaging Using a Boron-type Neutron Grid
    K. Y. Hara, M. Asako, T. Kamiyama, H. Sato, Y. Uehara, K. Oikawa, T. Shinohara
    Proceedings of the 2017 Symposium on Nuclear Data JAEA-Conf 2018-001 193 - 198 2018年 [査読有り][通常論文]
  • Hirotaku Ishikawa, Hirotaka Sato, Takashi Kamiyama
    Physica B: Condensed Matter 551 355 - 358 2018年 [査読有り][通常論文]
     
    To perform quantitative analysis of constituent elements, including light atoms, by time-of-flight (TOF) type neutron imaging, a new analysis method using epithermal neutrons excluding resonance dips has been proposed. The method is based on fitting the theoretical neutron transmission spectrum calculated from evaluated nuclear data to a measured neutron transmission spectrum. Compared to conventional imaging methods such as those using neutron radiography or neutron resonance analysis, it has the advantage of being able to evaluate multiple/light elements. We applied this technique to a pulsed neutron transmission experiment at the Hokkaido University Neutron Source. A stack of iron and carbon plates was measured as a model sample consisting of heavy and light elements. The evaluated elemental densities show reasonable agreements within an error of 10%.
  • Hirotaka Sato, Yoshinori Shiota, Satoshi Morooka, Yoshikazu Todaka, Nozomu Adachi, Sunao Sadamatsu, Kenichi Oikawa, Masahide Harada, Shuoyuan Zhang, Yuhua Su, Takashi Kamiyama, Masato Ohnuma, Michihiro Furusaka, Takenao Shinohara, Yoshiaki Kiyanagi
    JOURNAL OF APPLIED CRYSTALLOGRAPHY 50 6 1601 - 1610 2017年12月 [査読有り][通常論文]
     
    A new mapping procedure for polycrystals using neutron Bragg-dip transmission is presented. This is expected to be useful as a new materials characterization tool which can simultaneously map the crystallographic direction of grains parallel to the incident beam. The method potentially has a higher spatial resolution than neutron diffraction imaging. As a demonstration, a Bragg-dip neutron transmission experiment was conducted at J-PARC on beamline MLF BL10 NOBORU. A large-grained Si-steel plate was used. Since this specimen included multiple grains along the neutron beam transmission path, it was a challenging task for existing methods to analyse the direction of the crystal lattice of each grain. A new data-analysis method for Bragg-dip transmission measurements was developed based on database matching. As a result, the number of grains and their crystallographic direction along the neutron transmission path have been determined.
  • Kaoru Y. Hara, Hirotaka Sato, Takashi Kamiyama, Takenao Shinohara
    EPJ Web of Conferences 146 2017年09月13日 [査読有り][通常論文]
     
    By using a composite source system, we measured radiographs of the thermal neutron and keV X-ray in the 45-MeV electron linear accelerator facility at Hokkaido University. The source system provides the alternative beam of neutron and X-ray by switching the production target onto the electron beam axis. In the measurement to demonstrate a complementary imaging, the detector based on a vacuum-tube type neutron color image intensifier was applied to the both beams for dual-purpose. On the other hand, for reducing background in a neutron transmission spectrum, test measurements using a gadolinium-type neutron grid were performed with a cold neutron source at Hokkaido University. In addition, the simulations of the neutron and X-ray transmissions for various substances were performed using the PHITS code. A data analysis procedure for estimating the substance of sample was investigated through the simulations.
  • Measurements of neutronic characteristics of rectangular and cylindrical coupled hydrogen moderators
    Kai T, Kamiyama T, Hiraga F, Ooi M, Hirota K, Kiyanagi Y
    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY 55 3 283 - 289 2017年03月 [査読有り][通常論文]
  • Daisuke Ito, Tadafumi Sano, Jun Ichi Hori, Yoshiyuki Takahashi, Hiroyuki Hasemi, Takashi Kamiyama, Ken Nakajima
    Physics Procedia 88 89 - 94 2017年 [査読有り][通常論文]
     
    © 2017 The Authors. An integrated assessment method for a nuclear fuel with high decay heat and high radioactivity is required to establish fast reactor system with Trans-Uranium (TRU) fuel containing minor actinides. In addition, a Pu quantitation method with rapidity and accuracy is also necessary in a viewpoint of nuclear security. For these demands, a quantitative evaluation technique for nuclei concentration, thermal property and physical information of such fuel has to be developed. The present study focuses on the non-destructive imaging using pulsed neutrons. Experiments are carried out at Hokkaido University Neutron Source (HUNS) and a gas electron multiplier (GEM) is applied to obtain 2-D information of time-of-flight (TOF). To simulate a nuclear fuel pellet, a sample with equivalent thermal neutron cross-section to the enriched uranium fuel is prepared and the transmitted images of the simulated sample are acquired. Furthermore, a small piece of In, which simulates the Pu spot in the actual fuel, is inserted into the sample and the detectability of the small spot is discussed.
  • 3D nuclide imaging method using neutron and X-ray synergy imaging
    H. Hasemi, T. Kamiyama, H. Sato, K. Nakajima
    IEEE Nuclear Science Symposium Conference Record 2017 2017年 [査読無し][通常論文]
  • Neutron and X-ray transmission measurements using a Li-glass scintillation detector
    K. Y. Hara, H. Sato, T. Kamiyama, T. Shinohara
    IEEE Nuclear Science Symposium Conference Record 2017 2017年 [査読無し][通常論文]
  • H. Sato, K. Watanabe, K. Kiyokawa, R. Kiyanagi, K. Y. Hara, T. Kamiyama, M. Furusaka, T. Shinohara, Y. Kiyanagi
    NEUTRON IMAGING FOR APPLICATIONS IN INDUSTRY AND SCIENCE 88 322 - 330 2017年 [査読有り][通常論文]
     
    The RITS code is a unique and powerful tool for a whole Bragg-edge transmission spectrum fitting analysis. However, it has had two major problems. Therefore, we have proposed methods to overcome these problems. The first issue is the difference in the crystallite size values between the diffraction and the Bragg-edge analyses. We found the reason was a different definition of the crystal structure factor. It affects the crystallite size because the crystallite size is deduced from the primary extinction effect which depends on the crystal structure factor. As a result of algorithm change, crystallite sizes obtained by RITS drastically approached to crystallite sizes obtained by Rietveld analyses of diffraction data; from 155% to 110%. The second issue is correction of the effect of background neutrons scattered from a specimen. Through neutron transport simulation studies, we found that the background components consist of forward Bragg scattering, double backward Bragg scattering, and thermal diffuse scattering. RITS with the background correction function which was developed through the simulation studies could well reconstruct various simulated and experimental transmission spectra, but refined crystalline microstructural parameters were often distorted. Finally, it was recommended to reduce the background by improving experimental conditions. (C) 2017 The Authors. Published by Elsevier B.V.
  • Takashi Kamiyama, Kenji Iwase, Hirotaka Sato, Stefanus Harjo, Takayoshi Ito, Shin-ichi Takata, Kazuya Aizawa, Yoshiaki Kiyanagi
    Physics Procedia 88 50 - 57 2017年 [査読有り][通常論文]
     
    © 2017 The Authors. The spatial-dependent lattice spacing and microstructure of an α-iron plate with two notches was measured during tensile tests using a pulsed neutron transmission method to ascertain changes depending on the load. Changes in microstructural parameters such as macrostrain, microstrain, crystallite size and texture are interesting during the transition from the elastic to plastic deformation region, especially over a relatively wide field of view to see propagation of the change. The method has the capability to show changes in the position-dependence of microstructural information simultaneously over a wide area in the bulk material. Transmission spectra around the Bragg-edge regions of the neutron total cross section of α-iron were obtained, and the microstructural parameters, {110} plane spacing and its distribution, texture coefficient and crystallite size were analyzed. The spatial-dependent distributions (images) of these parameters show sample shape effects including strain concentration around the notches and the effect of dislocations being multiplied during the plastic deformation. The spatial dependence of the microstructural parameters visualized herein provides useful information for evaluating the inhomogeneous progress of deformation of the bulk engineering material.
  • Takashi Kamiyama, Yuki Narita, Hirotaka Sato, Masato Ohnuma, Yoshiaki Kiyanagi
    Physics Procedia 88 27 - 33 2017年 [査読有り][通常論文]
     
    Spectroscopic neutron Bragg-edge imaging was performed to study a lithium-ion battery (LIB) product. This non-destructive neutron imaging method is suitable for the evaluation of industrial products, but presents some difficulties for application to multicomponent products. The LIB includes a strong neutron scatterer and an absorber, and is thus a suitable test case for the use of neutron imaging in actual product measurement. In this study, we analyzed the variation of the graphite anode structure with changes in the battery charge level. The experiments were carried out using the compact neutron source at the Hokkaido University neutron source facility (HUNS). To eliminate the effect of scattered neutron contamination, we first determined the distance between the sample and detector required to reduce this effect to under 1 %. Using this separation, the charge level dependence of the anode structure was measured. The graphite {002} Bragg-edge could be recognized on the neutron transmission spectra. The Bragg-edge was shifted and broadened with increasing battery charge. The edge was consistent with the existence of multiple graphite structural stages. The layer spacing distribution images for different charge levels showed the inhomogeneous fluctuation on the LIB lattice plane. Based on the images the fraction of the graphite structural stages were analyzed. The ratio of each stage varied with the charge level, and the ideal intercalation structure, in which the graphite layers are stuffed with Li-ions, was found to be minor in the final charging state. (C) 2017 The Authors. Published by Elsevier B.V.
  • Hiroyuki Hasemi, Takashi Kamiyama, Hirotaka Sato, Koichi Kino, Yoshiaki Kiyanagi, Ken Nakajima
    Physics Procedia 88 369 - 375 2017年 [査読有り][通常論文]
     
    A compact accelerator-driven neutron source has some advantages over a large accelerator facility in terms of accessibility and usability. Recently, the project to develop a non-destructive testing system for nuclear fuels by neutron imaging using a compact accelerator-driven neutron source has launched in Japan. In this project, the traditional neutron radiography and temperature imaging by neutron resonance absorption spectroscopy (N-RAS) have been studied. From the viewpoint of L/D, a high-brightness moderator is desirable for the neutron imaging. In this study, we investigated the dependence of moderator size on the source brightness and the pulse characteristics of the neutron by simulation calculations to design the moderator for imaging using thermal and epithermal neutrons. As a result, the optimal size of the moderator for the neutron imaging was 6 similar to 7 cm in the energy region from 5 meV to 100 eV. (C) 2017 The Authors. Published by Elsevier B.V.
  • Hidenori Iwashita, Hirotaka Sato, Kaoru Arai, Takashi Kotanigawa, Koichi Kino, Takashi Kamiyama, Fujio Hiraga, Katsutoshi Koda, Michihiro Furusaka, Yoshiaki Kiyanagi
    IEEE TRANSACTIONS ON NUCLEAR SCIENCE 64 1 689 - 696 2017年01月 [査読有り][通常論文]
     
    The frequency of neutron-induced soft errors is increasing as devices become more integrated and miniaturized. Therefore, it has become more important recently to check reliability of a recovery system from the soft errors in network systems. For accelerated test, first we have examined possibility of the acceleration tests at a compact accelerator-driven neutron source, which is easy to adjust for soft-error tests and which also has low experimental costs. We selected the electron acceleratordriven neutron source at Hokkaido University as the compact accelerator-driven neutron source. We prepared a new targetreflector assembly composed of heavy metals to provide the fast neutrons, and conducted neutron-induced soft-error experiments on network equipments. As a result, we found that an accelerated rate of soft errors was about 106 times compared with that of the natural environment. We also investigated network equipment soft-error tolerance, fault detection and backup switching processes. Performing such testing before network equipment is actually deployed is critical for development of future network systems. Hence, the compact accelerator-based neutron source is a very useful tool.
  • T. Shinohara, T. Kai, K. Oikawa, M. Segawa, M. Harada, T. Nakatani, M. Ooi, K. Aizawa, H. Sato, T. Kamiyama, H. Yokota, T. Sera, K. Mochiki, Y. Kiyanagi
    Journal of Physics: Conference Series 746 1 12007  2016年10月10日 [査読有り][通常論文]
     
    A new pulsed-neutron instrument, named the Energy-Resolved Neutron Imaging System "RADEN", has been constructed at the beam line of BL22 in the Materials and Life Science Experimental Facility (MLF) of J-PARC. The primary purpose of this instrument is to perform energy-resolved neutron imaging experiments through the effective utilization of the pulsed nature of the neutron beam, making this the world's first instrument dedicated to pulsed neutron imaging experiments. RADEN was designed to cover a broad energy range: from cold neutrons with energy down to 1.05 meV (or wavelength up to 8.8 Å) with a good wavelength resolution of 0.20% to high-energy neutrons with energy of several tens keV (or wavelength of 10-3 Å). In addition, this instrument is intended to perform state-of-the-art neutron radiography and tomography experiments in Japan. Hence, a maximum beam size of 300 mm square and a high L/D value of up to 7500 are provided.
  • Sou Taminato, Masao Yonemura, Shinya Shiotani, Takashi Kamiyama, Shuki Torii, Miki Nagao, Yoshihisa Ishikawa, Kazuhiro Mori, Toshiharu Fukunaga, Yohei Onodera, Takahiro Naka, Makoto Morishima, Yoshio Ukyo, Dyah Sulistyanintyas Adipranoto, Hajime Arai, Yoshiharu Uchimoto, Zempachi Ogumi, Kota Suzuki, Masaaki Hirayama, Ryoji Kanno
    Scientific Reports 6 srep28843  2016年06月 [査読有り][通常論文]
     
    Among the energy storage devices for applications in electric vehicles and stationary uses, lithium batteries typically deliver high performance. However, there is still a missing link between the engineering developments for large-scale batteries and the fundamental science of each battery component. Elucidating reaction mechanisms under practical operation is crucial for future battery technology. Here, we report an operando diffraction technique that uses high-intensity neutrons to detect reactions in non-equilibrium states driven by high-current operation in commercial 18650 cells. The experimental system comprising a time-of-flight diffractometer with automated Rietveld analysis was developed to collect and analyse diffraction data produced by sequential charge and discharge processes. Furthermore, observations under high current drain revealed inhomogeneous reactions, a structural relaxation after discharge, and a shift in the lithium concentration ranges with cycling in the electrode matrix. The technique provides valuable information required for the development of advanced batteries.
  • T. Yokoo, K. Iwase, S. Itoh, T. Kamiyama, M. Arai, E. Akiba
    Journal of Neutron Research 18 2-3 37 - 44 2016年 [査読有り][通常論文]
     
    The effects of chemical binding energy on neutron total cross section were investigated by means of elastic and inelastic neutron scattering techniques. The metal hydrides Ti0.45Cr0.45Mo0.1D1.8 and Ti0.48Cr0.32V0.2D1.8 were used for the experiment, for which the expected effects can be detected via the observed dynamics of deuterium (D). The D local mode was observed by inelastic measurement at ∼100 meV for the first-order excitation, and higher order vibrational modes up to n = 4 were observed. Apart from these ordinary local vibrations, a specific energy potential â., ω 0 in the system was observed by elastic measurements as a recoil effect. It is found that the wave length dependence of the incoming neutron largely affects its intensity even for a coherent cross section. The effect should be taken into account particularly for the analysis with time-of-flight technique of pulse neutron diffraction.
  • A Prototype Detector Using the Neutron Image Intensifier and Multi-Anode Type Photomultiplier Tube for Pulsed Neutron Imaging
    H. Ishikawa, H. Sato, K. Y. Hara, T. Kamiyama
    JPS Conference Proceedings 11 050006  2016年 [査読有り][通常論文]
  • Neutron and X-ray imaging measurements by using a composite source system at Hokkaido University
    K. Y. Hara, H. Taira, H. Sato, T. Kamiyama, T. Shinohara
    Proceedings of the 2015 Symposium on Nuclear Data JAEA-Conf 2016-004 199 - 204 2016年 [査読有り][通常論文]
  • Measurement of the Cl-35(n,γ) reaction cross section in ANNRI at J-PARC
    K. Y. Hara, N. Fujii, T. Kamiyama, Y. Narita, H. Sato, S. Nakamura, Y. Toh
    Proceedings of the 2015 Symposium on Nuclear Data JAEA-Conf 2016-004 193 - 198 2016年 [査読有り][通常論文]
  • Construction of the energy-resolved neutron imaging system “RADEN” in J-PARC MLF
    T. Shinohara, T. Kai, K. Oikawa, M. Segawa, M. Harada, T. Nakatani, M. Ooi, M. Arai, H. Sato, T. Kamiyama, H. Yokota, T. Sera, K. Mochiki, Y. Kiyanagi
    Proceedings of the 21st Meeting of the International Collaboration on Advanced Neutron Sources (ICANS-XXI) JAEA-Conf 2015-002 KEK Proceedings 2015-7 292 - 297 2016年 [査読無し][通常論文]
  • Composite source system to measure a neutron and X-ray imaging at Hokkaido University
    K. Y. Hara, H. Taira, H. Sato, T. Kamiyama
    Proceedings of the 2014 Symposium on Nuclear Data JAEA-Conf 2015-003 203 - 206 2016年 [査読有り][通常論文]
  • Relation between Vickers Hardness and Bragg-edge Broadening in Quenched Steel Rods
    H. Sato, T. Sato, Y. Shiota, T. Kamiyama, M. Ohnuma, Y. Kiyanagi
    J-PARC Annual Report 2014 Volume 2: Materials and Life Science Experimental Facility (MLF Annual Report 2014) J-PARC 16-01 KEK Progress Report 2015-5 6 - 8 2016年 [査読無し][招待有り]
  • T. Hattori, A. Sano-Furukawa, H. Arima, K. Komatsu, A. Yamada, Y. Inamura, T. Nakatani, Y. Seto, T. Nagai, W. Utsumi, T. Iitaka, H. Kagi, Y. Katayama, T. Inoue, T. Otomo, K. Suzuya, T. Kamiyama, M. Arai, T. Yagi
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 780 55 - 67 2015年04月 [査読有り][通常論文]
     
    PLANET is a time (ToF) neutron beamline dedicated to high-pressure and high temperature experiments. The large six axis multi anvil high-pressure press designed for ToF neutron diffraction experiments enables routine data collection at high pressures and high temperatures up to 10 GPa and 2000 K, respectively. To obtain clean data, the beamline is equipped with the incident slits and receiving collimators to eliminate parasitic scattering from the high-pressure cell assembly. The high performance of the diffractometer for the resolution (Delta d/d similar to 0.6%) and the accessible d-spacing range (0.2-8.4 angstrom) together with low parasitic scattering characteristics enables precise structure determination of crystals and liquids under high pressure and temperature conditions. (C) 2015 Elsevier B.V. All rights reserved.
  • Tatsuya Katabuchi, Taihei Matsuhashi, Kazushi Terada, Masayuki Igashira, Motoharu Mizumoto, Kentaro Hirose, Atsushi Kimura, Nobuyuki Iwamoto, Kaoru Y. Hara, Hideo Harada, Jun-ichi Hori, Takashi Kamiyama, Koichi Kino, Fumito Kitatani, Yoshiaki Kiyanagi, Shoji Nakamura, Yosuke Toh
    PHYSICAL REVIEW C 91 3 037603.1-037603.5  2015年03月 [査読有り][通常論文]
     
    Time-of-flight spectra of the neutron capture events of Nd-142 were measured using a spallation neutron source at the Japan Proton Accelerator Research Complex. The first six resonances of Nd-142 reported in a previous work were not observed. The experimental results and cross-search of resonance energies in nuclear data libraries suggested that resonances of the impurity nuclide Pr-141 have been mistakenly assigned as Nd-142 in the previous experiment. To investigate the impact of the nonexistence of the resonances on the s-process nucleosynthesis model, the Maxwellian averaged neutron capture cross sections with and without the misassigned resonances were compared.
  • K. Kino, M. Yonemura, Y. Ishikawa, T. Kamiyama
    JPS Conference Series 8 031021  2015年02月 [査読有り][通常論文]
  • Kino Koichi, Yonemura Masao, Kiyanagi Yoshiaki, Ishikawa Yoshihisa, Parker Joseph. Don., Tanimori Toru, Kamiyama Takashi
    Physics Procedia 69 612 - 618 Elsevier BV 2015年 
    We obtain the transmission image of a commercial lithium ion (Li-ion) battery using a pulsed neutron beam at the beamline 09 of the Materials and Life Science Experimental Facility at the Japan Proton Accelerator Research Complex. The purpose of this study is to improve the performance of the Li-ion battery by nondestructive observation of its charging and discharging. The transmission images for three charge states (3.2 V, 3.7 V, and 4.2 V) reveal differences between these three states, which we attribute to electrolyte migration. The transmission spectra show Bragg edges originating from the electrodes, current collectors, and battery vessel. Although the battery as a whole has the expected relation between the charge accumulation and the quantity of lithium amounts in the positive and negative electrodes, a portion of the battery deviates from this relation, which may imply a position dependent charging in the battery.
  • Hirotaka Sato, Yoshinori Shiota, Takenao Shinohara, Takashi Kamiyama, Masato Ohnuma, Michihiro Furusaka, Yoshiaki Kiyanagi
    Physics Procedia 69 349 - 357 2015年01月01日 [査読有り][通常論文]
     
    © 2015 The Authors.The tensor CT algorithm for strain tomography using the Bragg-edge neutron transmission spectroscopy is presented. Crystal lattice strain is not scalar but is a tensorwhich changesdepending on the observation angle. Therefore, since traditional"scalar" CT algorithms cannot be applied to tomography of strain, the development of a "tensor" CT algorithm is needed. Aiming at further developments in the future, we first developed a ML-EM based versatile tensor tomography using ofa simple algorithm withsmall restriction. The basic concept is to simultaneously reconstruct multiple strain-tensor components (scalar quantities of normal strain and shear strain) existing at a certain position. In the actual CT image reconstruction, it is important to consider the angular dependence of each tensor component. Through the simulation studies on axially-symmetric and axially-asymmetric distributionscomposed of two strain components and experimental demonstration using the axially-symmetric VAMAS standard sample, we found some important points for strain-tensor tomography. The angle-dependent back-projection procedure of ML-EM is indispensable fortomography of each tensor component,butsuch function also causes animage distortion which can average each strain value along each strain direction. Also, we found that the optimization of the angle-dependent back-projection procedure is important for further improvements of the tensor CT algorithm.
  • Application of a Pulsed Neutron Transmission Method to a Cultural Heritage Study
    Y. Kiyanagi, Y. Shiota, N. Ayukawa, K. Kino, T. Sato, H. Sato, H. Hasemi, T. Kamiyama, S. Uno, F. Grazzi, A. Scherillo, A. S. Tremsin
    Restaurierung und Archäologie 8 85 - 91 2015年 [査読無し][通常論文]
  • Imaging of texture, crystallite size and strain in materials using accelerator based pulsed neutron sources
    Y. Kiyanagi, H. Sato, K. Iwase, T. Kamiyama
    Proceedings of IAEA Technical Meeting on Utilization of Accelerator Based Real Time Methods in Investigation of Materials with High Technological Importance IAEA Rad. Tech. Rep. 4 57 - 62 2015年 [査読無し][招待有り]
  • K. Mochiki, K. Ishizuka, K. Morikawa, T. Kamiyama, Y. Kiyanagi
    PROCEEDINGS OF THE 10TH WORLD CONFERENCE ON NEUTRON RADIOGRAPHY (WCNR-10) 69 143 - 151 2015年 [査読有り][通常論文]
     
    Pulsed neutron transmission spectroscopic radiography is an attractive new technique in energy-resolved neutron radiography. The imaging technique is based on the spectral analysis of neutrons through the time-of-flight (TOF) method. The neutron transmission spectrum that can be obtained using a time-resolved neutron imaging system includes the Bragg-scattering edges with crystallographic information and the transmission dips due to the resonance absorption of the nuclei. To obtain the neutron transmission spectrum with high-power neutron sources, we developed a new high-performance imaging system consisting of a neutron color image intensifier, photon image intensifier, high-resolution CMOS camera, and high-frame-rate camera. The system was used for experiments at the electron linac pulsed neutron source in Hokkaido University, and the targeted function was proved to be successful. (C) 2015 Published by Elsevier B.V.
  • Koichi Nittoh, Chikara Konagai, Mitsuru Yahagi, Yoshiaki Kiyanagi, Takashi Kamiyama
    PROCEEDINGS OF THE 10TH WORLD CONFERENCE ON NEUTRON RADIOGRAPHY (WCNR-10) 69 177 - 184 2015年 [査読有り][通常論文]
     
    We have been developing neutron color image intensifiers (hereafter abbreviated as NCIIs) for static neutron sources. With the recent progress of high power pulsed neutron sources, needs for energy selective neutron imaging are increasing. To fulfil such requirements, we have newly developed NCIIs having a high-speed blanking (gating) circuit and an output phosphor with shorter decay time. By combining these functions with a selection of input phosphor, measuring neutron energy ranges could be precisely selectable between cold and epithermal region, which extends the NCII utilization area to pulsed facilities. (C) 2015 The Authors. Published by Elsevier B.V.
  • Hirotaka Sato, Yoshinori Shiota, Takenao Shinohara, Takashi Kamiyama, Masato Ohnuma, Michihiro Furusaka, Yoshiaki Kiyanagi
    PROCEEDINGS OF THE 10TH WORLD CONFERENCE ON NEUTRON RADIOGRAPHY (WCNR-10) 69 349 - 357 2015年 [査読有り][通常論文]
     
    The tensor CT algorithm for strain tomography using the Bragg-edge neutron transmission spectroscopy is presented. Crystal lattice strain is not scalar but is a tensor which changes depending on the observation angle. Therefore, since traditional "scalar" CT algorithms cannot be applied to tomography of strain, the development of a "tensor" CT algorithm is needed. Aiming at further developments in the future, we first developed a ML-EM based versatile tensor tomography using of a simple algorithm with small restriction. The basic concept is to simultaneously reconstruct multiple strain-tensor components (scalar quantities of normal strain and shear strain) existing at a certain position. In the actual CT image reconstruction, it is important to consider the angular dependence of each tensor component. Through the simulation studies on axially-symmetric and axially-asymmetric distributions composed of two strain components and experimental demonstration using the axially-symmetric VAMAS standard sample, we found some important points for strain-tensor tomography. The angle-dependent back-projection procedure of ML-EM is indispensable for tomography of each tensor component, but such function also causes an image distortion which can average each strain value along each strain direction. Also, we found that the optimization of the angle-dependent back-projection procedure is important for further improvements of the tensor CT algorithm. (C) 2015 The Authors. Published by Elsevier B.V.
  • Hirotaka Sato, Tomoya Sato, Yoshinori Shiota, Takashi Kamiyama, Anton S. Tremsin, Masato Ohnuma, Yoshiaki Kiyanagi
    MATERIALS TRANSACTIONS 56 8 1147 - 1152 2015年 [査読有り][通常論文]
     
    The width of crystal lattice plane spacing (d-spacing) distribution related to microscopic-strain and crystallite size in a martensite phase in a 2 cm thick quenched-ferritic steel sample was quantitatively mapped in real space by a Bragg-edge broadening analysis of spectral data from a pulsed neutron transmission experiment. This analysis was performed under the condition that the instrumental resolution parameters, determined from the data of ferrite in the same sample without microscopic-strain and crystallite size effects, were unchanged over the sample area, and assuming that the d-spacing was distributed according to a Gaussian function in the martensite area. As a result, the full width at half maximum (FWHM) of the Gaussian d-spacing distribution in the martensite was extracted at each position in a sample. Consequently, it was found that the real-space distribution of the FWHM of the d-spacing distribution is closely correlated with a real-space distribution of the Vickers hardness that corresponds to the quantity of martensite. Furthermore, it was indicated that the Vickers hardness was proportional to the FWHM of the d-spacing distribution. The results suggest that it will be possible to measure the Vickers hardness in the martensite non-destructively by using the Bragg-edge neutron transmission method.
  • N. Wada, T. Shinohara, H. Sato, H. Hasemi, T. Kamiyama, Y. Kiyanagi
    PROCEEDINGS OF THE 10TH WORLD CONFERENCE ON NEUTRON RADIOGRAPHY (WCNR-10) 69 427 - 435 2015年 [査読有り][通常論文]
     
    Magnetic field imaging using polarized pulsed neutrons is attractive technique because it has the capability to visualize spatial distribution of the magnetic field. Analyzing neutron polarization change due to neutron spin rotation result under a magnetic field at each position makes it possible to obtain a spatial distribution of magnetic field. As previous work, One-dimensional polarization analysis setup using pulsed neutrons was established at J-PARC MLF and HUNS. In this paper, we have established three-dimensional polarization analysis setup to deduce a magnetic field strength and the direction precisely and, quantitatively evaluated averaged magnetic field strength and the direction inside a coil by comparing ones calculated by magnetic calculation using FEM and one measured by a hall probe. (C) 2015 The Authors. Published by Elsevier B.V.
  • Hasung Sim, Darren C. Peets, Sanghyun Lee, Seongsu Lee, T. Kamiyama, K. Ikeda, T. Otomo, S. W. Cheong, Je-Geun Park
    Physical Review B - Condensed Matter and Materials Physics 90 21 2014年12月31日 [査読有り][通常論文]
     
    Pb(Fe0.5Nb0.5)O3 (PFN), one of the few relaxor multiferroic systems, has a G-type antiferromagnetic transition at TN=143K and a ferroelectric transition at TC=385K. By using high-resolution neutron-diffraction experiments and a total scattering technique, we paint a comprehensive picture of the long- and short-range structures of PFN: (i) a clear sign of short-range structural correlation above TC, (ii) no sign of the negative thermal expansion behavior reported in a previous study, and (iii) clearest evidence thus far of magnetoelectric coupling below TN. We conclude that at the heart of the unusual relaxor multiferroic behavior lies the disorder between Fe3+ and Nb5+ atoms. We argue that this disorder gives rise to short-range structural correlations arising from O disorder in addition to Pb displacement.
  • Tatsuya Katabuchi, Taihei Matsuhashi, Kazushi Terada, Takuro Arai, Kazuyoshi Furutaka, Kaoru Y. Hara, Hideo Harada, Kentaro Hirose, Jun-ichi Hori, Masayuki Igashira, Takashi Kamiyama, Atsushi Kimura, Koichi Kino, Fumito Kitatani, Yoshiaki Kiyanagi, Mitsuo Koizumi, Motoharu Mizumoto, Shoji Nakamura, Masumi Oshima, Yosuke Toh
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 764 369 - 377 2014年11月 [査読有り][通常論文]
     
    A fast data acquisition method based on pulse-width analysis was developed for measuring neutron capture cross-sections using an NaI(Tl) detector. The new method was tested by detecting gamma-rays from standard gamma-ray sources and neutron-induced reactions. Non-linear relation between the gamma-ray energy and the pulse width of the detector output signal was studied. The neutron beam experiments were performed using a pulsed neutron beam from a spallation neutron source at the Japan Proton Accelerator Research Complex. Detector-deposited energy spectra were reconstructed from the pulse-width spectra using the parameterized relation between the pulse width and the gamma-ray energy. Time response properties of the pulse-width analysis method were compared with the traditional pulse-height analysis method. Detailed analysis of the experimental results demonstrated that the present method was more resistive to intense gamma-ray bursts from the spallation neutron source. (C) 2014 Elsevier B.V. All rights reserved.
  • S. Nakamura, A. Kimura, F. Kitatani, M. Ohta, K. Furutaka, S. Goko, K.Y. Hara, H. Harada, K. Hirose, T. Kin, M. Koizumi, M. Oshima, Y. Toh, K. Kino, F. Hiraga, T. Kamiyama, Y. Kiyanagi, T. Katabuchi, M. Mizumoto, M. Igashira, J. Hori, T. Fujii, S. Fukutani, K. Takamiya
    Nuclear Data Sheets 119 143 - 146 2014年05月 [査読有り][通常論文]
  • K. Kino, F. Hiraga, T. Kamiyama, Y. Kiyanagi, H. Harada, K. Y. Hara, K. Hirose, A. Kimura, F. Kitatani, S. Nakamura, M. Igashira, T. Katabuchi, M. Mizumoto, J. Hori
    NUCLEAR DATA SHEETS 119 140 - 142 2014年05月 [査読有り][通常論文]
     
    Primary gamma rays from the neutron capture resonances for Tc-99 were measured at the J-PARC/ANNRI. The transition pattern from the first resonance is similar to that from the capture reaction of thermal neutrons. On the other hand, transition patterns from the higher energy resonances are completely different, and there is no clear dependence on the spin-parities of the resonances.
  • K. Hirose, K. Furutaka, K. Y. Hara, H. Harada, J. Hori, M. Igashira, T. Kamiyama, T. Katabuchi, A. Kimura, T. Kin, K. Kino, F. Kitatani, Y. Kiyanagi, M. Koizumi, M. Mizumoto, S. Nakamura, M. Oshima, Y. Toh
    NUCLEAR DATA SHEETS 119 48 - 51 2014年05月 [査読有り][通常論文]
     
    The cross section of the Np-237(n,gamma) reaction has been measured at the Japan Proton Accelerator Research Complex (J-PARC). The NaI(Tl) spectrometer installed in the accurate neutron-nucleus reaction measurement instrument (ANNRI) was used for the measurement. The relative cross section was obtained using the neutron spectrum measured by the B-10(n, alpha(1)) reaction. The absolute value of the cross section was deduced by normalizing the relative cross section to the evaluated value in JENDL-4.0 at the first resonance.
  • J. Hori, H. Yashima, S. Nakamura, K. Furutaka, K. Y. Hara, H. Harada, K. Hirose, A. Kimura, F. Kitatani, M. Koizumi, M. Oshima, Y. Toh, M. Igashira, T. Katabuchi, M. Mizumoto, T. Kamiyama, K. Kino, Y. Kiyanagi
    NUCLEAR DATA SHEETS 119 128 - 131 2014年05月 [査読有り][通常論文]
     
    Neutron resonance capture gamma-ray measurements on Se-74 and Se-77 were performed with a 4 pi Ge spectrometer in the Accurate Neutron-Nucleus Reaction measurement Instrument (ANNRI) at the Japan Proton Accelerator Research Complex (J-PARC). The relative intensities of primary transitions were derived for the 27-eV resonance of Se-74 and the 113-, 212-, 291-, 342-, 690-and 864-eV resonances of Se-77, respectively. For the 27-eV resonance of Se-74, a strong transition to the 293-keV state was observed. Moreover, new resonances of Se-74 were found at 6, 123, 436 and 640 eV. It was confirmed that those resonances had originated in the neutron capture reaction of Se-74 by obtaining the TOF spectrum corresponding to the strong 287-keV ground-state transition gamma ray. As for Se-77, differences of the decay pattern were found between the resonances.
  • A. Kimura, K. Hirose, S. Nakamura, H. Harada, K. Y. Hara, J. Hori, M. Igashira, T. Kamiyama, T. Katabuchi, K. Kino, F. Kitatani, Y. Kiyanagi, M. Koizumi, M. Mizumoto, Y. Toh
    NUCLEAR DATA SHEETS 119 150 - 153 2014年05月 [査読有り][通常論文]
     
    The neutron-capture cross sections of Sn-112 and Sn-118 were measured by the time-of-flight method in the energy range from 10 meV to 2 keV with an array of germanium detectors in ANNRI at J-PARC. The preliminary results of the neutron-capture cross sections for Sn-112 and Sn-118 were obtained by normalizing the relative cross sections to the thermal cross section measured by Krane and to the evaluated value of JENDL-4.0 at the 47.05-eV resonance, respectively. Twelve new resonances for Sn-112 were observed, whereas the 21.02-, 40.38- and 166-eV resonances for Sn-112 and the 289-eV resonance for Sn-118 which are listed on JENDL-4.0 and/or ENDF/B VII.1 were not observed. The prompt gamma-ray distributions gated at the Sn-112 and Sn-118 resonances were obtained. Twenty-three new prompt gamma-ray emissions were observed in the Sn-112 (n,gamma) reactions.
  • A. Kimura, K. Hirose, S. Nakamura, H. Harada, K. Y. Hara, J. Hori, M. Igashira, T. Kamiyama, T. Katabuchi, K. Kino, F. Kitatani, Y. Kiyanagi, M. Koizumi, M. Mizumoto, Y. Toh
    NUCLEAR DATA SHEETS 119 150 - 153 2014年05月 [査読有り][通常論文]
     
    The neutron-capture cross sections of Sn-112 and Sn-118 were measured by the time-of-flight method in the energy range from 10 meV to 2 keV with an array of germanium detectors in ANNRI at J-PARC. The preliminary results of the neutron-capture cross sections for Sn-112 and Sn-118 were obtained by normalizing the relative cross sections to the thermal cross section measured by Krane and to the evaluated value of JENDL-4.0 at the 47.05-eV resonance, respectively. Twelve new resonances for Sn-112 were observed, whereas the 21.02-, 40.38- and 166-eV resonances for Sn-112 and the 289-eV resonance for Sn-118 which are listed on JENDL-4.0 and/or ENDF/B VII.1 were not observed. The prompt gamma-ray distributions gated at the Sn-112 and Sn-118 resonances were obtained. Twenty-three new prompt gamma-ray emissions were observed in the Sn-112 (n,gamma) reactions.
  • T. Katabuchi, T. Matsuhashi, K. Terada, M. Mizumoto, K. Hirose, A. Kimura, K. Furutaka, K. Y. Hara, H. Harada, J. Hori, M. Igashira, T. Kamiyama, F. Kitatani, K. Kino, Y. Kiyanagi, M. Koizumi, S. Nakamura, M. Oshima, Y. Toh
    NUCLEAR DATA SHEETS 119 398 - 400 2014年05月 [査読有り][通常論文]
     
    A fast data acquisition method based on pulse width analysis was developed for gamma-ray spectroscopy with an NaI(Tl) detector. The new method was tested in experiments with standard gamma-ray sources and pulsed neutron beam from a spallation neutron source. Pulse height spectra were successfully reconstructed from pulse width distribution by use of an energy calibration curve. The Au-197(n,gamma) Au-198 cross section was measured by this method to test the viability. The obtained experimental cross section showed a good agreement with a calculation using the resonance parameters of JENDL-4.0.
  • Hirotaka Sato, Yoshinori Shiota, Yoshikazu Todaka, Takenao Shinohara, Takashi Kamiyama, Masato Ohnuma, Michihiro Furusaka, Yoshiaki Kiyanagi
    Materials Science Forum 783-786 Pt.3 2109 - 2114 2014年05月 [査読無し][通常論文]
     
    Recent status of the technical development of the Bragg-edge neutron transmission imaging and its application to material science is presented. The neutron Bragg imaging has the advantages in measuring large area with reasonable spatial resolution, and it is a non-destructive method capable of looking inside a bulk material. Therefore, various information that are quite different from EBSD, synchrotron microtomography and X-ray/neutron scattering can be obtained by this method. We carried out quantitative imaging to obtain crystalline microstructural information in ultralow-carbon steels that received the high pressure torsion (HPT). The real-space distributions of texture and grain/crystallite size of HPTed steels of four torsion numbers were quantitatively visualized at once. As a result, we could deduce unique distributions of microstructural information depending on each torsion number, and correlated them with real-space distributions of the Vickers hardness. We also successfully developed a versatile strain tomography technique that can obtain tensor values for strain although traditional CT techniques can deal with only scalar values. The new CT algorithm, the tensor CT method, is based on our original algorithm called FBP-EM. The strain tensor tomography using FBP-EM was successfully applied for the experimental measured result obtained with the VAMAS neutron strain analysis international standard sample.
  • Activity of the photon induced activation experiments with 45 MeV electron linear accelerator at Hokkaido University
    A. Makinaga, H. Akimune, H. Otsu, T. Kamiyama, K. Kino, Y. Kiyanagi, G. N. Kim, M-W. Lee, S-G. Shin, M. Aikawa, K. Kato
    Proceedings of the 4th Asian Nuclear Reaction Database Development Workshop 20 - 23 2014年02月 [査読無し][通常論文]
  • Hirotaka Sato, Yoshinori Shiota, Yoshikazu Todaka, Takenao Shinohara, Takashi Kamiyama, Masato Ohnuma, Michihiro Furusaka, Yoshiaki Kiyanagi
    Advanced Materials Research 783-786 2109 - 2114 2014年01月01日 [査読無し][通常論文]
     
    Recent status of the technical development of the Bragg-edge neutron transmission imaging and its application to material science is presented. The neutron Bragg imaging has the advantages in measuring large area with reasonable spatial resolution, and it is a non-destructive method capable of looking inside a bulk material. Therefore, various information that are quite different from EBSD, synchrotron microtomography and X-ray/neutron scattering can be obtained by this method. We carried out quantitative imaging to obtain crystalline microstructural information in ultralow-carbon steels that received the high pressure torsion (HPT). The real-space distributions of texture and grain/crystallite size of HPTed steels of four torsion numbers were quantitatively visualized at once. As a result, we could deduce unique distributions of microstructural information depending on each torsion number, and correlated them with real-space distributions of the Vickers hardness. We also successfully developed a versatile strain tomography technique that can obtain tensor values for strain although traditional CT techniques can deal with only scalar values. The new CT algorithm, the tensor CT method, is based on our original algorithm called FBP-EM. The strain tensor tomography using FBP-EM was successfully applied for the experimental measured result obtained with the VAMAS neutron strain analysis international standard sample. © (2014) Trans Tech Publications, Switzerland.
  • Neutron Transmission Imaging
    Y. Kiyanagi, T. Kamiyama, H. Sato, T. Sato, T. Sakurai, S. Muto, S. Satoh, J. Haba, H. M. Shimizu, K. Hirota, Y. Yamagata, T. Tanimori, T. Nagae, S. Tasaki, K. Iwase
    KENS Report XIX/2012 53 - 59 2014年 [査読無し][招待有り]
  • High Pressure Torsion加工材の中性子ブラッグイメージング
    佐藤博隆, 戸高義一, 大沼正人, 篠原武尚, 加美山隆, 古坂道弘, 鬼柳善明
    日本鉄鋼協会C型研究会「新世代中性子源を利用した鉄鋼元素機能の解明」最終報告書 65 - 71 2014年 [査読無し][通常論文]
  • Development of Energy-Selective Neutron Imaging
    Y. Kiyanagi, H. Sato, Y. Shiota, T. Kamiyama, K. Iwase, S. Uno
    JPS Conference Proceedings 1 014008 2014年 [査読有り][通常論文]
  • Precise measurements of neutron capture cross sections for LLFPS and MAs
    S. Nakamura, A. Kimura, M. Ohta, T. Fujii, S. Fukutani, K. Furutaka, S. Goko, H. Harada, K. Hirose, J. Hori, M. Igashira, T. Kamiyama, T. Katabuchi, T. Kin, K. Kino, F. Kitatani, Y. Kiyanagi, M. Koizumi, M. Mizumoto, M. Oshima, M. Oshima, K. Takamiya, Y. Toh, H. Yamana
    Nuclear Back-end and Transmutation Technology for Waste Disposal 39 - 46 2014年 [査読有り][通常論文]
  • H. Ishikawa, T. Kamiyama, K. Nittoh, M. Yahagi, Y. Kiyanagi
    Physics Procedia 60 C 356 - 362 2014年 [査読有り][通常論文]
     
    A vacuum-tube type neutron image intensifier (NII), composed of Gd or 10B neutron convertor, is considered to have better spatial resolution and better detection efficiency compared with a traditional neutron scintilator. However, quantitative evaluation of difference in sensitivity among these imagers and difference in characteristics of the images between two NIIs has not been done since it needs measurements under the same irradiation condition. In this study we carried out radiography experiments at Hokkaido University Neutron Source (HUNS). Firstly, neutron radiography images were obtained by Gd-type NII, 10B-type NII, and the traditional neutron scintillator NE426 (ZnS:Ag/6LiF). Next, we evaluated the brightness values from these images. We also evaluated the contrast and the image quality from two NIIs. The brightness of Gd-type NII is 8.8 times and the 10B-type is 12.9 times higher than the NE426. There is contrast little difference between the two types of NII. The image quality of Gd-type is better than 10B-type when exposure time is short.
  • Quantitative Evaluation of Nuclide Density Distribution in a Substance by Neutron Resonance Absorption Transmission Method
    H. Hasemi, M. Harada, T. Kai, H. Sato, M. Ooi, M. Segawa, T. Shinohara, K. Kino, T. Kamiyama, Y. Kiyanagi
    Physics Procedia 60 244 - 253 2014年 [査読有り][通常論文]
  • Activity of Hokkaido University Neutron Source, HUNS
    M. Furusaka, H. Sato, T. Kamiyama, M. Ohnuma, Y. Kiyanagi
    Physics Procedia 60 167 - 174 2014年 [査読有り][通常論文]
  • T. Negishi, T. Shinohara, H. Sato, H. Hasemi, T. Kamiyama, Y. Kiyanagi
    Physics Procedia 60 C 91 - 96 2014年 [査読有り][通常論文]
     
    Imaging using polarized neutrons is one of the most attractive techniques in the neutron imaging field, because of its capability to visualize magnetic field inside materials or spaces by analyzing neutron polarization. An advanced method, which can quantify the magnetic field by combining the time-of-flight method with a polarization analysis of pulsed neutrons, has been developed at J-PARC. To introduce this method to the compact accelerator-driven neutron source, we have started the magnetic imaging experiments at Hokkaido University Neutron Source (HUNS). Using an experimental system consisting of a pair of magnetic super-mirrors as a polarizer and an analyzer, a spin flipper, and a two-dimensional neutron detector, we obtained the polarization of 90% at the wavelength over 6 Å. The first demonstration experiments were performed for coil samples. As a result, an oscillatory behaviour of polarization depending on the wavelength due to the neutron spin's Larmor precession was clearly observed.
  • Hirotaka Sato, Yoshinori Shiota, Takashi Kamiyama, Masato Ohnuma, Michihiro Furusaka, Yoshiaki Kiyanagi
    Physics Procedia 60 C 254 - 263 2014年 [査読有り][通常論文]
     
    Performances of the Bragg-edge transmission imaging at a compact accelerator-driven pulsed neutron source (pulsed CANS) are presented and evaluated. This technique is expected to be a new material analysis tool that can quantitatively visualize crystalline microstructural information inside a bulk material over large area with reasonable spatial resolution non-destructively. Therefore, it is expected that such new useful instrument should be installed at not only world-leading pulsed spallation neutron sources but also popular-priced CANS. For this reason, we evaluated and discussed the performances of the Bragg-edge transmission imaging at CANS for potential users. A coupled moderator is usually used to gain higher neutron flux at CANS. In such situation, quantitative imaging of crystal lattice strain and crystalline phase is not easy due to the low wavelength resolution. However, according to Monte-Carlo simulation calculation studies, it was found that an experimental setup using a decoupled moderator connected to a supermirror guide tube can solve this problem. On the other hand, in the situation using the coupled moderator, quantitative imaging of crystallographic texture and crystallite size can be carried out, but the Rietveldtype data analysis software, RITS, is necessary to evaluate reasonably low statistics data measured at CANS. Furthermore, it was found that reasonable results can be obtained by the Bragg-edge transmission imaging with the RITS code at CANS, which are consistent with results of a high-performance neutron diffraction experiment with the Rietveld analysis at a world-leading pulsed spallation neutron source. This means the Bragg-edge transmission imaging is expected to be one of the most efficient crystallographic/metallographic analysis tools for CANS.
  • S. Nagashima, Y. Shiota, H. Sato, T. Kamiyama, M. Ohnuma, Y. Kiyanagi
    Physics Procedia 60 C 327 - 331 2014年 [査読有り][通常論文]
     
    Japanese swords are peculiar ones forged by a unique method developed in Japan. The forging methods are different each other, depending on age and area. Therefore, the crystalline structure of a Japanese sword depends on the age and the area. In this study, we obtained crystallographic information of Japanese swords and investigated the difference in texture and crystallite size from Japanese swords by using the pulsed neutron transmission spectroscopy. The neutron transmission experiment was carried out at HUNS (Hokkaido University Neutron Source). The samples were two types of Japanese swords. We analyzed the position-dependent neutron transmission spectra and obtained quantitative microstructural information in two-dimensional real space. We found that there were differences of the microstructure between edge and back of each Japanese sword and the microstructure was different between two Japanese swords.
  • Kazuaki Kosako, Koji Oishi, Takashi Nakamura, Kouichi Sato, Takashi Kamiyama, Yoshiaki Kiyanagi
    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY 50 12 1188 - 1197 2013年12月 [査読有り][通常論文]
     
    Following the angular distribution measurements of bremsstrahlung photons and photoneutrons, we measured the distributions of photon and neutron dose rates in the iron and concrete assemblies using a copper target bombarded by 18, 28 and 38 MeV electrons at the electron linear accelerator (linac) of Hokkaido University. In this experiment, seven types of shielding assemblies of iron and concrete layers were used and the photon and neutron dosemeters were inserted into the assemblies to get the depth-dose distribution. The measured results were compared with the results calculated using the Monte Carlo code MCNP5 to verify the calculated results. The calculated results of the ambient dose equivalent rates were in agreement with the measured results within 30% accuracy. Since no work on the radiation behavior in the shielding wall of medical linac room has ever been reported, this work gives valuable benchmark data for the detailed shielding design with high accuracy.
  • 加美山隆, 佐藤博隆
    精密工学会誌 79 9 818 - 821 公益社団法人 精密工学会 2013年09月05日 [査読無し][通常論文]
  • Kazuya Aizawa, Wu Gong, Stefanus Harjo, Jun Abe, Takaaki Iwahashi, Takashi Kamiyama
    MATERIALS TRANSACTIONS 54 7 1083 - 1086 2013年07月
  • Wu Gong, Kazuya Aizawa, Stefanus Harjo, Jun Abe, Takaaki Iwahashi, Takashi Kamiyama
    MATERIALS TRANSACTIONS 54 6 974 - 976 2013年06月 
    Crystal structure, phase fraction and texture of long period stacking ordered structure (LPSO) phase in ternary Mg-Zn-Y alloys have been investigated by analysis on time-of-flight (TOF) neutron diffraction profiles using the Rietveld method. It has been shown that the LPSO phase in the alloys is 18R-type structure of space group P3(2)12 with a = 1.1182(0) nm and c = 4.7032(5) nm. The LPSO phase shows very strong [10 (1) over bar0] texture parallel to the growth direction in a directionally-solidified crystal alloy.
  • Masashi Takada, Kazuaki Kosako, Koji Oishi, Takashi Nakamura, Kouichi Sato, Takashi Kamiyama, Yoshiaki Kiyanagi
    Radiation Protection Dosimetry 153 3 369 - 383 2013年03月 [査読有り][通常論文]
     
    Angular distributions of absorbed dose of Bremsstrahlung photons and secondary electrons at a wide range of emission angles from 0 to 135°, were experimentally obtained using an ion chamber with a 0.6 cm3 air volume covered with or without a build-up cap. The Bremsstrahlung photons and electrons were produced by 18-, 28- and 38-MeV electron beams bombarding tungsten, copper, aluminium and carbon targets. The absorbed doses were also calculated from simulated photon and electron energy spectra by multiplying simulated response functions of the ion chambers, simulated with the MCNPX code. Calculated-to-experimental (C/E) dose ratios obtained are from 0.70 to 1.57 for high-Z targets of W and Cu, from 15 to 135° and the C/E range from 0.6 to 1.4 at 0° however, the values of C/E for low-Z targets of Al and C are from 0.5 to 1.8 from 0 to 135°. Angular distributions at the forward angles decrease with increasing angles on the other hand, the angular distributions at the backward angles depend on the target species. The dependences of absorbed doses on electron energy and target thickness were compared between the measured and simulated results. The attenuation profiles of absorbed doses of Bremsstrahlung beams at 0, 30 and 135 were also measured. © The Author 2012. Published by Oxford University Press. All rights reserved.
  • Kentaro Hirose, Kazuyoshi Furutaka, Kaoru Y. Hara, Hideo Harada, Atsushi Kimura, Tadahiro Kin, Fumito Kitatani, Mitsuo Koizumi, Shoji Nakamura, Masumi Oshima, Yosuke Toh, Masayuki Igashira, Tatsuya Katabuchi, Motoharu Mizumoto, Takashi Kamiyama, Koichi Kino, Yoshiaki Kiyanagi, Jun-ichi Hori
    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY 50 2 188 - 200 2013年02月 [査読有り][通常論文]
     
    The cross-section of the Np-237 (n, gamma) reaction has been measured in the energy range from 10 meV to 1 keV using the ANNRI-NaI(Tl) spectrometer at the Japan Proton Accelerator Research Complex (J-PARC). The cross-section was obtained relative to that of the B-10 (n, alpha(1)) reaction. The absolute value of the cross-section was deduced by normalizing the relative cross-section to the evaluated value of JENDL-4.0 at the first resonance. The thermal cross-section was obtained to be (176.7 +/- 0.5(sta) +/- 4.7(sys)) b. The Maxwellian-averaged cross-section for kT - 25.3 meV was derived as (174.6 +/- 0.6(sta) +/- 5.1(sys)) b by referring the cross-section below 10 meV from JENDL-4.0. These results lead to the Westcott's g-factor of 0.988 +/- 0.004(sta) +/- 0.009(sys).
  • H. Kira, Y. Sakaguchi, J. Suzuki, T. Oku, M. Nakamura, M. Arai, K. Kakurai, Y. Endo, Y. Arimoto, T. Ino, H. M. Shimizu, T. Kamiyama, K. Ohoyama, H. Hiraka, K. Tsutsumi, K. Yamada, L. J. Chang
    Physics Procedia 42 200 - 205 2013年 [査読有り][通常論文]
     
    A polarized 3He neutron spin filter requires a suitably homogeneous magnetic environment to avoid depolarization of 3He nuclear spin. In the present study, we discussed the required performance of the magnetic shield for an in-situ spin exchange optical pumping neutron spin filter system and designed a magnetic shield with T1mag > 100 h under a magnetic field of 3.5 mT perpendicular to the guide field. We then constructed the magnetic shield and confirmed its performance. Finally, we succeeded in developing a magnetic shield for a polarized 3He neutron spin filter system for J-PARC. © 2013 The Authors.
  • Construction of the Pulsed Neutron Imaging Beam Line at J-PARC
    T. Shinohara, T. Kai, K. Oikawa, M. Ooi, M. Harada, K. Sakai, T. Nakatani, M. Segawa, H. Iikura, T. Kamiyama, H. Sato, H. Yokota, T. Sera, Y. Saito, K. Mochiki, T. Sakai, M. Kureta, K. Aizawa, M. Arai, Y. Kiyanagi
    MLF Annual Report 2012 178 - 179 2013年 [査読無し][招待有り]
  • Evaluation of Manufacturing Process with Energy Selective Neutron Radiography
    H. Nose, T. Kamiyama, H. Sato, N. Kawaguchi, Y. Kiyanagi
    MLF Annual Report 2012 18 - 19 2013年 [査読無し][招待有り]
  • Determination of the Microstructural Properties of Four Ancient Japanese Steel Arrow Tips through Wavelength Resolved Neutron Transmission Analysis
    F. Grazzi, E. Barzagli, F. Salvemini, F. Civita, H. Sato, T. Shinohara, T. Kamiyama, Y. Kiyanagi, A. Tremsin, M. Zoppi
    MLF Annual Report 2012 14 - 15 2013年 [査読無し][招待有り]
  • Tetsuya Kai, Fujio Maekawa, Hidetoshi Oshita, Hirotaka Sato, Takenao Shinohara, Motoki Ooi, Masahide Harada, Shoji Uno, Toshiya Otomo, Takashi Kamiyama, Yoshiaki Kiyanagi
    7TH INTERNATIONAL TOPICAL MEETING ON NEUTRON RADIOGRAPHY (ITMNR-7) 43 111 - 120 2013年 [査読有り][通常論文]
     
    Neutron resonance absorption radiography is a technique to enhance neutron transmission images of specific nucleus at neutron resonance energies. Demonstration measurements by using a lithium-glass pixel type scintillator and a gas electron multiplication (GEM) neutron detector were carried out at NOBORU beam line in MLF/J-PARC for sodium, manganese, cobalt, copper, zinc, molybdenum, cadmium, indium, tantalum and gold. To discuss advantages of the resonance absorption radiography the mass attenuation coefficient at resonance energy of each element was compared to that at 25 meV. In addition a visibility index derived by a resonance peak cross section and a relative width (full width at half maximum divided by its resonance energy) was proposed to summarize visibility of the neutron resonance absorption radiography for natural elements. The values of visibility index and the resonance energy indicated that large advantages of the resonance absorption radiography were obtainable for the following elements: sodium (Na), manganese (Mn), cobalt (Co), rhodium (Rh), silver (Ag), cadmium (Cd), indium (In), xenon (Xe), cesium (Cs), samarium (Sm), europium (Eu), dysprosium (Dy), erbium (Er), thulium (Tm), hafnium (Hf), tantalum (Ta), tungsten (W), rhenium (Re), iridium (Ir) and gold (Au). (C) 2013 The Authors. Published by Elsevier B.V.
  • 上野 広樹, 加美山 隆, 鬼柳 善明
    日本原子力学会 年会・大会予稿集 2013 0 2013年 [査読無し][通常論文]
     
    加速器中性子源からのパルス中性子ビームにより測定可能なTOFスペクトルの高速イメージ撮影システムを開発している。<br>中性子イメージインテンシファイアより得られる可視光をミラーで反射しFOP上に結像させることでより安定的な撮像システムを構築した結果を報告する
  • H. Sato, T. Shinohara, R. Kiyanagi, K. Aizawa, M. Ooi, M. Harada, K. Oikawa, F. Maekawa, K. Iwase, T. Kamiyama, Y. Kiyanagi
    7TH INTERNATIONAL TOPICAL MEETING ON NEUTRON RADIOGRAPHY (ITMNR-7) 43 186 - 195 2013年 [査読有り][通常論文]
     
    The RITS code was developed for quantitative evaluation and visualization of crystalline structural information (e. g. crystallographic texture, preferred crystal orientation, crystallite block size and crystal lattice strain, etc.) of a material, analyzing position-dependent Bragg edge transmission spectra measured in an imaging experiment with pulsed neutrons. Originally, this code was neither able to deal with all the crystal structures that were classified into 230 types of space groups, nor applicable to materials composed of multi elements and multi crystalline phases. Therefore, we improved the RITS code for expansion of its capability, and then performed some demonstrations of simulation calculations and profile fitting analyses of experimental data. In this article, we present the new algorithm and the new functions of the improved RITS code, and the results of the simulation calculations and the experimental data analyses. (C) 2013 The Authors. Published by Elsevier B.V.
  • M. Ooi, M. Teshigawara, T. Kai, M. Harada, F. Maekawa, M. Futakawa, E. Hashimoto, M. Segawa, M. Kureta, A. Tremsin, T. Kamiyama, Y. Kiyanagi
    7TH INTERNATIONAL TOPICAL MEETING ON NEUTRON RADIOGRAPHY (ITMNR-7) 43 337 - 342 2013年 [査読有り][通常論文]
     
    The Japan Spallation Neutron Source (JSNS) at the Japan Proton Accelerator Research Complex (J-PARC) was developed as a 1-MW spallation neutron source. A Ag-In-Cd alloy was used as the decoupler material in two decoupled moderators. Although the Ag-In-Cd decoupler brings about superior neutronic performance, it has the disadvantage of high residual radioactivity. A Au-In-Cd alloy has been proposed as a solution to this problem. Recently, we successfully produced a ternary Au-In-Cd alloy. The alloy composition was 74.9 at% Au, 0.5 at% In, and 24.6 at% Cd. The distribution of the elements in the alloy was first determined by energy-dispersive X-ray (EDX) analysis. However, it was difficult to measure the In distribution by EDX because the amount of In is very small, and its spectrum is similar to that of Cd. Therefore, pulsed neutron imaging using both a time gated camera system and a multi-channel plate detector was performed to measure the elements in the Au-In-Cd alloy. The analysis was performed at the BL10 in the JSNS on samples of the Au-In-Cd alloy, an In foil, and two Au foils. With this technique, the distribution of Au, In, and Cd in the Au-In-Cd specimen was distinctly determined. (C) 2013 The Authors. Published by Elsevier B.V.
  • Y. Kiyanagi, T. Shinohara, T. Kai, T. Kamiyama, H. Sato, K. Kino, K. Aizawa, M. Arai, M. Harada, K. Sakai, K. Oikawa, M. Ooi, F. Maekawa, H. Iikura, T. Sakai, M. Matsubayashi, M. Segawa, M. Kureta
    Physics Procedia 43 92 - 99 2013年 [査読有り][通常論文]
     
    Pulsed neutron imaging methods provide information on crystallographic structure, magnetic field, elemental composition, hydrogen bound state and other material features. Such methods have been expected to be a powerful complement to the traditional imaging method. Data analysis codes, detectors and new applications are being developed in Japan, and a new imaging beam line is being constructed at J-PARC. Here, recent progress in Japanese research on pulsed neutron imaging is presented, and a design for construction of the new imaging beam line is reported. © 2013 The Authors.
  • Hiroyuki Hasemi, Takashi Kamiyama, Yoshiaki Kiyanagi
    7TH INTERNATIONAL TOPICAL MEETING ON NEUTRON RADIOGRAPHY (ITMNR-7) 43 86 - 91 2013年 [査読有り][通常論文]
     
    A small neutron facility based on a compact accelerator has some advantages over a large facility in terms of accessibility and usability. One of main objects of a compact accelerator neutron source is neutron imaging. Therefore, we performed an optimization study on a pulsed thermal neutron source and an epithermal one based on a compact accelerator in order to use it for thermal neutron imaging and resonance neutron imaging. We have carried out simulation calculations to evaluate the neutron intensity change depending on the moderator size taking into account spatial resolution. The intensities from a small moderator were higher than that from a larger one when compared at the same L/D. However, field of view (FOV) constrained the minimal moderator size. At L/D of 100 and FOV from 10 to 30 cm, the optimal moderator size giving the highest intensity was from 10 to 12 cm. (C) 2013 The Authors. Published by Elsevier B.V.
  • T. Katabuchi, K. Furutaka, Kaoru Hara, Hideo Harada, Kentaro Hirose, Jun-ich Hori, Masayuki Igashira, Takashi Kamiyama, Atsushi Kimura, Koich Kino, Fumito Kitatani, Y. Kiyanagi, Mitsuo Koizumi, Taihei Matsuhashi, Motoharu Mizumoto, Shoji Nakamura, Masumi Oshima, Kazushi Terada, Y. Toh
    2012年12月 [査読有り][通常論文]
  • Kimura Atsushi, Fujii Toshiyuki, Fukutani Satoshi, Furutaka Kazuyoshi, Goko Shinji, Hara Kaoru Y, Harada Hideo, Hirose Kentaro, Hori Jun-ichi, Igashira Masayuki, Kamiyama Takashi, Katabuchi Tatsuya, Kin Tadahiro, Kino Koichi, Kitatani Fumito, Kiyanagi Yoshiaki, Koizumi Mitsuo, Mizumoto Motoharu, Nakamura Shoji, Ohta Masayuki, Oshima Masumi, Takamiya Koichi, Toh Yosuke
    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY 49 11 1114  2012年11月 [査読有り][通常論文]
  • Atsushi Kimura, Toshiyuki Fujii, Satoshi Fukutani, Kazuyoshi Furutaka, Shinji Goko, Kaoru Y. Hara, Hideo Harada, Kentaro Hirose, Jun-ichi Hori, Masayuki Igashira, Takashi Kamiyama, Tatsuya Katabuchi, Tadahiro Kin, Koichi Kino, Fumito Kitatani, Yoshiaki Kiyanagi, Mitsuo Koizumi, Motoharu Mizumoto, Shoji Nakamura, Masayuki Ohta, Masumi Oshima, Koichi Takamiya, Yosuke Toh
    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY 49 11 1114 - 1114 2012年11月 [査読有り][通常論文]
  • Atsushi Kimura, Toshiyuki Fujii, Satoshi Fukutani, Kazuyoshi Furutaka, Shinji Goko, Kaoru Y. Hara, Hideo Harada, Kentaro Hirose, Jun-ichi Hori, Masayuki Igashira, Takashi Kamiyama, Tatsuya Katabuchi, Tadahiro Kin, Koichi Kino, Fumito Kitatani, Yoshiaki Kiyanagi, Mitsuo Koizumi, Motoharu Mizumoto, Shoji Nakamura, Masayuki Ohta, Masumi Oshima, Koichi Takamiya, Yosuke Toh
    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY 49 7 708 - 724 2012年07月 [査読有り][通常論文]
     
    The neutron neutron-capture cross cross-sections of Cm-244 and Cm-246 were measured by the time-of-flight method in the energy range of 1-300 300 eV with an array of large germanium detectors in the Accurate Neutron-Nucleus Reaction measurement InstrumentANNRI at Material and Life Science Experimental Facility (MLF) of the Japan Proton Accelerator Research ComplexJ-PARC/MLF. The Cm-244 resonances at around 7.7 and 16.8 8 eV and the Cm-246 resonances at around 4.3 and 15.3 3 eV were observed in the capture reactions for the first time. The uncertainties of the obtained cross cross-sections are 5.8% at the top of the first resonance of Cm-244 and 6.6% at that of Cm-246. The rResonance analyses were performed for low-energy ones using the code SAMMY. The prompt g-ray spectra of Cm-244 and Cm-246 were also obtained. Eight and five new prompt g-ray emissions were observed in the Cm-244(n, gamma) and Cm-246(n, gamma) reactions, respectively.
  • Kenji Iwase, Hirotaka Sato, Stefanus Harjo, Takashi Kamiyama, Takayoshi Ito, Shinichi Takata, Kazuya Aizawa, Yoshiaki Kiyanagi
    JOURNAL OF APPLIED CRYSTALLOGRAPHY 45 1 113 - 118 2012年02月 [査読有り][通常論文]
     
    In this study, the change in internal lattice strain in an iron plate during tensile deformation was investigated by performing in situ measurements under applied force. The lattice strain was evaluated by neutron diffraction and Bragg-edge transmission. The neutron diffraction results showed that the averaged 110 lattice strain along the direction perpendicular to the applied force was between -422 and -109 x 10(-6). The position dependence of the lattice strain and the change in the distribution of elastic strain in an iron plate with notches during tensile deformation was obtained by Bragg-edge transmission. It was also observed that, when the load increased over 30 kN, the area of plastic deformation increased around the positions of the notches.
  • Takashi Kamiyama, Hiroki Ueno, Yoshiaki Kiyanagi
    IEEE Nuclear Science Symposium Conference Record 167 - 170 2012年 [査読有り][通常論文]
     
    A neutron time-of-flight imaging device, which is composed by a neutron image intensifier and a high speed digital camera, was developed in our group. It successes to obtain the neutron spectrum under the 50 Hz repetition of the compact accelerator. The remained subject is on the focusing procedure for the camera. In this study we apply the improved optical system used the fiber optics plate for easy focusing and evaluate the total system. © 2012 IEEE.
  • Two-dimensional Imaging of Physical Information of Materials by using Pulsed Neutron Transmission Analysis
    Y. Kiyanagi, T. Kamiyama, H. Sato, N. Ayukawa, Y. Iwasaki, K. Iwase, K. Kino, F. Grazzi, A. Scherillo
    Proceedings of 20th Meeting of the International Collaboration on Advanced Neutron Sources (ICANS-XX) 2012年 [査読無し][通常論文]
  • Takashi Kamiyama, Hiroki Ueno, Yoshiaki Kiyanagi
    2012 IEEE NUCLEAR SCIENCE SYMPOSIUM AND MEDICAL IMAGING CONFERENCE RECORD (NSS/MIC) 167 - 170 2012年 [査読無し][通常論文]
     
    A neutron time-of-flight imaging device, which is composed by a neutron image intensifier and a high speed digital camera, was developed in our group. It successes to obtain the neutron spectrum under the 50 Hz repetition of the compact accelerator. The remained subject is on the focusing procedure for the camera. In this study we apply the improved optical system used the fiber optics plate for easy focusing and evaluate the total system.
  • Time-of-flight neutron radiography with a blanking-type image intensifier
    T. Kamiyama, Y. Kiyanagi
    Physics Procedia 26 231 - 237 2012年 [査読有り][通常論文]
  • Simulation calculations of transmissions for neutron total cross-section measurements of MAs and LLFPs by complementary use of a compact accelerator-driven neutron source
    K. Kino, F. Hiraga, T. Kamiyama, Y. Kiyanagi, M. Igashira
    Physics Procedia 26 243 - 248 2012年 [査読有り][通常論文]
  • Recent progress of pulsed neutron imaging in Japan
    Y. Kiyanagi, H. Sato, K. Iwase, T. Kamiyama
    Physics Procedia 26 219 - 222 2012年 [査読有り][通常論文]
  • Two-dimensional Neutron Detector with GEM and its Applications
    S. Uno, T. Uchida, M. Sekimoto, T. Murakami, K. Miyama, M. Shoji, E. Nakano, T. Koike, K. Morita, H. Satoh, T. Kamiyama, Y. Kiyanagi
    Physics Procedia 26 142 - 152 2012年 [査読有り][通常論文]
  • A new imaging method using pulsed neutron sources for visualizing structural and dynamical information
    Y. Kiyanagi, H. Sato, T. Kamiyama, T. Shinohara
    Journal of Physics: Conference Series 340 012010/1 - 012010/10 2012年 [査読有り][通常論文]
  • Motoki Ooi, Hirotatsu Ogawa, Takashi Kamiyama, Yoshiaki Kiyanagi
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 659 1 61 - 68 2011年12月 [査読有り][通常論文]
     
    Liquid hydrogen is a realistic cold moderator material for high-power spallation neutron sources. The neutronic performance of a hydrogen moderator depends on the ortho/para ratio of hydrogen, and thus experimental data are needed that will clarify the ortho/para ratio effects on neutronic performance. In this study, we measured the neutronic performance of a liquid hydrogen moderator at several para hydrogen concentrations. Our experiment was performed at the Hokkaido University 45 meV electron linac facility. The neutron energy spectra were measured by the time-of-flight method. Pulse shapes were measured by the Bragg scattering of a mica crystal. The neutron energy spectra change within 20%, depending on the para hydrogen concentrations. With increasing para hydrogen concentration, the pulse peak intensity increases and the pulse width becomes narrower. Furthermore, for a decoupled moderator, the pulse decay becomes faster with increasing para hydrogen concentration. From a viewpoint of the figure of merit (FOM = I/FWHM(2)) the para hydrogen moderator showed almost the same performance as that of the solid methane moderator, which is considered to be a high performance moderator for pulsed neutron source. (C) 2011 Elsevier B.V. All rights reserved.
  • Measurements of Neutron Capture Cross Sections at J-PARC/MLF/ANNRI (1) Measurements of Neutron Capture Cross Sections of Minor Actinides using a high intensity pulsed neutron source
    A. Kimura, T. Fujii, S. Fukutani, K. Furutaka, S. Goko, H. Harada, J. Hori, M. Igashira, T. Kamiyama, T. Katabuchi, T. Kin, K. Kino, F. Kitatani, Y. kiyanagi, M. Koizumi, M. Mizumoto, S. Nakamura, M. Ohta, M. Oshima, K. Takamiya, Y. Toh
    Proc. the 2010 Symposium on Nuclear Data, JAEA-Conf 2011-002, 23-28 2011年11月25日 [査読有り][通常論文]
  • Hirotaka Sato, Takashi Kamiyama, Kenji Iwase, Toru Ishigaki, Yoshiaki Kiyanagi
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 651 1 216 - 220 2011年09月 [査読有り][通常論文]
     
    A time-of-flight (TOF) spectroscopic neutron imaging at a pulsed neutron source is expected to be a new material analysis tool because this method can non-destructively investigate the spatial dependence of the crystallographic and metallographic information in a bulk material. For quantitative evaluation of such information, a spectral analysis code for the transmission data is necessary. Therefore, we have developed a Rietveld-like analysis code, RITS. Furthermore, we have applied the RITS code to evaluation of the position dependence of the crystal orientation anisotropy, the preferred orientation and the crystallite size of a welded a-iron plate, and we successfully obtained the information on the texture and the microstructure. However, the reliability of the values given by the RITS code has not been evaluated yet in detail. For this reason, we compared the parameters provided by the RITS code with the parameters obtained by the neutron TOF powder diffractometry and its Rietveld analysis. Both the RITS code and the Rietveld analysis software indicated values close to each other, but there were systematic differences on the preferred orientation and the crystallite size. (C) 2011 Elsevier B.V. All rights reserved.
  • Takashi Kamiyama, Daisuke Tsukui, Hirotaka Sato, Yoshiaki Kiyanagi
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 651 1 28 - 31 2011年09月 [査読有り][通常論文]
     
    Neutron resonance absorption spectroscopy (N-RAS) using a pulsed neutron source can be applied to time-of-flight (TOF) radiography, and the obtained parameters from the peak shape analysis can be reconstructed as the tomograms of nuclide distributions using computed tomography (CT). The problem is that the available spatial resolution is not sufficient for radiography imaging. In this study, we combined neutron and X-ray radiographies to improve the quantitative reconstruction of the neutron tomogram. The accelerator-based neutron source emits X-rays (or gamma-rays) at the same time the neutron pulse is emitted. We utilized the X-ray beam from the neutron source to obtain X-ray radiogram on the same beam line with neutron radiography and then reconstructed the neutron tomogram quantitatively with the help of a detailed sample internal structure obtained from the X-ray radiogram. We calculated the nuclide number density distribution tomogram using a statistical reconstruction procedure, which was easy to include in the structure model during the reconstruction. The obtained result of nuclide number density distribution showed good coincidence with the original object number density. (C) 2011 Elsevier B.V. All rights reserved.
  • Y. Kiyanagi, K. Kino, M. Furusaka, F. Hiraga, T. Kamiyama, K. Kato, M. Igashira, T. Katabuchi, M. Mizumoto, M. Oshima, H. Harada, J. Katakura, K. Furutaka, S. Goko, A. Kimura, T. Kin, F. Kitatani, M. Koizumi, S. Nakamura, M. Ohta, Y. Toh, T. Ohtsuki, K. Hirose, T. Fujii, J. Hori, K. Takamiya, S. Fukutani, M. Shibata, K. Yamada, H. Utsunomiya
    Journal of the Korean Physical Society 59 2 1781 - 1784 2011年08月 [査読有り][招待有り]
  • J. Hori, K. Furutaka, S. Goko, H. Harada, A. Kimura, T. Kin, F. Kitatani, M. Koizumi, S. Nakamura, M. Ohta, M. Oshima, Y. Toh, M. Igashira, T. Katabuchi, M. Mizumoto, T. Kamiyama, K. Kino, Y. Kiyanagi
    Journal of the Korean Physical Society 59 2 1777 - 1780 2011年08月 [査読有り][招待有り]
  • S. Nakamura, K. Furutaka, S. Goko, H. Harada, A. Kimura, T. Kin, F. Kitatani, M. Koizumi, M. Ohta, M. Oshima, Y. Toh, J. Hori, T. Fujita, S. Fukutani, K. Takamiya, M. Igashira, T. Katabuchi, M. Mizumoto, T. Kamiyama, K. Kino, Y. Kiyanagi
    Journal of the Korean Physical Society 59 2 1773 - 1776 2011年08月 [査読有り][招待有り]
  • T. Kin, K. Furutaka, S. Goko, H. Harada, A. Kimura, F. Kitatani, S. Nakamura, M. Ohta, M. Oshima, Y. Toh, J. Hori, M. Igashira, T. Katabuchi, M. Koizumi, M. Mizumoto, T. Kamiyama, K. Kino, Y. Kiyanagi
    Journal of the Korean Physical Society 59 2 1769 - 1772 2011年08月 [査読有り][招待有り]
  • Kenji Iwase, Hirotaka Sato, Kazuhiro Mori, Takashi Kamiyama, Toru Ishigaki, Yoshiaki Kiyanagi
    METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE 42A 8 2296 - 2300 2011年08月 [査読有り][招待有り]
     
    We investigated the nondestructive examination method by neutron scattering. A welded plate of SS304 (fcc) and iron (bcc) was investigated using neutron diffraction and the Bragg-edge transmission method. We tried to clear the positions of the welded area, SS304 phase, and iron phase and to determine the lattice spacing. The determined value of d (111) for SS304 is 2.07471(8) using neutron diffraction. With Bragg-edge transmission, it is possible to collect the information of a specimen as two-dimensional (2-D) images using a 2-D position sensitive detector at a pulse neutron source. The determined d (111) of SS304 phase indicates between 2.0745(8) and 2.0752(9) depending on the measurement points using Bragg-edge transmission. The same tendency was also seen in iron phase. The determined d (110) of the iron phase is 2.02802(1) using neutron diffraction. The determined d (110) of iron phase indicates between 2.0266(7) and 2.0321(13) using Bragg-edge transmission. The determined d using diffraction exists within that of Bragg-edge transmission. In order to clarify the position dependency of the phase and lattice spacing, the combined diffraction and Bragg-edge transmission is effective.
  • H. Kira, Y. Sakaguchi, T. Oku, J. Suzuki, M. Nakamura, M. Arai, K. Kakurai, Y. Endo, Y. Arimoto, T. Ino, H. M. Shimizu, T. Kamiyama, K. Tsutsumi, K. Ohoyama, H. Hiraka, K. Yamada, L. -J. Chang
    PHYSICA B-CONDENSED MATTER 406 12 2433 - 2435 2011年06月 [査読有り][通常論文]
     
    We have begun the development of an in-situ spin-exchange optical pumping (SEOP) system aiming to use it as a neutron spin filter for incident beam polarization at the Japan Proton Accelerator Research Complex (J-PARC). To use it, it is recommended that the optics be adjusted easily, have high stability, and have a small size. In this paper we improved our previous SEOP system aiming to use it in J-PARC and performed a neutron beam test at the JRR-3 NOP beamline to see the performance of the neutron spin filter (NSF). The polarization of the (3)He gas reached 73%. This paper gives the present status of the development of in-situ SEOP system in J-PARC. (C) 2010 Elsevier B.V. All rights reserved.
  • Y. Sakaguchi, H. Kira, T. Oku, T. Shinohara, J. Suzuki, K. Sakai, M. Nakamura, K. Suzuya, K. Aizawa, M. Arai, M. Takeda, S. Wakimoto, D. Yamazaki, S. Koizumi, Y. Endoh, L. J. Chang, Y. Arimoto, T. Ino, H. M. Shimizu, T. Kamiyama, K. Ohoyama, H. Hiraka, K. Tsutsumi, K. Yamada, K. Ohara, K. Kakurai
    PHYSICA B-CONDENSED MATTER 406 12 2443 - 2447 2011年06月 [査読有り][通常論文]
     
    Glass cells play an important role in polarized He-3 neutron spin filters. To evaluate the scattering and absorption contribution from glass cells during neutron scattering experiments, we measured small-angle scattering and neutron transmission in GE180 and other glasses. The small-angle neutron scattering measurements revealed that the glasses used for He-3 spin filters have acceptably lower scattering: d Sigma(Q)/d Omega=4-7 x 10(-4) cm(-1) at Q=0.03-0.12 angstrom(-1). The transmission measurement was performed at J-PARC. Neutron transmission of about 92% through empty GE180 cells was observed over a wide wavelength range 0.014-7.0 angstrom. To pursue the possibility of being a structural influence on He-3 spin relaxation in GE180 glass cells, we performed precise X-ray diffraction measurement using synchrotron radiation at Spring-8. From these measurements, a structural difference was observed among GE180 glasses with different thermal treatments. (C) 2010 Elsevier B.V. All rights reserved.
  • Y. Arimoto, T. Ino, H. M. Shimizu, T. Kamiyama, H. Kira, T. Oku, Y. Sakaguchi, K. Kakurai, K. Sakai, J. Suzuki, S. Koizumi, M. Arai, Y. Endo, M. Nakamura, T. Shinohara, M. Takeda, S. Wakimoto, D. Yamazaki, K. Ohoymama, H. Hiraka, K. Yamada, K. Tsutsumi, L. -J. Chang
    PHYSICA B-CONDENSED MATTER 406 12 2439 - 2442 2011年06月 [査読有り][通常論文]
     
    Polarized neutron spin filters are being developed based on spin-exchange optical pumping. In the present study a high-power diode laser (85 W) was used to excite Rb atoms and the laser linewidth was narrowed using an external cavity. The optics in the external cavity were designed by ray tracing. The ray-trace calculations demonstrated that a doublet lens in front of the laser eliminates aberrations. The maximum spectral peak height in the doublet optics was found to be 25% higher than for a singlet lens. (C) 2010 Elsevier B.V. All rights reserved.
  • Hirotaka Sato, Takashi Kamiyama, Yoshiaki Kiyanagi
    MATERIALS TRANSACTIONS 52 6 1294 - 1302 2011年06月 [査読有り][通常論文]
     
    Bragg-edge transmission imaging using a pulsed neutron source is expected to be a new method to investigate the crystallographic and metallographic structure of a material. This method has attracted the attention in the research field of material characterization for materials development and industrial applications because it non-destructively provides the images on the texture and the microstructure inside a material such as a thick steel bulk over the wide area of the material. For deducing such information from the Bragg-edge transmission spectrum, a data analysis code like a Rietveld analysis code for powder diffractometry is indispensable. So far, only the information on the crystallographic anisotropy has been deduced. However, this information is incomplete since both the preferred orientation and the crystallite size affect the Bragg-edge transmission spectrum. Therefore, we have developed a Rietveld-type analysis code, RITS, that allows us to obtain the information on preferred orientation and crystallite size at the same time. To examine the feasibility and the usefulness of the RITS code, we have analyzed the Bragg-edge transmission spectra of rolled and welded alpha-iron plates, and we have successfully obtained the preferred orientation data and the crystallite size data over the wide area of the bulk specimens. [doi:10.2320/matertrans.M2010328]
  • Y. Sakaguchi, H. Kira, T. Oku, T. Shinohara, J. Suzuki, K. Sakai, M. Nakamura, K. Suzuya, M. Arai, M. Takeda, S. Wakimoto, D. Yamazaki, S. Koizumi, Y. Endoh, K. Kakurai, Y. Arimoto, T. Ino, H. M. Shimizu, T. Kamiyama, K. Ohoyama, H. Hiraka, K. Tsutsumi, K. Yamada, L. J. Chang
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 634 S122 - S125 2011年04月 [査読有り][通常論文]
     
    Polarized He-3 neutron spin filters are suitable devices for polarizing neutrons at spallation neutron facilities because of the wide coverage in energy range and the large solid-angles. The glass cell plays an important role in the He-3 spin filters. In order to get good quality of glass cells, the investigation on the microscopic structure would be helpful. In this paper, we report on the results of X-ray diffraction for several glasses. We observed a correlation between the position of the first peak and the helium permeation velocity. We also observed a small difference in the diffraction curve among GE180 glasses with different thermal treatment. Desirable structure for He-3 spin filters is discussed. (C) 2010 Elsevier B.V. All rights reserved.
  • Yumiko Nakamura, Takashi Kamiyama, Etsuo Akiba
    MATERIALS TRANSACTIONS 52 4 591 - 594 2011年04月 [査読有り][通常論文]
     
    Hydrogen vibrational excitation was studied for CaF2-type metal hydrides synthesized from Ti-based BCC solid solution alloys using inelastic incoherent neutron scattering (IINS). Ti1.0V1.1Mn0.9H4.5 and Ti0.7V1.2Cr1.1H4.8 showed IINS spectra similar to that reported for TiH2. The first three peaks were isolated but the higher excitation peaks were not clear. Analysis of the spectra using curve-fitting with Gauss functions revealed that the hydrogen vibration of Ti1.0V1.1Mn0.9H4.5 is harmonic but that of the Ti0.7V1.2Cr1.1H4.8 is deviated from harmonic, which reflects a trumpet-type potential. The relation between metal-hydrogen distance and vibrational excitation energy for the above two hydrides and Ti1.1Cr1.4Mo0.3H similar to 5 was compared with a series of CaF2-type binary metal hydrides. All the hydrides of the Ti-based alloys had lower vibrational excitation energies than the binary metal hydrides for the corresponding metal-hydrogen distances. [doi:10.2320/matertrans.MA201014]
  • H. Kira, Y. Sakaguchi, T. Oku, J. Suzuki, M. Nakamura, M. Arai, Y. Endoh, L. J. Chang, K. Kakurai, Y. Arimoto, T. Ino, H. M. Shimizu, T. Kamiyama, K. Ohoyama, H. Hiraka, K. Tsutsumi, K. Yamada
    JCNS WORKSHOP ON MODERN TRENDS IN PRODUCTION AND APPLICATIONS OF POLARIZED 3HE 294 012014/1 - 5 2011年 [査読有り][通常論文]
     
    We launched the polarized He-3 neutron spin filters (NSF) project in order to provide neutron polarization for the pulsed neutron beams in Japan. We adopted the in-situ spin exchange optical pumping (SEOP) technique to polarize the nuclear spin of He-3 atoms because it has some advantages for our applications. The overall system size is compact and it avoids the problem of the time decay of nuclear spin of He-3 thus suppressing the costs of maintenance and providing other advantages [1, 2] with respect to data analysis and quality. In this paper, we performed pulsed neutron beam tests of our compact in-situ SEOP NSF system at the BL10 beamline in the Materials and Life Science Experimental Facility of the Japan Proton Accelerator Research Complex (J-PARC). The polarization of the He-3 gas reached was 73 % and a pump-up time constant of 9.5 h was observed. This paper is a status report about the development of in-situ SEOP NSF system for the pulsed beam at J-PARC.
  • Y. Sakaguchi, H. Kira, T. Oku, T. Shinohara, J. Suzuki, K. Sakai, M. Nakamura, K. Aizawa, M. Arai, Y. Noda, S. Koizumi, M. Takeda, Y. Endoh, L. J. Chang, Y. Arimoto, T. Ino, H. M. Shimizu, T. Kamiyama, K. Ohoyama, H. Hiraka, K. Tsutsumi, K. Yamada, K. Kakurai
    JCNS WORKSHOP ON MODERN TRENDS IN PRODUCTION AND APPLICATIONS OF POLARIZED 3HE 294 012017/1 - 7 2011年 [査読有り][通常論文]
     
    A polarized He-3 neutron spin filter has been applied to polarization analysis on the small-angle neutron scattering spectrometer SANS-J-II at JRR-3. Measurements were taken on silver behenate, which has several coherent peaks in the small-angle region with a background of spin incoherent hydrogen scattering. Here we demonstrate that the coherent and spin incoherent scattering were successfully separated by the polarization analysis using the He-3 spin filter on the instrument.
  • Y. Sakaguchi, H. Kira, T. Oku, T. Shinohara, J. Suzuki, K. Sakai, M. Nakamura, K. Suzuya, K. Aizawa, M. Arai, M. Takeda, Y. Endoh, L. J. Chang, Y. Arimoto, T. Ino, H. M. Shimizu, T. Kamiyama, K. Ohoyama, H. Hiraka, K. Tsutsumi, K. Yamada, K. Ohara, K. Kakurai
    JCNS WORKSHOP ON MODERN TRENDS IN PRODUCTION AND APPLICATIONS OF POLARIZED 3HE 294 012009/1 - 7 2011年 [査読有り][通常論文]
     
    In spin-exchange optical pumping, there is unknown excess relaxation, called the X-factor, that limits attainable He-3 polarization. It is known that the X-factor depends on the glass containers. Hence, it is expected that there are cell-to-cell variations in microscopic structure among the cells and that these variations affect the attainable He-3 polarization. However, microscopic structure of the glasses for He-3 neutron spin filters has not been clarified yet. In this paper, we have performed precise X-ray diffraction measurements for the glasses at SPring-8 using synchrotron radiation. The structural differences are observed between several types of glasses, and also, between the GE180 glass pieces with different thermal treatment. Based on the results, the structural influence on the performance of He-3 neutron spin filters is discussed.
  • Koichi Kino, Kazuhiro Mori, Masao Yonemura, Shuki Torii, Masayoshi Kawai, Toshiharu Fukunaga, Takashi Kamiyama
    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 80 Suppl. B SB001  2011年01月 [査読有り][通常論文]
     
    An idea of the air scattering chamber was adopted for the multipurpose bank in the powder diffractometer SPICA at J-PARC/MLF. To design the air scattering chamber, the loss of neutrons in the chamber and the contamination of scattered neutrons by air were studied by numerical calculation and simulation. The loss is 6 to 11% although it is almost double compared to that of a conventional vacuum scattering chamber. The contamination of the scattered neutrons by air is less than 1% by placing blades made of B4C resin in the chamber as many as possible. The contamination is seen on the TOF spectrum as continuous backgrounds between diffraction peaks. We regard the air scattering chamber with the blades is acceptable for the multipurpose bank of SPICA.
  • M. Yamashita, K. Mochiki, T. Kamiyama, Y. Kiyanagi
    2011 IEEE NUCLEAR SCIENCE SYMPOSIUM AND MEDICAL IMAGING CONFERENCE (NSS/MIC) 370 - 372 2011年 [査読有り][通常論文]
     
    As a new technique the pulsed neutron transmission spectroscopic radiography is auractive in the research fields of energy-resolved neutron radiography. The imaging technique is based on the energy-analysis of neutrons by time-of-flight (TOF) method. The neutron transmission spectrum includes the Bragg scattering edges with the crystallographic structure and texture information. We developed a high performance high-frame-rate camera for this neutron imaging at an electron Linac pulsed neutron source in Hokkaido University.
  • Measurements of Neutron Capture Cross Sections at J-PARC/MLF/ANNRI (2) Measurements of Neutron Capture Cross Sections of Long-Lived Fission Products using a high intensity pulsed neutron source
    J. Hori, T. Fujii, S. Fukutani, M. Furusaka, K. Furutaka, S. Goko, H. Harada, F. Hiraga, M. Igashira, T. Kamiyama, T. Katabuchi, A. Kimura, T. Kin, K. Kino, F. Kitatani, Y. Kiyanagi, M. Koizumi, M. Mizumoto, S. Nakamura, M. Ohta, M. Oshima, K. Takamiya, Y. Toh
    Proc. the 2010 Symposium on Nuclear Data, JAEA-Conf 002 29 - 34 2011年 [査読無し][通常論文]
  • Pulsed Neutron Imaging on Quenched Iron Rods and Cement Pastes
    T. Kamiyama, H. Sato, R. Takamori, N. Ayukawa, Y. Iwasaki, A. S. Tremsin, Y. Kiyanagi
    MLF Annual Report 2010, J-PARC Center, J-PARC 11-03 (KEK Progress Report 2011-4) 115 - 117 2011年 [査読無し][通常論文]
  • Shinji Goko, Atsushi Kimura, Hideo Harada, Masumi Oshima, Masayuki Ohta, Kazuyoshi Furutaka, Tadahiro Kin, Fumito Kitatani, Mitsuo Koizumi, Shoji Nakamura, Yosuke Toh, Masayuki Igashira, Tatsuya Katabuchi, Motoharu Mizumoto, Yoshiaki Kiyanagi, Koichi Kino, Michihiro Furusaka, Fujio Hiraga, Takashi Kamiyama, Jun-ichi Hori, Toshiyuki Fujii, Satoshi Fukutani, Koichi Takamiya
    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY 47 12 1097 - 1100 2010年12月 [査読有り][通常論文]
  • H. Sato, O. Takada, S. Satoh, T. Kamiyama, Y. Kiyanagi
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 623 1 597 - 599 2010年11月 [査読有り][通常論文]
     
    A spectroscopic neutron imaging is attractive in the research field of energy-selective neutron radiography. Imaging using the time-of-flight (TOF) method at a pulsed neutron source is very suitable for such spectroscopic measurements. We developed new two-dimensional position sensitive neutron detectors (2D-PSNDs) aiming at high detection efficiency, high counting rate and high time resolution which are the most important 2D-PSND performances for the spectroscopic imaging. These detectors consist of independent (6)Li-glass (Ce) scintillator pixels, and have been used in various pulsed neutron transmission experiments. As a result, we have succeeded in developing various new imaging techniques; crystallographic, nuclide-selective and thermographic imaging. (C) 2010 Elsevier B.V. All rights reserved.
  • Fujio Maekawa, Masahide Harada, Kenichi Oikawa, Makoto Teshigawara, Tetsuya Kai, Shin-ichiro Meigo, Motoki Ooi, Shinichi Sakamoto, Hiroshi Takada, Masatoshi Futakawa, Takashi Kato, Yujiro Ikeda, Noboru Watanabe, Takashi Kamiyama, Syuki Torii, Ryoichi Kajimoto, Mitsutaka Nakamura
    Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 620 2-3 159 - 165 2010年08月
  • Osamu Takada, Takashi Kamiyama, Yoshiaki Kiyanagi
    JOURNAL OF NUCLEAR MATERIALS 398 1-3 129 - 131 2010年03月 [査読有り][通常論文]
     
    LBE (Lead Bismuth Eutectic), which is a candidate for spallation targets, has some problems. One of them is expansion after solidification, which may bring about serious damage of an LBE loop. Two solid phases of beta-phase (inter-metallic compound) and gamma-phase (solid solution of Pb in Bi) appear in LBE, and it was reported that an increase of the gamma-phase observed by X-ray corresponds to the volume expansion of LBE. We performed neutron spectroscopic transmission experiments using a pulsed neutron source in order to observe crystal transformation depending on the position and time for slow and rapid cooling LBE samples. It was found that the crystal structure of the slow cooling LBE varied depending on position while it was rather homogeneous for the rapid cooling sample. The re-crystallization of the gamma-phase was more clearly observed for the rapid cooling sample than the slow one. We were able to obtain information of re-crystallization over the whole volume of the samples. (C) 2009 Elsevier B.V. All rights reserved.
  • Kazuaki Kosako, Koji Oishi, Takashi Nakamura, Masashi Takada, Kouichi Sato, Takashi Kamiyama, Yoshiaki Kiyanagi
    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY 47 3 286 - 294 2010年03月 [査読有り][通常論文]
     
    We measured the angular distribution of bremsstrahlung photons between 0 and 120 degrees from copper and tungsten targets bombarded by 18, 28, and 38 MeV electrons at the electron linac of Hokkaido University. Activation detectors and two types of dosimeters were applied for the measurement. The measured results were compared with those calculated with the Monte Carlo code MCNP5 to verify the calculated results. The calculated results of both the reaction rates and ambient dose equivalent rates gave good agreement with the measured ones in the case of 18 MeV electrons. A good agreement between the measurement and calculation was also observed for relative angular distributions of dose rates from 38 MeV electrons; however, the calculation overestimated the measured data by a factor of 1.2 to 2.0. To achieve further accuracy of calculation, improvement of photonuclear reaction data and absorbed dose measurement are necessary for bremsstrahlung radiation dosimetry.
  • Stefanus Harjo, Kazuya Aizawa, Takayoshi Ito, Hiroshi Arima, Jun Abe, Atsushi Moriai, Kaoru Sakasai, Tatsuya Nakamura, Takeshi Nakatani, Takaaki Iwahashi, Takashi Kamiyama
    Materials Science Forum 652 99 - 104 2010年 
    The construction of The Engineering Materials Diffractometer, TAKUMI of J-PARC has been finished on March 2009, and the commissioning has been started from September 2008 being parallel with the final stage of the construction. In the commissioning, after checking the validity and the stability of the detectors and the data acquisition system, powder diffraction data of an austenitic steel alloy with 10 mm diameter without beam collimation (high intensity mode) was measured, and the resolution Δd/d of 0.4% was confirmed, as designed. Further commissioning was done also with 2 mm diameter of annealed piano wire with combination of beam collimation (high resolution mode), and the resolution Δd/d of less than 0.2% was confirmed to be achieved. TAKUMI adopted an event mode data recording method. It was found that the recording method is very useful to manipulate data as we like, for instance, detector range, time of flight binning width and time resolved data, even theexperiment has been finished. © (2010) Trans Tech Publications.
  • H. Sato, O. Takada, K. Iwase, T. Kamiyama, Y. Kiyanagi
    INTERNATIONAL CONFERENCE ON NEUTRON SCATTERING 2009 251 2010年 [査読有り][通常論文]
     
    A pulsed neutron transmission coupled with a two-dimensional position sensitive neutron detector gives a time-of-flight spectrum at each pixel of the detector, which depends on the total cross-sections of materials. In order to extract quantitative information of the preferred orientation included in the Bragg scattering total cross-section data, a spectral analysis software for the 2D imaging has been developed, and the transmission data of an unbent iron plate were analyzed. The 2D images with respect to the preferred orientation were successfully obtained, and the effectiveness of spectroscopic neutron transmission imaging was indicated.
  • Design Study of a Spectroscopic Imaging Line at J-PARC MLF
    Y. Kiyanagi, T. Kamiyama, H. Sato, T. Shinohara, S. Takata, K. Aizawa, M. Arai, T. Kai, M. Harada, K. Sakai, K. Oikawa, M. Ooi, F. Maekawa, H. Hayashida, T. Sakai, M. Matsubayashi, M. Segawa, M. Kureta
    Proceedings of 19th Meeting of the International Collaboration on Advanced Neutron Sources (ICANS-XIX) 2010年 [査読無し][通常論文]
  • Neutron transmission spectroscopic imaging for analysis of texture in materials for industrial use
    Y. Kiyanagi, H. Sato, O. Takada, N. Ayukawa, T. Kamiyama
    Nuclear Research Applications and Utilization of Accelerators, IAEA Proceedings CD Series IAEA-I3-CN-173 1 - 10 2010年 [査読無し][通常論文]
  • H. Sato, O. Takada, K. Iwase, T. Kamiyama, Y. Kiyanagi
    Journal of Physics: Conference Series 251 1 012070  2010年 [査読有り][通常論文]
     
    A pulsed neutron transmission coupled with a two-dimensional position sensitive neutron detector gives a time-of-flight spectrum at each pixel of the detector, which depends on the total cross-sections of materials. In order to extract quantitative information of the preferred orientation included in the Bragg scattering total cross-section data, a spectral analysis software for the 2D imaging has been developed, and the transmission data of an unbent iron plate were analyzed. The 2D images with respect to the preferred orientation were successfully obtained, and the effectiveness of spectroscopic neutron transmission imaging was indicated. © 2010 IOP Publishing Ltd.
  • A. Makinaga, K. Kato, T. Kamiyama, K. Yamamoto
    10TH INTERNATIONAL SYMPOSIUM ON ORIGIN OF MATTER AND EVOLUTION OF GALAXIES 1269 394 - + 2010年 [査読無し][通常論文]
     
    Nuclear reaction rate for photodisintegration and their inverse, charged particle and neutron capture reactions, are important input quantities for stellar nucleosynthesis. In order to evaluate reaction rates precisely, both nuclear experiment and model prediction are needed. Recently, real photon-beam is used as powerful tools for astrophysics. In this work, current status of the development of a new bremsstrahlung gamma-ray source with the electron linear accelerator at Hokkaido University will be presented.
  • KOICHI KINO, MICHIHIRO FURUSAKA, FUJIO HIRAGA, TAKASHI KAMIYAMA, YOSHIAKI KIYANAGI, KAZUYOSHI FURUTAKA, SHINJI GOKO, HIDEO HARADA, ATSUSHI KIMURA, TADAHIRO KIN, FUMITO KITATANI, MITSUO KOIZUMI, SHOJI NAKAMURA, MASAYUKI OHTA, MASUMI OSHIMA, YOSUKE TOH, MASAYUKI IGASHIRA, TATSUYA KATABUCHI, MOTOHARU MIZUMOTO, Toshiyuki Fujii, Jun-ichi Hori, Koichi Takamiya
    Bulletin of the American Physical Society Vol. 54 No. 10 p. 190  2009年10月 [査読有り][通常論文]
  • T. Kamiyama, N. Miyamoto, S. Tomioka, T. Kozaki
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 605 1-2 91 - 94 2009年06月 [査読有り][通常論文]
     
    Neutron resonance absorption spectroscopy (N-RAS) with a pulsed neutron source can distinguish the dynamics of individual nuclides having resonance peaks on epithermal neutron region. The analyzed internal information of nuclide presence and its effective temperature can be reconstructed as distributions over the object cross-section using computed tomography (CT). Because some of the resonance absorption cross-sections have very large values, N-RAS could match the small neutron pulsed source by its high sensitivity. In this study, we have constructed a new instrument of N-RAS on a compact electron linac neutron source. Resonance absorption measurements and CT imaging with the instrument have succeeded for some kinds of nuclide. (C) 2009 Elsevier B.V. All rights reserved.
  • Hirotaka Sato, Takashi Kamiyama, Yoshiaki Kiyanagi
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 605 1-2 36 - 39 2009年06月 [査読有り][通常論文]
     
    We are developing the energy-selective neutron radiography and tomography technique by using the pulsed neutron source and the time-of-flight (TOF) spectroscopy. Neutron resonance absorption spectroscopy with computer tomography, N-RAS/CT, can non-destructively give the tomographic image indicating material information such as nuclide, density and temperature inside the object. The primary N-RAS/CT was performed by detecting prompt gamma-rays emitted from nuclei absorbing neutrons as a function of neutron TOF In this case, position dependent data need to be obtained by scanning the object with a moving slit. On the other hand, in this paper, we propose a new N-RAS/CT method using neutron transmission spectroscopy combined with 2-dimensional position sensitive neutron detector (2d-PSND), which is applicable to TOF measurement. The greatest feature of this method is shorter measurement time than the previous one because 2d-PSND can obtain spatial information at once. For this reason, we carried out the new N-RAS/CT experiment to examine its feasibility at the pulsed neutron facility based on the small accelerator. (C) 2009 Elsevier B.V. All rights reserved.
  • K. Iwase, K. Sakuma, T. Kamiyama, Y. Kiyanagi
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 605 1-2 1 - 4 2009年06月 [査読有り][通常論文]
     
    The residual strain and the total cross-section in Fe plate was investigated by a Bragg-edge transmission method. The experiments were performed at the position of the time-of-flight diffractometer at KENS, Sirius. The (Delta d/d) reached about 0.1%. The high counting rate and high efficiency pixel type 2d-detector with 8 x 8 pixels was used. The spatial resolution is about 2.1 mm. We clearly observed the image of the change on Bragg-edge shapes and the strain distribution. The total cross-section around the bending points was larger than other areas but there was no change in the Bragg-edge positions, which would correspond to the change of the microstructure. We obtained the image of residual strain at several points. The values of the residual strain at several lattice planes, epsilon(110), epsilon(200) and epsilon(211), are -263 to 1707 mu epsilon, -612 to 1665 mu epsilon and -1205 to 327 mu epsilon, respectively. It is indicated that the residual strain measurement by the Bragg-edge transmission is riot inferior to the high-resolution Bragg diffraction. (C) 2009 Elsevier B.V. All rights reserved.
  • Kazuhiro Mori, Ryoji Kiyanagi, James W. Richardson, Joe Fieramosca, Yohei Onodera, Keiji Itoh, Masaaki Sugiyama, Takashi Kamiyama, Toshiharu Fukunaga
    SOLID STATE IONICS 180 6-8 541 - 545 2009年05月 [査読有り][通常論文]
     
    Neutron powder diffraction experiments were carried out to investigate a change in a crystal structure of La(0.8)Sr(0.2)Ga(0.65)Fe(0.35)O(3) for oxygen partial pressures, P(O2), at 800 degrees C. The crystal structure was refined on the basis of the R3c syrnmetry for the P(O2) range from 10(-1) to 10(-20) atm, by the Rietveld analysis. It was found that lattice parameters, a and c, monotonically expand with decreasing P(O2), and then both expansions are rapidly suppressed below 10(-4) atm. In the meantime, I(M-O) and I(O-O)(2) also discontinuously increased with decreasing P(O2), while I(O-O)(1) did not change at all P(O2), where I(M-O), I(O-O)(1) and I(O-O)(2) are the bond lengths within a MO(6) octahedron (M = Ga(0.65)Fe(0.35)). This result indicates that the I(M-O) and the I(O-O)(2) are more important than the I(O-O)(1) for such a complicated lattice expansion for P(O2). (C) 2008 Elsevier B.V. All rights reserved.
  • Kazuhiro Mori, Yohei Onodera, Ryoji Kiyanagi, James W. Richardson, Keiji Itoh, Masaaki Sugiyama, Takashi Kamiyama, Toshiharu Fukunaga
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 600 1 328 - 331 2009年02月 [査読有り][通常論文]
     
    Mixed ionic-electronic conductor of Fe doped lanthanum gallate, La0.8Sr0.2Ga1-xFexO3. has been studied by the dc four-probe method and the neutron powder diffraction. In the electrical conductivity measurement at RT, insulator-metal transition-like phenomenon was observed at around x similar to 0.35; this suggests an existence of the percolation limit for the electronic conductivity. Simultaneously, a bond length between O atoms. l(o-o), in a MO6 octahedron (M=Ga1-xFex) drastically expands over x similar to 0.4, according to the result of crystal structure refinement based on the hexagonal phase. Such a drastic expansion in the l(o-o) would induce the decrease in the oxygen ionic conductivity. (C) 2008 Elsevier B.V. All rights reserved.
  • Yoshiaki Kiyanagi, Takashi Kamiyama, Osamu Takada, Keigo Morita, Kenji Iwase, Shun Suzuki, Michihiro Furusaka, Fujio Hiraga, Satoshi Tomioka, Kaichiro Mishima, Nobuyuki Takenaka, Takashi Ino
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 600 1 167 - 169 2009年02月 [査読有り][通常論文]
     
    Spectroscopic transmission method using a pulsed neutron source combined with a 2-dimensional position sensitive detector is expected to give texture information of materials depending on the position. This method gives not only the transmission imaging of the objects but also the structural imaging obtained by the total cross-section of the materials including the Bragg edges. In order to study the structural change due to welding, we performed transmission experiments and obtained the cross-section map of the welded sample. In the case of welded samples, the cross-section changed depending on the position. It clearly showed the welded region, heat affected region, and as-cast region, and indicated texture change reflecting the cross-section. It suggests that the method will have a possibility to give more information on microstructure of materials, such as density change, grain size and so on. (c) 2008 Elsevier B.V. All rights reserved.
  • Hirotaka Sato, Takashi Kamiyama, Yoshiaki Kiyanagi, Susumu Ikeda
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 600 1 135 - 138 2009年02月 [査読有り][通常論文]
     
    We are developing the pulsed neutron imaging technique using the time-of-flight (TOF) spectroscopy. Neutron resonance absorption spectroscopy (N-RAS) can identify individual nuclides, deduce its density and study its dynamics by analyzing energy, intensity and Doppler broadening of each resonance absorption peak. N-RAS/ computer tomography (CT), which is N-RAS combined with CT, can non-destructively show the tomographic image indicating the distribution of resonance nuclide and its dynamics inside various materials. However, large resonance absorption cross-section frequently causes the self-shielding effect, distorting the reconstructed CT image. Therefore, in the previous experiment, we obtained a reconstructed CT image different from the real distribution of resonance nuclide, using a data processing method without the self-shielding correction. For this reason, we have proposed a new data processing method to correct the self-shielding effect for N-RAS/CT, and carried out Monte-Carlo simulations to examine the feasibility of this method. As a result, we have succeeded in establishing a procedure that produces the undistorted CT image, indicating the absolute value of resonance nuclide density. (C) 2008 Elsevier B.V. All rights reserved.
  • H. Iwashita, H. Iwasa, F. Hiraga, T. Kamiyama, Y. Kiyanagi, J. Suzuki, T. Shinohara, T. Oku, H. M. Shimizu
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 600 1 129 - 131 2009年02月 [査読有り][通常論文]
     
    A pulsed sextupole electromagnetic lens with suitably controlled time-dependent magnetic field can in principle focus pulsed neutrons at the same focal point over a wide range of wavelength as the lens removes aberrations. However, in fact, it is difficult to focus neutrons over a wide range of wavelength because attenuation of a practical pulsed sextupole electromagnet is faster than an ideal case. We have devised a method of canceling the difference between the practical pulsed sextupole magnetic field and the ideal magnetic field with the use of a permanent sextupole magnet. We performed simulation calculations to investigate the feasibility of this method, and it was shown that focusing wavelength range spread compared with the case using a pulsed magnetic lens only. This result indicates the usefulness of the method. (C) 2008 Published by Elsevier B.V.
  • Takashi Kamiyama, Hirotaka Sato, Naoki Miyamoto, Hirokatsu Iwasa, Yoshiaki Kiyanagi, Susumu Ikeda
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 600 1 107 - 110 2009年02月 [査読有り][通常論文]
     
    Neutron tomography was studied using a neutron resonance absorption spectrometer installed on a pulsed neutron source. The neutron resonance absorption spectroscopy (N-RAS) is a method to study the dynamics of nuclides by analyzing the Doppler broadening of their resonance spectra. N-RAS can combine with the computer tomography (CT) technique to obtain the tomogram of an object. We developed the CT reconstructions which were repeated at each time-of-flight (TOF) channel and piled up the reconstructed images in order to make the resonance spectrum over the wide energy range. Finally, we could deduce the information of nuclides and its temperature distributions in the sample non-destructively. We call this new TOF tomography technique as neutron resonance imaging (NRI). (C) 2008 Elsevier B.V. All rights reserved.
  • Atsushi Kimura, Kazuyoshi Furutaka, Shinji Goko, Hideo Harada, Masayuki Igashira, Takashi Kamiyama, Katabuchi Katabuchi, Tadahiro Kin, Koichi Kino, Fumito Kitatani, Yoshiaki Kiyanagi, Mitsuo Koizumi, Motoharu Mizumoto, Shoji Nakamura, Masayuki Ohta, Masumi Oshima, Yosuke Toh
    IEEE Nuclear Science Symposium Conference Record 138 - 143 2009年 [査読有り][通常論文]
     
    To correct dead time in TOF experiments with multi-detector gamma-ray detection method, we have tested a dead-time correction method. In this dead-time correction method, random timing pulses generated by a random pulse generator are input to every pre-amplifier via test-signal inputs. Both the random timing pulses and the other pulses originated from gamma rays are measured with a data acquisition system (DAQ). At the same time, a number of the input random timing pulses are counted with another fast system. Because dead time affects similarly both the pulses from the random pulse generator and the measured gamma rays, we can calculate the dead time by comparing the number of the input random timing pulses counted by the fast system with an area count of the peak due to the random timing pulses measured with the DAQ. ©2009 IEEE.
  • Takashi Kamiyama, Naoki Miyamoto, Satoshi Tomioka, Tamotsu Kozaki
    IEEE Nuclear Science Symposium Conference Record 1266 - 1270 2009年 [査読有り][通常論文]
     
    Neutron resonance absorption spectroscopy (N-RAS) with a pulsed neutron source can distinguish the dynamics of individual nuclides which have neutron resonance peaks on epithermal neutron region. Because some of the resonance absorption cross sections have very large values, N-RAS could match the small neutron pulse source by its high sensitivity. The analyzed spectra information of nuclide presence and its effective temperature can be reconstructed as distributions over the object cross-section using computer tomography (CT). In this study the projected nuclide densities were obtained from the resonance absorption equation fitting with the series of obtained spectra. Then, we reconstructed the quantitative nuclide density tomogram using the CT technique about them. ©2009 IEEE.
  • T. Kin, K. Furutaka, S. Goko, H. Harada, M. Igashira, T. Kamiyama, T. Katabuchi, A. Kimura, K. Kino, F. Kitatani, Y. Kiyanagi, M. Koizumi, M. Mizumoto, S. Nakamura, M. Ohta, M. Oshima, Y. Toh
    IEEE Nuclear Science Symposium Conference Record 1194 - 1197 2009年 [査読有り][通常論文]
     
    A 4π germanium spectrometer was developed for measurements of neutron capture cross sections of minor actinides and long-lived-fission products. It was installed on the Beam Line No. 04 of the MLF in the J-PARC. We measured its full-energy peak efficiency and gamma-energy resolution at 1.3-MeV with a 60Co standard source (10kBq). As an example of a result of TOF measurements with the spectrometer, preliminary TOF and energy spectra of 108Pd are shown in this paper. ©2009 IEEE.
  • A. Kimura, K. Furutaka, S. Goko, H. Harada, M. Igashira, T. Kamiyama, T. Katabuchi, T. Kin, K. Kino, F. Kitatani, Y. Kiyanagi, M. Koizumi, M. Mizumoto, S. Nakamura, M. Ohta, M. Oshima, Y. Toh
    2009 IEEE NUCLEAR SCIENCE SYMPOSIUM CONFERENCE RECORD, VOLS 1-5 138 - + 2009年 [査読無し][通常論文]
     
    To correct dead time in TOF experiments with multi-detector gamma-ray detection method, we have tested a dead-time correction method. In this dead-time correction method, random timing pulses generated by a random pulse generator are input to every pre-amplifier via test-signal inputs. Both the random timing pulses and the other pulses originated from gamma rays are measured with a data acquisition system (DAQ). At the same time, a number of the input random timing pulses are counted with another fast system. Because dead time affects similarly both the pulses from the random pulse generator and the measured gamma rays, we can calculate the dead time by comparing the number of the input random timing pulses counted by the fast system with an area count of the peak due to the random timing pulses measured with the DAQ.
  • T. Kin, K. Furutaka, S. Goko, H. Harada, M. Igashira, T. Kamiyama, T. Katabuchi, A. Kimura, K. Kino, F. Kitatani, Y. Kiyanagi, M. Koizumi, M. Mizumoto, S. Nakamura, M. Ohta, M. Oshima, Y. Toh
    2009 IEEE NUCLEAR SCIENCE SYMPOSIUM AND MEDICAL IMAGING CONFERENCE RECORD (NSS/MIC) 1194 - + 2009年 [査読無し][通常論文]
     
    A 4 pi germanium spectrometer was developed for measurements of neutron capture cross sections of minor actinides and long-lived-fission products. It was installed on the Beam Line No. 04 of the MLF in the J-PARC. We measured its full-energy peak efficiency and gamma-energy resolution at 1.3-MeV with a Co-60 standard source (10kBq). As an example of a result of TOF measurements with the spectrometer, preliminary TOF and energy spectra of Pd-108 are shown in this paper.
  • T. Kamiyama, N. Miyamoto, S. Tomioka, T. Kozaki
    2009 IEEE NUCLEAR SCIENCE SYMPOSIUM CONFERENCE RECORD, VOLS 1-5 1266 - + 2009年 [査読無し][通常論文]
     
    Neutron resonance absorption spectroscopy (N-RAS) with a pulsed neutron source can distinguish the dynamics of individual nuclides which have neutron resonance peaks on epithermal neutron region. Because some of the resonance absorption cross sections hale very large values, N-RAS could match the small neutron pulse source by its high sensitivity. The analyzed spectra information of nuclide presence and its effective temperature can he reconstructed as distributions over the object cross-section using computer tomography (CT). In this study the projected nuclide densities were obtained from the resonance absorption equation fitting with the series of obtained spectra. Then, we reconstructed the quantitative nuclide density tomogram using the CT technique about them.
  • 加美山隆, 池田篤司, 岩佐浩克, 鬼柳善明
    可視化情報学会誌 28 Suppl.2 121 - 122 2008年09月15日 [査読有り][通常論文]
  • T. Kamiyama, N. Seki, H. Iwasa, T. Uchida, Y. Kiyanagi, T. Ebinuma, H. Narita, N. Igawa, Y. Ishii, S. M. Benningto
    Proceedings of the 6th International Conference on Gas Hydrates 2008年07月 [査読無し][通常論文]
  • Koji Oishi, Kazuaki Kosako, Takashi Nakamura, Yuki Kobayashi, Issei Sonoki, Koichi Sato, Takashi Kamiyama, Yoshiaki Kiyanagi
    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY 32 - 35 2008年06月 [査読有り][通常論文]
     
    Benchmark experiments on dose rate of neutrons and photons in the laminated shielding assembly have been performed at the 45 MeV electron linac facility of Hokkaido University. The accelerating energies of electron were 18, 25 and 34 MeV The shielding materials were iron and concrete. Photons were produced in the Cu target set in the direction of 0 degree to the beam line. The detectors used were CR-39 and glass-dosimeter for neutrons and photons, respectively. Analyses have also been performed by using the Monte-Carlo calculation code MCNP-5. The nuclear data libraries used for the analyses were JENDL-3.3, MCPLIB04, and EL3 for neutrons, photons, and electrons, respectively. Three different libraries reproduced by using NJOY process code from LA150, JENDL/PD-2004, and KAERI, were applied for the calculation of photo-nuclear reaction. Comparisons between experimental results and calculated ones were performed. For neutrons very good agreements were obtained at the front surface of the shielding assembly in the case of all energies, however calculational to experimental (C/E) values increased as the depth of the shielding assembly increased. On the other hand, underestimations of the calculated results for photons were observed except on the front Surface. It is concluded that further investigation of production of photo-neutrons and secondary gamma-rays in the iron and concrete laminated shield would be necessary.
  • Kazuaki Kosako, Koji Oishi, Takashi Nakamura, Yuki Kobayashi, Issei Sonoki, Koichi Sato, Takashi Kamiyama, Yoshiaki Kiyanagi
    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY 36 - 38 2008年06月 [査読有り][通常論文]
     
    In recent years, the acceleration energy of electron linac for medical use increases up to higher than 10 MeV The angular distributions of photo-neutrons and bremsstrahlung photons emitted from the linear accelerator (linac) have become important issues for the evaluation of exposure dose to whole body of patient and the maze design in linac room. Therefore, benchmark experiments on angular dose rate of neutrons and photons from the metal targets have been performed at the 45 MeV linac facility of Hokkaido University. The electron energies were 18, 25 and 34 MeV The metal target materials were aluminum, iron, copper, tungsten and lead. The detectors used were CR-39 for neutron and glass-dosimeter for photons. Analyses have also been performed by using the Monte Carlo calculation code MCNP5, for neutron, photon and electron. Three different libraries of LA150, JENDL/PD-2004 and KAEPI were applied for photonuclear reaction. Comparisons between experimental results and calculated ones were performed. For neutrons and photons, although the trend of experimental data for angular distribution was well traced by calculation, the underestimation of calculation was conspicuous. It is concluded that further investigation of production of neutrons, photons and electrons from the targets and close components should be necessary.
  • 加美山 隆
    非破壊検査 = JOURNAL OF THE JAPANESE SOCIETY FOR NON-DESTRUCTIVE INSPECTION 57 6 273 - 277 日本非破壊検査協会 2008年06月01日 [査読無し][通常論文]
  • Inelastic neutron scattering in superionic conducting glass Ag2GeSe3
    Y Kawakita, K Shibata, T. Kamiyama, S Takeda
    Journal of Physics: Conference Series 98 022009  2008年 [査読有り][通常論文]
  • Y. Kiyanagi, T. Kamiyama, T. Nagata, K. Sakuma, H. Iwasa, F. Hiraga, K. Iwase
    NEUTRON RADIOGRAPHY 363 - 368 2008年 [査読無し][通常論文]
     
    Imaging using a pulsed neutron time-of-flight method is useful to investigate the microstructure of the texture of materials such as metals. We measured total cross sections over the wavelength region of Bragg edges using a position sensitive detector with 64-pixels of 1.7 mm(2) size. It was found that in the case of an SS plate processed by heat treatment, it had a smaller total cross section than the SS samples with a surface treatment, and fine substructures appeared in the total cross section data corresponding to each Bragg edge in each pixel image. The fine structure may be attributed to inhomogeneous distribution of the rather large crystalline. The results suggest that the pulsed neutron imaging can have the capability to give information of the micro structure of materials.
  • Shigeomi Takai, Takayuki Shinohara, Akinori Hoshikawa, Stefanus Harjo, Kenichi Oikawa, Toru Ishigaki, Takashi Kamiyama, Takao Esaka
    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 115 1347 780 - 785 2007年11月 
    Powder neutron diffraction experiments with Rietveld analyses were carried out on pure and Ta-substituted Zn2TiO4 at room temperature to investigate the defect structure together with the oxide ion conduction mechanism. The refined structure of pure-Zn2TiO4 agreed well with the previously reported inverse spinet-type structure with cubic symmetry. For Zn2-x/2Ti1-xTaxO4 solid solutions of cubic phase, the tantalum substitution as well as the vacancy formation was made at the octahedral cation site, while the tetrahedral cation site was occupied by zinc ions without any significant deficiency. Essentially the similar results were attained in the tetragonal phase obtained by long-term annealing. By evaluating the occupation factors of tentatively introduced oxide ion interstitials at various positions, oxide ion conduction was supposed to be made with the interstitialcy diffusion mechanism, where displacement of a regular oxide ion toward the cation vacancy enabled the migration of other oxide ions through the oxide ion vacancy at which the displaced oxide ion had been initially.
  • 加美山隆
    日本熱物性シンポジウム予稿集 28 WS003/1 - WS003/2 2007年10月 [査読無し][通常論文]
  • Masahiro Kajitani, Motohide Matsuda, Akinori Hoshikawa, Stefanus Harjo, Takashi Kamiyama, Toru Ishigaki, Fujio Izumi, Michihiro Miyake
    JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS 68 5-6 758 - 764 2007年05月 
    In order to discuss oxide ion conduction mechanism for LaGaO3-based perovskite compounds, doping effects were investigated using two kinds of solid solutions whose oxygen vacancy concentrations are the same: one is La0.9Sr0.1 Ga0.9Mg0.1O2.9 with A-site and B-site substitutions and the other is LaGa0.8Mg0.2O2.9 with only B-site substitution. Conductivity measurements showed that La0.9Sr0.1 Ga0.9Mg0.1O2.9 had a circumstance whereby oxide ion could more easily diffuse in the perovskite structure than in LaGa0.8Mg0.2O2.9. Structural analyses using neutron diffraction found out the following three differences: the first finding was that the saddle point formed by two A-site cations and one B-site cation in La0.9Sr0.1.,Ga-0.9 Mg0.1O2.9 was larger than that in LaGa0.8Mg0.2O2.9 due to larger displacements of A-site and B-site cations, the second was that the doubly doping with Sr and Mg was more effective for reduction of GaO6 octahedral tilt angles than the doping with Mg; the last was that La0.9Sr0.1Ga0.9Mg0.1O2.9, had larger oxygen displacement than LaGa0.8Mg0.2O2.9. It was considered that these structurally related parameters dominated the high oxide ion conduction in LaGaO3-based perovskite compounds. (c) 2007 Elsevier Ltd. All rights reserved.
  • Kazuhiro Mori, Takashi Kamiyama, Hisao Kobayashi, Toshiya Otomo, Kusuo Nishiyama, Masaaki Sugiyama, Keiji Itoh, Toshiharu Fukunaga, Susumu Ikeda
    JOURNAL OF APPLIED CRYSTALLOGRAPHY 40 SUPPL. 1 S501 - S505 2007年04月 [査読有り][通常論文]
     
    The magnetic state in 6H-type BaFeO3-delta at low temperature was studied using small-angle neutron scattering, positive-muon spin relaxation and magnetization measurements. These experiments demonstrate the appearance of two different types of magnetic states: an antiferromagnetic ordering with a long-range correlation and magnetic domains with a short-range correlation. The antiferromagnetic Fe spin arrangement occurs below 130 K. In contrast, the magnetic domains are formed below 170 K and the average size of the magnetic domains was estimated as similar to 124 angstrom. These results explain the discrepancy of the Neel temperatures between three measurement techniques: magnetization, neutron powder diffraction and Mossbauer measurements. Furthermore, it was found that the magnetic domains coexist with the long-range antiferromagnetic ordering below 130 K.
  • T. Taniguchi, S. Mizusaki, N. Okada, Y. Nagata, K. Mori, T. Wuernisha, T. Kamiyama, N. Hiraoka, M. Itou, Y. Sakurai, T. C. Ozawa, Y. Noro, H. Samata
    PHYSICAL REVIEW B 75 2 024414  2007年01月 [査読有り][通常論文]
     
    Neutron powder diffraction and magnetic Compton scattering measurements were conducted for ferromagnetic CaRu0.85Fe0.15O3 at temperatures between 10 and 300 K. Anomalous volume expansion was observed in the neutron diffraction measurement below the Curie temperature (85 K), and Invar-like behavior was observed below 40 K. However, no structural phase transition was observed down to 10 K. The strong correlation between the volume expansion, Delta V, and the square magnetization, M-2, suggests that the anomalous volume expansion is due to the magnetovolume effect that is caused by the occurrence of ferromagnetism. The magnetic Compton scattering experiments revealed the existence of a magnetic moment on Ru and the antiferromagnetic configuration of Fe and Ru moments. The formation of a ferrimagnetic order through the induction of the magnetic moment on the Ru ion is a possible reason for the anomalous volume expansion observed for CaRu0.85Fe0.15O3.
  • Y. Tomota, K. Ikeda, M. Ojima, J. Suzuki, T. Kamiyama
    THERMEC 2006, PTS 1-5 539-543 234 - + 2007年 [査読有り][通常論文]
     
    Neutron scattering was performed to investigate nano-structure and deformation mechanism in SUS310 steels with different concentrations of nitrogen. The nano-sized cluster is suggested by small angle neutron scattering (SANS). The microstructural change and the generation of intergranular stress with plastic deformation were examined by in situ SANS and in situ Bragg diffractions during tensile loading. It is revealed that the clusters are destroyed by dislocation motion leading to evolve a planar net-work substructure, which yields high intergranular stresses in a high nitrogen bearing steel. Both thermal and athermal stress components of flow stress are increased with increasing of nitrogen content. Hence, the high nitrogen bearing steel exhibits high flow stress with a considerable amount of work-hardening at a high speed deformation. The flow stress is described by the Kocks-Mecking model.
  • Fumihito Shikanai, Keisuke Tomiyasu, Ryoji Kiyanagi, Masao Yonemura, Kenji Iwase, Dyah Sulistyanintyas, Tuerxun Wurnisha, Kazuhiro Mori, Toru Ishigaki, Itaru Tsukushi, Susumu Ikeda, Takashi Kamiyama
    FERROELECTRICS 347 74 - 78 2007年 [査読有り][通常論文]
     
    Crystal structures of protonic conductor K3H(SeO4)(2) in the phase I (conducting phase) and phase II (room-temperature phase) have been determined using a time-of-flight (TOF) neutron diffractometer VEGA. SeO4 tetrahedra in the phase I were rotationally displaced with the occupancy 1/3 and the crystal structure in the phase II was remain locally. Proton distribution maps were obtained from the maximum entropy method (MEM) describe that the amount of the proton in a hydrogen bond were decline from 87.3% to 21.4% with increasing the temperature and 13.4% of protons exist at inter-layer space. Incoherent quasi-elastic neutron scattering (QENS) experiments performed by LAM80-ET spectrometer yield the QENS spectra of conducting protons. Proton diffusion constants are estimated as 1.9(1) x 10(-10) m(2)/s at 393 K and 2.1(3) x 10(-10) m(2)/s at 413 K, respectively.
  • T. Ishigaki, A. Hoshikawa, M. Yonemura, T. Kamiyama, S. Harjo, K. Aizawa, T. Sakuma, Y. Tomota, Y. Morii, M. Arai, M. Hayashi, K. Ebata, Y. Takano, T. Kasao
    Zeitschrift fur Kristallographie, Supplement 1 26 177 - 182 2007年 
    Ibaraki prefecture, the local government of the area for J-PARC site, has decided to build a versatile powder diffractometer (IBARAKI Materials Design Diffractometer) to promote industrial applications for neutron beams in J-PARC. This diffractometer is designed to be a high throughput one enabling materials scientists to use it like the chemical analytical instruments in their material development processes. It covers in d range 0.18 < d (Å) < 5 with Δd/d = 0.16% at the high resolution scattering detector bank, and covers 5 < d (Å) < 800 with gradually changing resolution. Typical measuring time to obtain a 'Rietveld-quality' data is several minutes for the sample size of laboratory X-ray diffractometer. To promote industrial application, a utilization system for this diffractometer is required. We will establish a support system for both academic and industrial users who are willing to use neutrons but have not been familiar with neutron diffraction. © by Oldenbourg Wissenschaftsverlag.
  • K. Iwase, T. Nagata, K. Sakuma, O. Takada, T. Kamiyama, Y. Kiyanagi
    IEEE Nuclear Science Symposium Conference Record 2 1716 - 1719 2007年 [査読有り][通常論文]
     
    The Bragg-edge positions of annealed sample correspond to as cast one and the total cross section of it is smaller than as cast one. Total cross section may be influenced by the crystallite size and extinction. Multiple scattering will occur in the same crystal grain if the crystallite size is large. The extinction seems to increase with increasing crystallite size. The powder Si is prepared by rushing the single crystal of Si, so that the grain size agrees with crystallite size. Si was sieved to get grain sizes about 2.7μm, 100μm and 200μm, respectively. The Bragg-edge positions among the three samples are same. The total cross section decreases with increasing the crystallite size. It is found that the total cross section depends on the crystallite size and the extinction is one factor to decrease the value of total cross section. Bragg-edge neutron transmission is a useful tool as nondestructive test. © 2007 IEEE.
  • T. Kamiyama, H. Sato, N. Miyamoto, H. Iwasa, Y. Kiyanagi, S. Ikeda
    IEEE Nuclear Science Symposium Conference Record 2 1720 - 1724 2007年 [査読有り][通常論文]
     
    Neutron tomography was studied using the neutron resonance absorption spectrometer installed on the pulsed neutron source. The neutron resonance absorption spectroscopy (N-RAS) is a method to study the dynamics of nuclides by analyzing the Doppler broadening of their resonance spectra. N-RAS can combine with the computer tomography (CT) technique to obtain the cross sectional image of the sample. We develop the method as detailed analysis of time-of flight (TOF) resonance absorption spectra. The CT reconstructions are repeated at each TOF channel and pile up the reconstructed images in order to make the resonance spectrum over the wide energy range. Finally, we can deduce the information of nuclides and its temperature distributions in the sample non-destructively. We call this new technique as neutron resonance imaging (NRI). © 2007 IEEE.
  • Study of Neutron Tomography using Neutron Resonance Absorption
    T. Kamiyama, H. Sato, N. Miyamoto, H. Iwasa, Y. Kiyanagi, S. Ikeda
    Proceedings of 18th Meeting of the International Collaboration on Advanced Neutron Sources (ICANS-XVIII) 2007年 [査読無し][通常論文]
  • T. Kamiyama, T. Masaki, T. Itami
    KENS REPORT-XV 2003-2006, KEK Pregress Report 2006-4 169 - 170 2007年 [査読無し][通常論文]
  • Y. Nakamura, T. Kamiyama, E. Akiba
    KENS REPORT-XV 2003-2006, KEK Pregress Report 2006-4 243 - 244 2007年 [査読無し][通常論文]
  • K. Suzuya, K. Kusaka, S. Torii, S. Harjo, K. Aizawa, S. Sato, T. Kamiyama, M. Arai
    KENS REPORT-XV 2003-2006, KEK Pregress Report 2006-4 318 - 319 2007年 [査読無し][通常論文]
  • T. Kamiyama, H. Sato, J. Ito, H. Noda, H. Iwasa, Y. Kiyanagi, S. Ikeda
    KENS REPORT-XV 2003-2006, KEK Pregress Report 2006-4 321 - 323 2007年 [査読無し][通常論文]
  • S. Itoh, T. Yokoo, K. Ohoyama, T. Kamiyama, O. Yamamuro, K. Kuwahara, T. Otomo, K. Nakajima, R. Kajimoto, K. Tomiyasu, H. Sagehashi
    KENS REPORT-XV 2003-2006, KEK Pregress Report 2006-4 350 - 352 2007年 [査読無し][通常論文]
  • Y. Kiyanagi, S. Ohnuma, T. Kai, T. Kamiyama, F. Hiraga
    KENS REPORT-XV 2003-2006, KEK Pregress Report 2006-4 380 - 382 2007年 [査読無し][通常論文]
  • K. Iwase, T. Nagata, K. Sakuma, O. Takada, T. Kamiyama, Y. Kiyanagi
    2007 IEEE NUCLEAR SCIENCE SYMPOSIUM CONFERENCE RECORD, VOLS 1-11 1716 - + 2007年 [査読無し][通常論文]
     
    The Bragg-edge positions of annealed sample correspond to as cast one and the total cross section of it is smaller than as cast one. Total cross section may be influenced by the crystallite size and extinction. Multiple scattering will occur in the same crystal grain if the crystallite size is large. The extinction seems to increase with increasing crystallite size. The powder Si is prepared by rushing the single crystal of Si, so that the grain size agrees with crystallite size. Si was sieved to get grain sizes about 2.7 mu m, 10 mu m and 200 mu m, respectively. The Bragg-edge positions among the three samples are same. The total cross section decreases with increasing the crystallite size. It is found that the total cross section depends on the crystallite size and the extinction is one factor to decrease the value of total cross section. Bragg-edge neutron transmission is a useful tool as nondestructive test.
  • T. Kamiyama, H. Sato, N. Miyamoto, H. Iwasa, Y. Kiyanagi, S. Ikeda
    2007 IEEE NUCLEAR SCIENCE SYMPOSIUM CONFERENCE RECORD, VOLS 1-11 1720 - + 2007年 [査読無し][通常論文]
     
    Neutron tomography was studied using the neutron resonance absorption spectrometer installed on the pulsed neutron source. The neutron resonance absorption spectroscopy (N-RAS) is a method to study the dynamics of nuclides by analyzing the Doppler broadening of their resonance spectra. N-RAS can combine with the computer tomography (CT) technique to obtain the cross sectional image of the sample. We develop the method as detailed analysis of time-of flight (TOF) resonance absorption spectra. The CT reconstructions are repeated at each TOF channel and pile up the reconstructed images in order to make the resonance spectrum over the wide energy range. Finally, we can deduce the information of nuclides and its temperature distributions in the sample non-destructively. We call this new technique as neutron resonance imaging (NRI).
  • Takashi Mochiku, Yoshiaki Hata, Kenji Iwase, Masao Yonemura, Stefanus Harjo, Akinori Hoshikawa, Kenichi Oikawa, Toru Ishigaki, Takashi Kamiyama, Hiroki Fujii, Fujio Izumi, Kazuo Kadowaki, Kazuto Hirata
    Physica B: Condensed Matter 385-386 I 561 - 563 2006年11月27日 
    FeSr YCu O exhibits superconductivity around 50 K, when it is properly annealed in N atmosphere and subsequently in O atmosphere, although as-synthesized FeSr YCu O does not exhibit superconductivity. To understand the effect of annealing on superconductivity, we have performed in-situ high-temperature neutron powder diffraction measurements in N atmosphere. We have found that the N annealing at 650 °C promoted the atomic ordering of Cu and Fe and that the phase transition occurred from tetragonal structure to orthorhombic superstructure at 750 °C. The atomic ordering of Cu and Fe did not change at all during the following annealing process. Consequently, this compound exhibits superconductivity by supplying the carrier onto the CuO sheet. © 2006 Elsevier B.V. All rights reserved. 2 2 6+δ 2 2 2 2 6+δ 2 2 2
  • Stefanus Harjo, Takashi Kamiyama, Shuki Torii, Toru Ishigaki, Masao Yonemura
    Physica B: Condensed Matter 385-386 1025 - 1028 2006年11月15日 
    Ibaraki prefecture materials design diffractometer of J-PARC needs a neutron guide to increase beam intensity without sacrificing measurements of powder diffraction with good resolution, PDF analysis and small angle scattering. Non-parallel guides including elliptical ones have been compared with a linear-straight guide using the McStas simulation. The elliptical guide having the exit focal points away behind the sample position is available to increase the neutron flux at the sample but gives a slight lowering of the instrumental resolution. This elliptical guide gives also Garland peaks at short wavelengths that may give large ambiguities in powder diffraction measurements. Therefore, the linear-straight guide is considered as the best choice for this instrument to keep a good resolution and also a relatively high flux. © 2006 Elsevier B.V. All rights reserved.
  • Tuerxun Wuernisha, Fumihiko Sano, Yumiko Takahashi, Masao Yonemura, Stefanus Harjo, Yoshiki Takano, Kazuko Sekizawa, Takashi Kamiyama
    Physica B: Condensed Matter 385 116 - 118 2006年11月 [査読無し][通常論文]
     
    The crystal structure of Pr(Ba1-xSrx)2Cu3Oy compounds with 0≤x≤0.5 has been investigated by high-resolution neutron powder diffraction measurements at room temperature. The bulk samples were prepared by sintering at high temperature under reducing atmosphere. The solubility range of Sr in Pr(Ba1-xSrx)2Cu3Oy was found to be 0≤x≤0.5. The Rietveld refinement results revealed that Sr ions occupied only the Ba sites, and Pr ions could not occupy the Ba sites. Substitution of Sr for the Ba site induces oxygen disorder in the Cu-O layer. The distance of Pr-O between Pr and oxygen on the CuO2 plane does not show obvious change for x≤0.3. Above x=0.3, the distance of Pr-O gradually increases with x. These results indicate that both reductive condition and Sr substitution play an important role in weakening the hybridization between the Pr 4f and O 2p orbital in PrBa2Cu3Oy. © 2006 Elsevier B.V. All rights reserved.
  • Kazuhiro Mori, Ryoji Kiyanagi, Masao Yonemura, Kenji Iwase, Takashi Sato, Keiji Itoh, Masaaki Sugiyama, Takashi Kamiyama, Toshiharu Fukunaga
    JOURNAL OF SOLID STATE CHEMISTRY 179 11 3286 - 3294 2006年11月 [査読有り][通常論文]
     
    In order to study the crystal structure of beta-Ca2SiO4, time-of-flight neutron powder diffraction experiments were carried out at temperatures between room temperature (RT) and 600 degrees C. Rietveld refinement at RT has shown that beta-Ca2SiO4 is monoclinic based on P2(1)/n symmetry and two different types of Ca sites, Ca(1) and Ca(2). All interatomic distances within 3 angstrom were calculated, with the valences of Ca(1) with seven Ca-O bonds and Ca(2) with eight were estimated to be 1.87+ and 2+ by the Zachariasen-Brown-Altermatt formula (bond valence sum). Applying charge neutrality the two charge states of Ca in beta-Ca2SiO4 are [Ca(1)SiO4](2-) and Ca(2)(2+), respectively. Furthermore, the [Ca(1)SiO4](2-) unit has the shortest Ca-O distance, and its length kept constant at 2.23 angstrom at all temperatures. In the short-range structure analysis at RT, the shortest Ca-O bond was also observed in a radial distribution function. These results imply that the [Ca(1)SiO4](2-) unit has covalency on the shortest Ca-O in addition to Si-O. (c) 2006 Elsevier Inc. All rights reserved.
  • Kazuhiro Mori, Takashi Sato, Toshiharu Fukunaga, Koji Oishi, Katsuhiko Kimura, Kenji Iwase, Masaaki Sugiyama, Keiji Toh, Fumihito Shikanai, Tuerxun Wuernisha, Masao Yonemura, Dyah Sulistyanintyas, Itaru Tsukushi, Shinich Takata, Toshiya Otomo, Takashi Kamiyama, Masayoshi Kawai
    PHYSICA B-CONDENSED MATTER 385 Pt.1 517 - 519 2006年11月 [査読有り][通常論文]
     
    Quasi-elastic neutron scattering experiments were carried out to evaluate the hydration rate of tricalcium silicate (Ca3SiO5)Furthermore, in the early hydration period, a variation in surface roughness of Ca3SiO5 was observed in nano-scale by the small-angle neutron scattering. From these results, it was found that the hydration rate of Ca3SiO5 is suppressed when the surface of Ca3SiO5 becomes rough through the creation of hydration products C-S-H gel and Ca(OH)(2), and this roughness is associated with changes in the Ca3SiO5 hydration rate. (c) 2006 Elsevier B.V. All rights reserved.
  • Fumihito Shikanai, Ryoji Kiyanagi, Masao Yonemura, Dyah Sulistyanintyas, Kenji Iwase, Tuerxun Wuernisha, Kazuhiro Mori, Toru Ishigaki, Susumu Ikeda, Takashi Kamiyama
    PHYSICA B-CONDENSED MATTER 385 Pt.1 156 - 159 2006年11月 [査読有り][通常論文]
     
    Neutron powder diffraction measurements were carried out on K3H(SeO4)(2) at 413 K in the protonic conducting phase (phase I) and at 298 K in the room-temperature phase (phase II) using a time-of-flight (TOF) neutron diffractometer VEGA. The crystal structures and nuclear density distribution maps were obtained by the Rietveld method and maximum entropy method (MEM). In the phase I, a proton in the hydrogen bond is disordered and SeO4 tetrahedron is rotationally displaced. The structure in the phase II locally remains even in the phase I. The amount of the proton in the hydrogen bond region varies from 87% for the phase II to 21% for the phase I. In the phase I, the proton densities were also obtained in the inter SeO4 layers space with the amount of 13%. (c) 2006 Elsevier B.V. All rights reserved.
  • K. Mori, T. Fukunaga, Y. Shiraishi, K. Iwase, Q. Xu, K. Oishi, K. Yatsuyanagi, M. Yonemura, K. Itoh, M. Sugiyama, T. Ishigaki, T. Kamiyama, M. Kawai
    CEMENT AND CONCRETE RESEARCH 36 11 2033 - 2038 2006年11月 [査読有り][通常論文]
     
    Mechanical milling was carried out to synthesize amorphous tricalcium silicate (Ca3SiO5) sample, where Ca3SiO5 is the most principal component of Portland cement. The partial phase transformation from the crystalline to the amorphous state was observed by X-ray and neutron diffractions. Moreover, it was found that the structural distortion on the Ca-O correlation exists in the milled Ca3SiO5. The hydration of the milled Ca3SiO5 with D2O proceeds as follows: the formation of hydration products such as Ca(OD)(2) rapidly occurs in the early hydration stage, and then proceeds slowly after about 15 h. The induction time for the hydration of the milled Ca3SiO5 is approximately one half shorter than that for the hydration of the unmilled one. This result means that the mechanical milling brings about the chemical activity of Ca3SiO5 for hydration, and may be particularly useful for increasing the reactivity in the early hydration stage. (c) 2006 Elsevier Ltd. All rights reserved.
  • Shunsuke Nishimoto, Motohide Matsuda, Stefanus Harjo, Akinori Hoshikawa, Toru Ishigaki, Takashi Kamiyama, Michihiro Miyake
    Journal of Solid State Chemistry 179 11 3308 - 3313 2006年11月 
    A layered perovskite compound with Na , D O ions (H O ) and D O molecules (H O) in the interlayer, D Na LaTiO ·yD O, has been prepared by an ion-exchange/intercalation reaction with dilute DCl solution, using an n = 1 Ruddlesden-Popper phase, NaLaTiO . Its structure has been analyzed in order to clarify the interlayer structure by Rietveld method, using powder neutron diffraction data. The structure analysis revealed that the layered structure changed from the space group P4/nmm-I4/mmm after the ion-exchange/intercalation reaction, and it induced the transformation of perovskite layers from staggered to an eclipsed configuration. The D O molecules and D O ions loaded in the interlayer statistically occupied the sites around a body center position of rectangular space surrounded by eight apical O atoms of TiO octahedra in upper and lower layers. © 2006 Elsevier Inc. All rights reserved. + + + + 3 3 2 2 x 1-x 4 2 4 2 3 6
  • Shunsuke Nishimoto, Motohide Matsuda, Stefanus Harjo, Akinori Hoshikawa, Takashi Kamiyama, Toru Ishigaki, Michihiro Miyake
    Journal of Solid State Chemistry 179 11 3590  2006年11月
  • Toru Ishigaki, Stefanus Harjo, Masao Yonemura, Takashi Kamiyama, Kazuya Aizawa, Kenichi Oikawa, Takashi Sakuma, Yukio Morii, Masatoshi Arai, Kazuhiro Ebata, Yoshiki Takano, Takuro Kasao
    PHYSICA B-CONDENSED MATTER 385-86 1022 - 1024 2006年11月 
    Ibaraki prefecture, the local government of the area for J-PARC site, has decided to build a versatile powder diffractometer (IBARAKI Materials Design Diffractometer) to promote industrial applications for neutron beams in J-PARC. This diffractometer is designed to be a high throughput one enabling materials scientists to use it like the chemical analytical instruments in their material development processes. It covers in d range 0.18 < d (angstrom) < 5 with Delta d/d = 0.16% at the high-resolution scattering detector bank, and covers 5 < d(angstrom) < 800 with gradually changing resolution. Typical measuring time to obtain a 'Rietveld-quality' data is several minutes for the sample size of laboratory X-ray diffractometer. To promote industrial application, a utilization system for this diffractometer is required. We will establish a support system for both academic and industrial users who are willing to use neutron but have not been familiar with neutron diffraction. (c) 2006 Elsevier B.V. All rights reserved.
  • T. Kamiyama, N. Seki, H. Iwasa, T. Uchida, T. Ebinuma, H. Narita, N. Igawa, Y. Ishii, S. M. Bennington, Y. Kiyanagi
    PHYSICA B-CONDENSED MATTER 385 202 - 204 2006年11月 [査読有り][通常論文]
     
    Methane hydrate (MH)is a nonstoichiometric inclusion compound of methane with the host framework being composed of two kinds of water cages in a unit cell. We performed neutron inelastic measurements of MH to construct a scattering model of MH. The measurements were carried around 12 K with MARI spectrometer at ISIS in UK and TAS-2 spectrometer at JAERI in Japan. The experimental results show that methane molecular motion can be considered as a free rotor approximately and there still remains some excess peaks less than 10 meV. The origin of these peaks is considered as the localized translational motion of the methane molecule in two kinds of the water cages. (c) 2006 Elsevier B.V. All rights reserved.
  • I. Mitsutake, Y. Kiyanagi, T. Kamiyama, K. Nitta, J. Suzuki, T. Oku, H. M. Shimizu
    PHYSICA B-CONDENSED MATTER 385-86 1229 - 1231 2006年11月 [査読有り][通常論文]
     
    We have performed various simulation calculations for a pulsed sextupole magnetic lens to look for the best condition of focusing experiments, assuming conditions of the pulse magnetic lens now under construction. Here, we placed a slit between the pulsed neutron moderator and the neutron lens, in order to see the focusing effect clearly. For the simulation, we used PHITS code to know influences of the position of the slit on the intensity of focused neutron beam, the focal point, and the broadening of the focal point. Increase of the distance of the slit from the source resulted in the decrease of the peak intensity of neutron beam at the focal point. Full-width at half-maximum of the neutron distribution along the incident beam direction around the focal point, broadened with increasing the distance, and the focal distance also became longer. The intensity ratios defined by (intensity with magnetic field)/(intensity without magnetic field) also increased with decreasing the distance. Therefore, it is better to set a slit near the moderator. (c) 2006 Published by Elsevier B.V.
  • Yoshiaki Kiyanagi, Takashi Kamiyama, Toshiyuki Nagata, Fujio Hiraga, Shun Suzuki
    PHYSICA B-CONDENSED MATTER 385-86 930 - 932 2006年11月 [査読有り][通常論文]
     
    Transmission data using a pulsed neutron source have information on neutron cross-section that reflects the crystal structure of the object, and combined with area detector we can obtain the structural change depending on the position in the object. We performed several experimental studies to observe the change of the structure. We demonstrate position-dependent structural change of the lead in solid. It was indicated that the structure changed largely within few millimeters region. Furthermore, we observed the cross-section change of stainless steel (SS) samples with different treatments, which may be the effect of crystal grain structure of the SS samples caused by different treatment. (c) 2006 Elsevier B.V. All rights reserved.
  • Shunsuke Nishimoto, Motohide Matsuda, Stefanus Harjo, Akinori Hoshikawa, Takashi Kamiyama, Toru Ishigaki, Michihiro Miyake
    Journal of Solid State Chemistry 179 6 1892 - 1897 2006年06月 
    A deuterated n=1 Ruddlesden-Popper compound, DLnTiO (HLnTiO , Ln=La, Nd and Y), was prepared by an ion-exchange reaction of Na ions in NaLnTiO with D ions, and its structure was analyzed by Rietveld method using powder neutron diffraction data. The structure analyses showed that DLaTiO and DNdTiO crystallized in the space group P 4 / nmm with a=3.7232(1) and c=12.3088(1) Å, and a=3.7039(1) and c=12.0883(1) Å, respectively. On the other hand, DYTiO crystallized in the space group P 2 / c with a=11.460(1), b=5.2920(4), c=5.3628(5) Å and β=90.441(9)°. The loaded protons were found to statistically occupy the sites around an apical oxygen of TiO octahedron in the interlayer of these compounds, rather than Na atom sites in NaLnTiO . © 2006 Elsevier Inc. All rights reserved. 4 4 4 4 4 4 1 6 4 + +
  • Satoshi Awaji, Hidetoshi Oguro, Gen Nishijima, Petre Badica, Kazuo Watanabe, Stefanus Harjo, Takashi Kamiyama, Kazumune Katagiri
    IEEE Transactions on Applied Superconductivity 16 2 1228 - 1231 2006年06月 
    The critical current, upper critical field and critical temperature of bronze route Nb Sn commercial wires are enhanced by applying a repeated bending strain at room temperature, i.e., "prebending strain". In order to investigate the prebending effects from a viewpoint of a residual strain, axial and lateral residual strains were evaluated directly by neutron diffraction at room temperature. We found that the axial residual strain changes from -0.10% to 0.02 % but the lateral one is unchanged by applying a prebending strain of 0.5 % for an ordinary bronze route (Nb, Ti) Sn wires without reinforcement. Hence, in the case of the ordinary Nb Sn wires without reinforcement, the prebending treatment modifies only the axial residual strain states independently to the lateral one, although it may depend on the wire structure. The critical current properties under the axial tensile strain suggest that the axial residual strain is reduced by about 0.11% but the radial residual strain unchanged by the prebending treatment of 0.5%. This is consistent with the results of the neutron diffraction. © 2006 IEEE. 3 3 3
  • Hajime Sagayama, Yusuke Wakabayashi, Hiroshi Sawa, Takashi Kamiyama, Akinori Hoshikawa, Stefanus Harjo, Kentaro Uozato, Ajay K. Ghosh, Masashi Tokunaga, Tsuyoshi Tamegai
    Journal of the Physical Society of Japan 75 4 2006年04月 
    Crystal structure analysis of an AlB -type superconductor, CaAlSi, has been carried out using synchrotron X-rays and neutron diffraction measurements. Two different stackings along the c-axis - 5-fold and 6-fold structures - with different values of T 6.0 and 8.2 K, respectively, are confirmed. Our results show that Al and Si atoms are ordered alternately in honeycomb layers, and Ca atoms are intercalated at regular intervals between the (Al,Si) layers in both the structures. The 5-fold and 6-fold structures are determined by the arrangement of Al and Si along the c-axis. The relation between T and the structure is discussed based on our structural analysis. ©2006 The Physical Society of Japan. 2 c c
  • Kenji Iwase, Takashi Kamiyama, Yumiko Nakamura, Kazuhiro Mori, Masao Yonemura, Stefanus Harjo, Toru Ishigaki, Etsuo Akiba
    Materials Transactions 47 2 271 - 274 2006年02月 
    The average and local structures in the (Ti Cr Mo )-D system have been investigated by neutron powder diffraction and total neutron scattering. From the result of neutron powder diffraction, the crystal structure of the system was found to change from CaF -type structure to bcc structure in the hydrogen desorption process, and the D atoms occupy the tetrahedral (T) sites in both CaF -type and bcc phases. The D-Ti, D-Cr, D-Mo and D-D correlation lengths and the nearest neighbor coordination number around a D atom have been obtained by the RDF analysis of total neutron scattering data. The D atoms occupy the T sites surrounded mainly by the Ti atoms in both CaF -type and bcc phases. © 2006 The Japan Institute of Metals. 0.45 0.35 0.20 2 2 2
  • Kazuhiro Mori, Yuuya Shiraishi, Takashi Sato, Kenji Iwase, Masaaki Sugiyama, Shinichi Takata, Toshiya Otomo, Keiji Itoh, Masao Yonemura, Fumihito Shikanai, Tuerxun Wuernisha, Dyah Sulistyanintyas, Koji Oishi, Masayoshi Kawai, Takashi Kamiyama, Toshiharu Fukunaga
    TRANSACTIONS OF THE MATERIALS RESEARCH SOCIETY OF JAPAN, VOL 31, NO 3 31 3 763 - 766 2006年 [査読有り][通常論文]
     
    The hydration kinetics of tricalcium silicate (Ca3SiO5) has been studied by time-of-flight neutron powder diffraction (TOF-NPD) and time-of-flight small-angle neutron scattering (TOF-SANS). During the hydration process, the hydrated Ca3SiO5 was quantified using the additional standard method with Si, and then we could obtain the time dependence of the hydration degree of Ca3SiO5. It was validated that the hydration of Ca3SiO5 proceeds in three different stages: induction period, nucleation and growth period and diffusion-limited period. In the SANS experiments, the drastic variation in the SANS curve was observed over induction time (t(i)similar to 6 h). From these results, we point out that the hydration rate is strongly associated with the surface roughness of Ca3SiO5 arising from the creation of hydration products. Furthermore, the four-parameter equation based on the Avrami model was applied to describe the hydration kinetics of Ca3SiO5. The n-value that characterizes the hydration process was estimated as similar to 2.6.
  • Shunsuke Nishimoto, Motohide Matsuda, Stefanus Harjo, Akinori Hoshikawa, Takashi Kamiyama, Toru Ishigaki, Michihiro Miyake
    Journal of the European Ceramic Society 26 4-5 725 - 729 2006年 
    A protonated n = 1 Ruddlesden-Popper compound, HLaTiO (DLaTiO ), has been prepared by an ion-exchange reaction of Na ions in NaLaTiO with H (D ) ions, and its structure has been analyzed in order to clarify the location of protons in the interlayer space, using powder neutron diffraction data. The crystal structure of DLaTiO belongs to the same space group, P4/nmm, as that of parent NaLaTiO , and the D atoms were found to statistically occupy eight equivalent sites around an apical O atom of a TiO octahedron in the interlayer, which are different from the Na atom sites in NaLaTiO . A comparison between DLaTiO and NaLaTiO indicated that the protonation brought the shrinkage of the interlayer space and the distortion of the TiO octahedron. © 2005 Elsevier Ltd. All rights reserved. 4 4 4 4 4 6 4 4 4 6 + + +
  • Hajime Sagayama, Yusuke Wakabayashi, Hiroshi Sawa, Takashi Kamiyama, Akinori Hoshikawa, Stefanus Harjo, Kentaro Uosato, Ajay K. Ghosh, Masashi Tokunaga, Tsuyoshi Tamegai
    AIP Conference Proceedings 850 643 - 644 2006年 
    CaAlSi is a superconductor with the AlB -like structure. In this system, there are two types of multi-stack structures along c-axis, 5-fold structure and 6-fold structure. The 5-fold structure sample and the 6-fold structure sample have T of 6 K and 8 K, respectively. To investigate the correlation of stack structure with the superconductivity, we determined the crystal structures accurately using synchrotron radiation X-ray diffraction and neutron diffraction measured at KEK. Al and Si atoms form slightly corrugated honeycomb layers and those are ordered in both stack structures. The difference of stacking structure is caused by phase relation among Al-Si layers. © 2006 American Institute of Physics. 2 C
  • Yoshiaki Kiyanagi, Takashi Kamiyama, Toshiyuki Nagata, Fujio Hiraga
    ADVANCED NONDESTRUCTUVE EVALUATION I, PTS 1 AND 2, PROCEEDINGS 321-323 1663 - 1666 2006年 [査読有り][通常論文]
     
    Neutron imaging using a pulsed neutron time-of-flight method can give an energy dependent transmission image, namely, spectroscopic image. This image includes the structure information if the sample is coherent scatterer. Here, two examples are introduced. First, we obtained the transmission image of a welded sample of SS304 and 308. Change of the crystal structure depending on the position was observed. Furthermore, we measured spatial dependent transmission of SS samples treated in different ways, surface treatment and whole body treatment. There were almost no spatial dependent change, but the cross section change was found between surface and whole body treatment samples. It was suggested that this might be due to the difference of a grain size. These results demonstrated that the spectroscopic imaging using a pulsed neutron source is a useful tool for material characterization.
  • K. Iwase, Y. Nakamura, K. Mori, S. Harjo, T. Ishigaki, T. Kamiyama, E. Akiba
    Journal of Alloys and Compounds 404-406 SPEC. ISS. 99 - 102 2005年12月08日 
    We investigated that heat treatment condition, hydrogen absorption-desorption properties and crystal structure of Ti-(55-x)Cr-x Mo alloys by the use of X-ray diffraction (XRD) and PCT measurement. We found that the quenching treatment was effective to synthesize bcc single phase alloys in comparison with annealing treatment. The lattice parameter, a, of bcc phase in the quenched alloys showed linear relationship with increasing the Mo content. The as-cast alloys had a sloping plateau, while the quenched alloys had a flat plateau. The alloys showed the equilibrium pressure increased with increasing the Mo content. The hydrogen reversible capacity of the alloys reached 1.33-1.39-H/M (2.34-2.68 mass%) under hydrogen pressure 8.0 MPa at 313 K. © 2005 Elsevier B.V. All rights reserved.
  • 池田 圭太, 友田 陽, 鈴木 淳市, 盛合 敦, 神山 崇
    鐵と鋼 : 日本鐡鋼協會々誌 91 11 822 - 827 社団法人日本鉄鋼協会 2005年11月01日 
    Small angle neutron scattering (SANS) and in situ neutron diffraction during tension test were performed for three austenitic stainless steels with different concentrations of nitrogen. The existence of nano-sized cluster composed of nitrogen and alloy element atoms is suggested by SANS. The cluster seems to make dislocation line planar and hinder cross slip. Because of such a characteristic dislocation motion, the stress relaxation at the grain boundaries becomes difficult leading to enlarge the intergranular stress in nitrogen bearing steels. The in situ neutron diffraction reveals clearly that the intergranular stress increases with increasing of nitrogen concentration.
  • 鬼柳善明, 加美山隆, 平賀富士夫, 松林政仁
    第9回黎明研究報告会報告集 JAERI-Conf 2005-011 155 - 160 2005年09月 [査読無し][通常論文]
  • Masahiro Kajitani, Motohide Matsuda, Akinori Hoshikawa, Stefanus Harjo, Takashi Kamiyama, Toru Ishigaki, Fujio Izumi, Michihiro Miyake
    Chemistry of Materials 17 16 4235 - 4243 2005年08月09日 
    The crystal structures of LaGaO , LaGa Mg O , and La Sr Ga Mg O have been investigated by high-temperature neutron powder diffraction in order to clarify a mechanism for high oxide ion conduction properties in LaGaO -based compounds. Parent phase LaGaO crystallized in the orthorhombic (Pbnm) up to 150°C and the rhombohedral (R3c) at between 160 and 800 °C. LaGa Mg O crystallized in the orthorhombic (Ibmm) up to 340°C and the rhombohedral (R3̄c) at between 350 and 800°C. On the other hand, La Sr Ga Mg O crystallized in the monoclinic (I2/a) up to 400°C and the rhombohedral (R3̄c) at between 410 and 800°C. The correlations between the crystal structures and conduction properties of LaGaO -based materials were discussed on the basis of the analytical results. © 2005 American Chemical Society. 3 0.9 0.1 2.95 0.9 0.1 0.9 0.1 2.9 3 3 0.9 0.1 2.95 0.9 0.1 0.9 0.1 2.9 3
  • Kiyanagi, Y, Kamiyama, T, Ohnuma, S, Hiraga, F, Uchida, T, Ebinuma, T, Narita, H, Bennington, HS M
    Proceedings of the 5th International Conference on Gas Hydrates 2005年07月01日 [査読無し][通常論文]
  • T Kamiyama, J Ito, H Noda, H Iwasa, Y Kiyanagi, S Ikeda
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 542 1-3 258 - 263 2005年04月 [査読有り][通常論文]
     
    Neutron resonance absorption spectroscopy (N-RAS) associated with computer tomography was applied to thermometry for an inhomogeneous bulk object. This new method provides two-dimensional distributions of nuclide temperatures on the planar cross-section of an object as information from remote-sensing analysis. The experimental result showed good agreement with the actual temperature distribution inside the object, and the simulation of the experiment correctly reproduced the result. For greater accuracy, we need to achieve finer spatial resolution and better statistical reliance on N-RAS. The development of this novel approach has links to new industrial applications utilizing neutrons for remote sensing and non-destructive thermometry. (c) 2005 Elsevier B.V. All rights reserved.
  • Y Kiyanagi, K Mizukami, T Kamiyama, F Hiraga, H Iwasa
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 542 1-3 316 - 319 2005年04月 [査読有り][通常論文]
     
    Neutron radiography using a pulsed neutron source can give transmission spectra that reflect the structure of the neutron cross-section of the object. At low-energy region, we can see Bragg cutoff, whose position and shape depend on the material. We have developed a new detector to observe such features of the transmission spectra efficiently. We used Li-glass pieces to achieve a high-count rate. The pixel size of the detector is not so good, about 1.7 mm x 1.7 mm, but the maximum count rate is very high, about 0.24 M cps/pixel. We performed a transmission experiment of the welded piece of stainless steel to examine the usefulness of the detector and also the time-of-flight transmission method at a relatively low intensity spallation source, KENS. From the difference of Bragg cutoff of the transmission spectra, we could determine the welded position, which could not be recognized with the naked eye. This suggests the possibility of observation of lattice deformation in a welded place. (c) 2005 Elsevier B.V. All rights reserved.
  • Y Kiyanagi, H Noda, S Yasui, Y Ogawa, J Ito, T Kamiyama, S Ikeda
    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY 42 3 263 - 266 2005年03月 [査読有り][通常論文]
     
    The eV-region pulse data of neutrons emitted from a moderator at a pulsed neutron source are important for scattering experiments using eV region neutrons. Therefore, we measured the pulse data of neutrons from the H2O thermal moderator at KENS, using a neutron resonance absorption spectrometer (N-RAS) because it can give the pulse information due to the fact that it includes pulse shape information in a form of convolution with the resonance spectrum. We also performed a simulation calculation for the pulse shapes. It was found that the pulse widths obtained experimentally were proportional to E-0.48, which result is almost equal to those of the simulation, and there existed little difference in widths compared with those evaluated by using the slowing down theorem in an infinite medium having mass number 1.
  • Y Kiyanagi, N Sakamoto, H Iwasa, T Kamiyama, F Hiraga, S Sato, H Sagehashi, T Ino, M Furusaka, J Suzuki, A Gorin, Manuilov, I, A Ryazantsev, K Kuroda, K Sakai, F Tokanai, H Miyasaka, T Adachi, T Oku, K Ikeda, S Suzuki, K Morimoto, HM Shimizu
    IEEE TRANSACTIONS ON NUCLEAR SCIENCE 52 1 371 - 374 2005年02月 [査読有り][通常論文]
     
    We are developing a fiber type two-dimentional (2-D) position-sensitive detector having a spatial resolution less than 0.5 mm in order to use it in the time-of-flight (TOF) measurements. The detector performance was examined, and some experiments on the TOF radiography were performed using this detector. The results indicated that the detector could be applied successfully to the TOF measurement and that the TOF radiography was very useful since it gave more informative data than those obtained by the conventional radiography using a broad energy band.
  • M Nagao, C Pitteloud, T Kamiyama, T Otomo, K Itoh, T Fukunaga, R Kanno
    JOURNAL OF THE ELECTROCHEMICAL SOCIETY 152 7 E230 - E237 2005年 [査読有り][通常論文]
     
    Lithium insertion in interstitial space was investigated for electrolytic manganese dioxide (EMD), gamma-MnO2, as a new cathode reaction in lithium battery. Its structure and proton dehydration mechanism were characterized by X-ray and neutron diffraction-pattern simulation. The heat-treatment process activated the EMD as insertion electrodes and caused dehydration with structural changes, which were described by modifications in stacking sequence of the ramsdellite (+R) to pyrolusite (+P), and their twinning types (-R and -P). By the heat-treatment of EMD, the -R ratio decreased and the -P increased with increasing temperature, and finally the structure transformed to +P above 400 degrees C. The void size was determined by small-angle neutron scattering and decreased with the treatment temperature. The total neutron diffraction indicated two types of protons with H-O length of 1.0 and 1.9 angstrom, which corresponds to the "Ruetschi" and "Coleman" protons, respectively. The former proton situated in the Mn4+ vacant site and the latter in the center of the tunnel. Lithium insertion properties depended on both the structures and the amount of proton. Dehydration of the Ruetschi proton without destroying interstitial space improved the lithium insertion capacities as reversible cathodes. (c) 2005 The Electrochemical Society. All rights reserved.
  • K. Mori, K. Yatsuyanagi, K. Oishi, T. Fukunaga, T. Kamiyama, T. Ishigaki, A. Hoshikawa, S. Harjo, K. Iwase, K. Itoh, M. Kawai
    Journal of Neutron Research 13 1-3 163 - 167 2005年 
    Structure refinements have been carried out on the pure tricalcium silicate (C S) and the hydrated C S with the D O-C S mass ratio, which is 0.5, using neutron powder diffraction (NPD). The multi-phase Rietveld analysis of the hydrated C S revealed the coexistence with the Ca(OD) (trigonal phase) and the unhydrated C S (triclinic one). The Ca(OD) phase was hardly observed on the NPD patterns in the first ∼6 h of hydration, while the several Bragg reflections of Ca(OD) appeared drastically from ∼6 to ∼24 h, and then the hydration reaction rate was gradually suppressed. We could apply the Avrami-model to the initial hydration reaction process of C S. © 2005 Taylor & Francis Ltd. 3 3 2 3 3 2 3 2 2 3
  • High resolution chopper spectrometer at J-PARC
    S. Itoh, K. Ohoyama, T. Kamiyama, T. Otomo, K. Nakajima, R. Kajimoto, T. Yokoo, K. Kuwahara, K. Tomiyasu, O. Yamamuro, S. Muto, H. Sagehashi, J. Suzuki, K. Ueno, T. Ino
    Proceedings of the 17th Meeting on International Collaboration of Advanced Neutron Sources 1019 - 1028 2005年 [査読無し][通常論文]
  • S. Itoh, K. Ohoyama, T. Otomo, K. Nakajima, K. Kuwahara, R. Kajimoto, T. Kamiyama, O. Yamamuro
    Journal of Neutron Research 13 1-3 59 - 62 2005年 [査読有り][通常論文]
     
    A designed performance of the high resolution chopper spectrometer of which construction has been proposed at J-PARC to study dynamical properties of materials showing a wide spatial and temporal correlations is summarized. © 2004 Taylor & Francis Ltd.
  • T. Kamiyama, H. Noda, J. Ito, H. Iwasa, Y. Kiyanagi, S. Ikeda
    Journal of Neutron Research 13 1-3 97 - 101 2005年 [査読有り][通常論文]
     
    We applied the method of neutron resonance absorption spectroscopy to thermometric measurements of a bulk object. Through an analysis of the resonance absorption spectrum of imbedded neutron-absorbing nuclides, the "effective temperature", which coincides with the actual local temperature near and above room temperature, can be determined. If a thermal gradient exists, computed tomography techniques could be used in conjunction with the analysis for a reconstruction of the temperature distribution over a planar cross-sectional area. We find that the experimental data agree with the temperature profile calculated from the heat conduction equations. The measurements were carried out using the neutron resonance absorption spectrometer DOG of KENS, Japan. The overall results demonstrated the feasibility of this method for industrial applications where remote-sensing and non-destructive temperature mapping of bulk objects is necessary. © 2005 Taylor & Francis Ltd.
  • M Oi, M Konno, H Iwasa, T Kamiyama, M Furusaka, Y Kiyanagi
    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY 41 12 1138 - 1144 2004年12月 [査読有り][通常論文]
     
    We experimentally studied the premoderator effect on the neutronic performance of decoupled hydrogen moderators for a pulsed neutron source. Two reflector systems were examined: graphite as a moderating-type reflector and lead as a non-moderating-type reflector. The premoderator materials studied were H2O and D2O. Decoupler materials were Cd and B4C. We measured the neutron energy spectra and emission time distributions. In the case of the graphite reflector system, neutron intensity increased by at most 7% for a Cd decoupled moderator. On the other hand, in the case of the lead reflector system, neutron intensity increased by about 73% for a Cd decoupler by using a D2O premoderator. It was confirmed that the D2O premoderator is more effective than the H2O premoderator. Concerning the pulse characteristics, the premoderator strongly increased the pulse peak intensity, which is a very preferable characteristic for the pulsed neutron sources since it does not cause any deterioration of the energy resolution in time-of-flight measurement. We compared these results with simulation calculations. Experimental and calculated results showed almost the same trends with respect to premoderator thickness but relative intensity gain with premoderator was overestimated by 10 to 20%.
  • Kazuhiro Mori, Toshiharu Fukunaga, Koji Shibata, Kenji Iwase, Stefanus Harjo, Akinori Hoshikawa, Keiji Itoh, Takashi Kamiyama, Toru Ishigaki
    Physica B: Condensed Matter 352 1-4 147 - 155 2004年10月30日 
    Structural characteristics of Fe-doped LaGaO were studied by differential scanning calorimeter, neutron and high-temperature X-ray powder diffraction measurements. It was found that a phase transition temperature increases in proportion to an amount of Fe. The crystal structure could be described as a low-temperature orthorhombic phase (Pnma) and a high-temperature rhombohedral one (R3c), respectively. Lattice parameters and bond lengths between M (=Ga/Fe) and O are monotonically expand with increasing Fe-content on both orthorhombic and rhombohedral phases. This means that a substitution of Ga with Fe leads to an electronic configuration of t e (high-spin state, HS). © 2004 Elsevier B.V. All rights reserved. 3-δ 2g g 3+ 3+ 3 2
  • Y Kiyanagi, G Koike, H Iwasa, F Hiarga, T Kamiyama
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 529 1-3 87 - 89 2004年08月 [査読有り][通常論文]
     
    A multi-capillary fiber device is used for transporting the neutrons. For a pulsed neutron source the energy dependence is important, but experimental results have not agreed with simulation results. Therefore, we performed experimental studies and simulation calculations to get wavelength-dependent information at several capillary diameters and also at several curvature of the fibers. The experimental results showed that from 30 to 70 mum capillary fibers had no systematic difference in the transmission intensity and there exist difference between the experimental and the simulation results. It is found that the difference was partially explained by introducing a wave-like distortion to the fiber form. (C) 2004 Elsevier B.V. All rights reserved.
  • J Suzuki, T Oku, T Adachi, HM Shimizu, Y Kiyanagi, T Kamiyama, F Hiraga, H Iwasa, K Sato, M Furusaka
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 529 1-3 120 - 124 2004年08月 [査読有り][通常論文]
     
    Steady sextupole magnet has a function as neutron beam focusing device with chromatic aberration. In order to solve the chromatic aberration we have developed a pulsed sextupole electromagnet for focusing pulsed neutrons. In the magnet, the gradient of magnetic field is controlled in time to the neutron passage through the magnet, as faster neutrons feel a stronger magnetic field gradient than slower neutrons. The idea, design, current status and application of the magnet are described. (C) 2004 Elsevier B.V. All rights reserved.
  • K Mizukami, S Sato, H Sagehashi, S Ohnuma, M Ooi, H Iwasa, F Hiraga, T Kamiyama, Y Kiyanagi
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 529 1-3 310 - 312 2004年08月 [査読有り][通常論文]
     
    We have developed a pixel-type two-dimensional position sensitive Li-glass neutron detector for high rate application, which would be useable for time-of-flight radiography, namely transmission spectroscopy. The pieces of Li-glass were attached directly to a 8 x 8 channel photo multiplier. We measured its performance at KEK and Hokkaido University. The count rate of this detector was found to be about 8.3 Mcps/cm(2) (240 Kcps per pixel). The efficiency of the detector corrected for the effective detection area is 100% over 9 Angstrom and 95% at 3 Angstrom. The difference in the count rate of each pixel was very small, less than 2%. (C) 2004 Elsevier B.V. All rights reserved.
  • T Kamiyama, S Hosokawa, AQR Baron, S Tsutsui, K Yoshida, WC Pilgrim, Y Kiyanagi, T Yamaguchi
    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 73 7 1615 - 1618 2004年07月 [査読有り][通常論文]
     
    The dynamic scattering factor S(Q, omega) was measured by high-resolution inelastic X-ray scattering using intense X-rays from a third-generation synchrotron radiation facility. The observed spectra demonstrate the existence of longitudinal propagating modes at small Q values, although the collective excitations are highly damped (not overdamped) as in the classical van der Waals liquid Ar. The Q-omega relation of the excitation shows a positive dispersion of about 37%, much larger than in liquid metals but similar to that in liquid Ar. The collective dynamics of liquid CCl4 at small Q values can be interpreted in the framework of classical dense liquids.
  • T. Kamiyama, Y. Kiyanagi, T. Horikawa, H. Iwasa, T. Uchida, T. Ebinuma, H. Narita, S. M. Bennington
    PHYSICA B-CONDENSED MATTER 350 1-3 E395 - E398 2004年07月 [査読有り][通常論文]
     
    Methane hydrate is a possible candidate material for use as a cold neutron moderator in pulsed neutron sources. Our aim was to perform inelastic neutron scattering measurements with sufficient range in energy and momentum to create a scattering kernel to simulate its behavior as a moderator material. Measurements were made on samples of D2O-CH4 and H2O-CH4 at 12K covering a range up to 500meV and 28 angstrom(-1). These data clearly shows the almost free recoil of the CH4 rotational and vibrational modes and confirms that the dynamics of the ice and methane are largely decoupled on the energy scales that we are studying. From these initial measurements we can conclude that methane hydrate will be a good moderator over a wide range of neutron energies. We are now able to produce models of sufficient quality to create scattering kernels for the Monte-Carlo simulation codes that are used to design neutron sources. (C) 2004 Elsevier B.V. All rights reserved.
  • Y. Kiyanagi, T. Tatsumi, H. Iwasa, F. Hiraga, T. Kamiyama
    PHYSICA B-CONDENSED MATTER 350 1-3 E691 - E693 2004年07月 [査読有り][通常論文]
     
    Intensities of neutrons transported by a neutron focusing device with the multi-capillary fibers were measured as a function of neutron energy. Reflections in the capillary were dominant at an energy less than about 1.0 meV. The effect of capillary diameter was also investigated, and at higher energy of several meV the intensity from a device with narrower capillary fibers gave a higher intensity than with wider one. At low-energy the difference was insignificant. (C) 2004 Elsevier B.V. All rights reserved.
  • A. Purwanto, E. Kartini, T. Kamiyama, A. Hoshikawa, S. Harjo, M. F. Collins, S. Purnama
    Solid State Ionics 171 1-2 113 - 119 2004年06月30日 
    We report crystalline phases in the melt-quenched (AgI) - (NaPO ) and (AgI) -(NaPO ) superionic composites at room temperature as studied by VEGA powder neutron diffraction of KEK. (AgI) -(NaPO ) contains γAgI and βAgI with a 70:30 ratio, which is similar to that found in pure AgI. On the other hand, (AgI) - (NaPO ) contains AgI and Ag IP O with a 53:47 ratio, without any indication of βAgI presence. Due to the overall broad line widths and the hexagonal-related orthorhombic unit cell of Ag IP O , VEGA was indispensable to probe its existence in (AgI) -(NaPO ) at room temperature. The disappearance of βAgI in (AgI) -(NaPO ) in favour of Ag IP O containing more oxygens indicating that the phosphate chains have been oxidized to P O pairs of phosphate tetrahedra. © 2004 Elsevier B.V. All rights reserved. 0.8 3 0.2 0.7 3 0.3 0.8 3 0.2 0.7 3 0.3 5 2 7 5 2 7 0.7 3 0.3 0.7 3 0.3 5 2 7 2 7
  • Yuji Noguchi, Masaru Miyayama, Kenichi Oikawa, Takashi Kamiyama
    Journal of Applied Physics 95 8 4261 - 4266 2004年04月15日
  • Y Kiyanagi, T Kamiyama, H Iwasa, F Hiraga
    ADVANCES IN NONDESTRUCTIVE EVALUATION, PT 1-3 270-273 1371 - 1375 2004年 [査読有り][通常論文]
     
    Neutron radiography using a time-of-flight method will become important, since high. power spallation neutron sources are under construction in Japan and the USA. The time-of-flight radiography is still at beginning stage but has many useful features as non-destructive test tool. Here, we demonstrate examples of the time-of-flight radiography to indicate its usefulness. As an application of the resonance structure of the neutron cross-section, temperature measurement is also introduced. They will be very useful for one of the industrial application of the neutron.
  • T. Omura, K. Itoh, C. Moriyoshi, S. Ikeda, T. Kamiyama, S. F. Parker
    Journal of Neutron Research 12 4 287 - 290 2004年 [査読有り][通常論文]
     
    Incoherent inelastic neutron scattering spectra of antiferroelectric Cu(HCOO)2·4H2O and its isomorphous Cu(HCOO)2·4H2O were measured. Comparing the spectra between these crystals, we extracted the H2O-related modes from many other modes. We find new peaks in the energy range of the H2O librational modes. The spectra in this range become broad above the phase transition temperature indicating that the antiferroelectric dynamics are dominated by the order-disorder of the H2O molecules induced by the out-of-plane hydrogen motion. © 2004 Taylor & Francis Ltd.
  • Mori K, Kamiyama T, Kobayashi H, Oikawa K, Otomo T, Ikeda S
    Journal of the Physical Society of Japan 72 8 2024 - 2028 2003年08月 [査読有り][通常論文]
     
    A weak distortion of a [FeO6] octahedron was observed in hexagonal BaFeO2.91 at around 180 K by neutron powder diffraction. The occurrence of a weak distortion is consistent with the results of Mossbauer measurements, which indicated a decrease in the Fe4+ concentration below 170 K. We strongly suggest that the weak distortion of a [FeO6] octahedron results from a charge-disproportionation phenomenon, 2Fe(4+) --> Fe<4+tau>+ + Fe<4-tau>+, where 0 < tau less than or equal to 1. Below 130K, BaFeO2.91 orders antiferromagnetically and the propagation vector is <00 0.45c*> at 50K.
  • K Itoh, Y Miyahara, S Orimo, H Fujii, T Kamiyama, T Fukunaga
    JOURNAL OF ALLOYS AND COMPOUNDS 356 608 - 611 2003年08月 [査読有り][通常論文]
     
    The total and inelastic neutron scattering measurements were employed in order to get more information on the local structure of nanocrystalline graphite prepared by mechanical milling under D-2 gas atmosphere. In the RDF(r) for the sample after 50 h of milling, newly grown peak around 0.154 nm was found at the larger r side of the first nearest peak corresponding to the C-C correlation. The distance 0.154 nm of the C-C correlation is attributed to 4-fold bonding. Moreover, the inelastic neutron scattering peak observed in the 160-190 meV region for the samples after 20 h of milling indicates new emergence of sp(3) bonding. The results apparently indicate that terminating D atoms at the edges of the nano-lattice plane of graphite create the new sp(3) bonding of C atoms during the milling process under D, gas atmosphere. (C) 2002 Elsevier B.V. All rights reserved.
  • T Oku, K Sakai, T Adachi, K Ikeda, HM Shimizu, R Maruyama, M Hino, S Tasaki, Y Kiyanagi, T Kamiyama, H Iwasa, K Sasaki, T Ino, M Furusaka, D Yamazaki, J Suzuki, T Ebisawa
    PHYSICA B-CONDENSED MATTER 335 1-4 226 - 229 2003年07月 [査読有り][通常論文]
     
    We have developed a radio-frequency gradient spin flipper for the effective utilization of the focused and polarized neutron beam obtained using a superconducting sextupole magnet developed for the practical application in the neutron-scattering experiment. The flipper was designed to be effective for the neutron beam with wavelengths longer than 4 Angstrom and the cross section of 50 mm in diameter. The flipper was tested using polarized,cold neutrons, and good performance was obtained. (C) 2003 Elsevier Science B.V. All rights reserved.
  • T Itami, S Munejiri, T Masaki, H Aoki, Y Ishii, T Kamiyama, Y Senda, F Shimojo, K Hoshino
    PHYSICAL REVIEW B 67 6 064201/1 - 064201/12 2003年02月 [査読有り][通常論文]
     
    The structure of liquid Sn was studied by neutron scattering experiments in the widest temperature range that was ever performed. Though, on increasing temperature, the existence of the shoulder in the structure factor, S(Q), becomes less clear in the change of the overall shape of the S(Q), the structure related to this shoulder seems to be present even at 1873 K. The first-principle molecular-dynamics (FPMD) simulation was performed for the first time for liquid Sn by using the cell size of 64 particles. The calculated results well reproduced S(Q) obtained by the neutron experiments. The angle distribution, g((3))(theta,r(c)), was evaluated for the angle between vectors from centered atom to other two atoms in spheres of cutoff radii r(c)'s. The g((3))(theta,r(c)) shows that, with the decrease of r(c) from 0.4 to 0.3 nm, a rather sharp peak around 60 degrees disappears and only a broad peak around 100 degrees remains; the former peak may be derived from the feature of the closely packed structures and the latter one is close to the tetrahedral angle of 109 degrees. In addition, the coordination number, n, of liquid Sn counted within the sphere of r(c)=0.3 nm is found to be 2-3 and does not change with the increase of temperature even up to 1873 K. These facts indicate that at least the fragment of the tetrahedral unit may be essentially kept even at 1873 K for liquid Sn. For comparison, the FPMD simulation was performed for the first time also for liquid Pb. No sign of the existence of the tetrahedral structure was observed for liquid Pb. Unfortunately, the self-diffusion coefficients, D's, obtained from this FPMD for liquid Sn do not agree with those obtained by the microgravity experiments though the structure factors, S(Q)'s, are well reproduced. To remove the limitation of the small cell size of the FPMD, the classical molecular-dynamics simulations with a cell size of 2197 particles were performed by incorporating the present experimental structural information of liquid Sn. Obtained D's are in good agreement with the microgravity data.
  • M Kawal, M, Furusaka T Ino, S. Itoh, N. Torikai, T. Kamiyama, M. Ooi
    KENS REPORT-XIV 2001-2002, KEK Pregress Report 2003-6 12 - 15 2003年 [査読無し][通常論文]
  • T. Kamiyama, T. Omura, H. Iwasa, Y. Kiyanagi, S. Ikeda
    KENS REPORT-XIV 2001-2002, KEK Pregress Report 2003-6 22 - 23 2003年 [査読無し][通常論文]
  • Y. Kiyanagi, M. Ooi, H. Iwasa, F. Hiraga, T. Kamiyama, M. Furusaka, M. Kawai, T.Ino
    KENS REPORT-XIV 2001-2002, KEK Pregress Report 2003-6 72 - 74 2003年 [査読無し][通常論文]
  • K. Itoh, T. Kamiyama, T. Fukunaga
    KENS REPORT-XIV 2001-2002, KEK Pregress Report 2003-6 226 - 227 2003年 [査読無し][通常論文]
  • T. Kamiyama, T. Masaki, T. Itami, Y. Kiyanagi
    KENS REPORT-XIV 2001-2002, KEK Pregress Report 2003-6 247 - 249 2003年 [査読無し][通常論文]
  • K. Ohoyama, F. Iga, T. Takabatake, S. Itoh, T. Kamiyama
    KENS REPORT-XIV 2001-2002, KEK Pregress Report 2003-6 258 - 258 2003年 [査読無し][通常論文]
  • K Ohoyama, H Onodera, K Indoh, T. Kamiyama, S. Itoh, Y. Yamaguchi
    KENS REPORT-XIV 2001-2002, KEK Pregress Report 2003-6 259  2003年 [査読無し][通常論文]
  • Inelastic neutron scattering of liquid Sn: Nature of coherent quasielastic neutron scattering
    T. Kamiyama, T.Itami, T. Masaki
    Modeling and Precise Experiments of Diffusion Phenomena in Melts Under Microgravity: Annual Reports 2001 NASDA-TMR-020025E 2002年12月27日 [査読無し][通常論文]
  • T. Ino, N. Torikai, S. Itoh, T. Kamiyama, M. Furusaka, Y. Kiyanagi, M. Ooi, T. Fukunaga, M. Kawai
    Applied Physics A: Materials Science & Processing 74 s43 - s45 2002年12月01日
  • SM Mamun, M Herstedt, K Oikawa, T Gustafsson, T Otomo, M Furusaka, T Kamiyama, H Sakaebe, K Edstrom
    APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 74 SUPPL.II S1028 - S1030 2002年12月 [査読有り][通常論文]
     
    High-resolution neutron powder diffraction (NPD) and small-angle neutron scattering (SANS) experiments were carried out on several different types of carbon used as anodes in secondary lithium-ion batteries. The materials selected were Swedish natural graphite (crude and jet-milled), meso-carbon microbeads, and hard carbon. SANS data revealed a nanopore structure in hard carbon. Absolute calibration of SANS data for hard carbon was done to calculate the volume fraction of the nanopores. Estimation of the hexagonal (A B) and the rhombohedral (ABC) phase content in Swedish natural graphite from NPD data revealed that the jet milling increased the amount of the ABC phase. All these results are discussed to explain the electrochemical performances and structure-property relations of different carbon anode materials.
  • T Oku, T Adachi, K Sakai, HM Shimizu, K Sasaki, H Iwasa, T Kamiyama, Y Kiyanagi, T Ino, M Furusaka, J Suzuki, M Hino, S Tasaki, T Ebisawa
    APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 74 S261 - S263 2002年12月 [査読有り][通常論文]
     
    A sextupole magnetic field exerts focusing and defocusing effects on neutrons depending on the neutron-spin states. By combining both effects, we can realize a magnetic doublet which enables control of the neutron-beam size and divergence with high degrees of freedom. We constructed a magnetic doublet with two permanent sextupole magnets and a spin flipper, and experimentally investigated its function using pulsed neutrons.
  • Stefanus Harjo, Yo Tomota, Syuki Torii, Takashi Kamiyama
    Materials Transactions 43 7 1696 - 1702 2002年07月 
    Residual thermal phase elastic strains in rod specimens and powders with particle size from 150 to 250 μm of α-γ Fe-Cr-Ni alloys quenched from 1273 to 273 K, were measured by means of a high-resolution neutron powder diffractometer using a time-of-flight (TOF) method. Diffraction patterns were analyzed by the Rietveld method and the single-peak method. Residual thermal phase strains obtained in the rod specimens or the powders from the both methods are positive, i.e., tensile, for austenite (γ) phase and negative for ferrite (α) phase, being consistent with the prediction from the difference in thermal expansion coefficients of the constituent phases. The Rietveld analysis combined with the TOF method is considered to give the most reliable results of the average thermal phase strain. The results by the single-peak analysis suggest that thermal phase strain shows [hkl] dependence; the absolute value of thermal phase strain is decreased with increasing of the Young modulus along the [hkl] direction.
  • Y Madokoro, O Yamamuro, H Yamasaki, T Matsuo, Tsukushi, I, T Kamiyama, S Ikeda
    JOURNAL OF CHEMICAL PHYSICS 116 13 5673 - 5679 2002年04月 [査読有り][通常論文]
     
    The heat capacities of the glassy and liquid states of three lithium chloride aqueous solutions (LiCl.4H(2)O,LiCl.6H(2)O,LiCl.7.5H(2)O) were measured with an adiabatic calorimeter in the temperature range 5-340 K; the crystalline state was also measured for LiCl.4H(2)O. For all of the glassy samples, a large non-Debye excess heat capacity appeared below 30 K. The neutron scattering spectra of glassy LiCl.4H(2)O and LiCl.6H(2)O were measured with two spectrometers operating with different energy windows (E<20 meV and E<100 meV). A boson peak, corresponding to the excess heat capacity, appeared at around 4 meV in the S(Q,E) spectra of both glassy samples. From the analysis combining the heat capacity and neutron scattering data, the excess density of states due to the boson peak (compared with hexagonal ice) was found to be 0.10 degree of freedom per water molecule for both glassy samples. A librational peak of water molecules appeared at around 60 meV in glassy samples. This energy is about 10 meV lower than that of hexagonal and amorphous ices, indicating that the hydrogen bonds connecting water molecules are broken due to the strong coordination of water molecules to lithium ions. (C) 2002 American Institute of Physics.
  • M Kosaka, S Koiwai, Y Uwatoko, N Mori, H Onodera, K Ohoyama, H Abe, H Kitazawa, G Kido, T Kamiyama, H Noda, T Omura
    PHYSICA B-CONDENSED MATTER 312 237 - 238 2002年03月 [査読有り][通常論文]
     
    Ternary compound Ce3PbC has a simple face-centered cubic CaTiO3-type structure. We found that Ce3PbC undergoes a transition to an antiferromagnetic state at T-N = 8.4 K and shows an another transition at T-I = 5.8 K. Magnetization process exhibits multi-step metamagnetic transitions at T = 1.5 K. The observation of inelastic neutron experiments suggest that the crystalline electric field (CEF) ground state can be consider to be a doublet. This results imply that the Ce sites are influenced by tetragonal CEF interaction, even though the crystal structure is cubic. We expect that such CEF configuration plays an important role in the behavior of multi-step metamagnetic transitions. (C) 2002 Elsevier Science B.V. All rights reserved.
  • Sample Container Materials for High Temperature Neutron Scattering Experiment
    T. Kamiyama, H. Aoki, T. Masaki, S. Munejiri, S. Takeda, Y. Ishii, T. Itami
    NASDA Technical Memorandum NASDA-TMR-010019E 79 - 84 2002年 [査読無し][通常論文]
  • Neutron Scattering Analysis of Liquid Structures of Sn and Ge in Wide Temperature Range
    H. Aoki, T. Masaki, S. Munejiri, Y. Ishii, T. Kamiyama, T. Itami
    NASDA Technical Memorandum NASDA-TMR-010019E 91 - 95 2002年 [査読無し][通常論文]
  • メタンハイドレートの動的構造因子
    加美山 隆, 伊達 真二, 堀川 卓真, 高峰 潤, 岩佐 浩克, 鬼柳 善明, 成田 英夫, 海老沼 孝郎, 内田 努, S. M. Benningto
    KEK Proceedings 2002-14 58 - 67 2002年 [査読無し][通常論文]
  • H Waki, J Kawamura, T Kamiyama, Y Nakamura
    JOURNAL OF NON-CRYSTALLINE SOLIDS 297 1 26 - 30 2002年01月 [査読有り][通常論文]
     
    The frequency and temperature dependence of ac conductivity and optical absorption have been measured for four Tl-S glasses, TlS, Tl2S3, TlS2 and Tl2S5, prepared by a melt-quenching method. The ac conductivity has been measured over a frequency range 0.1 Hz to 1.8 GHz and a temperature range 190-273 K. The optical absorption was measured at room temperature over a wavelength range 200-2600 nm. We have determined the electrical and optical band gaps from the experimental results. For each glass, the electrical band gap is larger than the optical band gap and the difference increases with increasing sulfur concentration. The frequency dependence of ac conductivity varies with composition of the glasses. We suggest that these results are due to an increase of localized states in the band gap with increasing sulfur concentration. (C) 2002 Elsevier Science B.V. All rights reserved.
  • T Itami, T Masaki, H Aoki, S Munejiri, M Uchida, S Matsumoto, K Kamiyama, K Hoshino
    JOURNAL OF NON-CRYSTALLINE SOLIDS 312-14 177 - 181 2002年 [査読有り][通常論文]
     
    The self-diffusion coefficient, D-S in liquid Sri was measured by a long capillary method in the microgravity environment of the space shuttle, and the validity of a microgravity effect was confirmed for the measurements of diffusion in melts with high melting temperatures. The data of this D-S under microgravity were well reproduced by calculations, particularly in the case closely related to liquid structures. A systematic microgravity experiment is required to obtain further insight and to develop a model for diffusion in group IVB liquids. (C) 2002 Elsevier Science B.V. All rights reserved.
  • Precipitation of bismuth and bismuth sulfide in borate glasses
    H.Itoigawa, T.Kamiyama, J.Kawamura, Y.Nakamura
    Proceeding of the 6th International Conference of Molten Salts 2001年10月08日 [査読有り][通常論文]
     
    572
  • Structure Studies of Liquid Tin by Neutron Scattering Experiments and Ab initio Molecular-Dynamics Simulations
    S. Munejiri, T. Masaki, Y. Ishii, T. Kamiyama, Y. Senda, F. Shimojo, K. Hoshino, T. Itami
    Journal of the Physical Society of Japan 70 Supplements A 268 - 270 2001年03月 [査読有り][通常論文]
  • Neutron Scattering Study of Protonated and Deuterated Potassium Phosphate Glasses
    O. Yamamuro, Y. Madokoro, H. Obara, K. Harabe, T. Matsuo, T. Kamiyama, H. Fukazawa, S. Ikeda
    Journal of the Physical Society of Japan 70 Supplements A 386 - 388 2001年03月 [査読有り][通常論文]
  • K Tokuda, T Kamiyama, Y Kiyanagi, R Moreh, S Ikeda
    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS 40 3A 1504 - 1507 2001年03月 [査読有り][通常論文]
     
    A neutron resonance absorption spectrometer, DOG, has been installed at KENS, High Energy Accelerator Research Organization Neutron Source, which enables us to investigate the motions of a particular element by analyzing the line width of resonance absorption spectrum. We measured the temperature dependence of the effective temperature of Ta motion in TaS2 as well as in Ta metal using DOG. The effective temperatures extracted from the observed absorption spectrum agree well with the calculated values from the phonon density of states of Ta metal over a wide temperature range of 10 to 300 K. We also succeeded in measuring both the angular dependence and the temperature dependence of effective temperatures of Ta in a layer compound TaS2. Based on the temperature dependence of the effective temperature, the partial phonon density of states of Ta in TaS2 was discussed.
  • T Kamiyama, S Torii, K Mori, K Oikawa, S Itoh, M Furusaka, S Satoh, T Egami, F Izumi, H Asano
    EUROPEAN POWDER DIFFRACTION, PTS 1 AND 2 321-3 302 - 307 2000年 [査読有り][通常論文]
     
    A new time-of-flight (TOF) neutron powder diffractometer, Sirius, installed at Neutron Science Laboratory (KENS) of High Energy Accelerator Research Organization (KEK), has realized both the high resolution (Delta d/d = 9 x 10(-4) at its best) and the high intensity. Sirius is situated 38 m apart from a solid-methane moderator at ca. 20 K. A long flight path, required from the above resolution, demands the use of a neutron guide tube to avoid the loss of intensities. In order to intensify short-wavelength neutrons, we use 28.5 m supermirror guide tubes which enable high intensity even below lambda = 1 Angstrom A backward bank has a detective area as large as 4 m(2) To cover this area, arrays of one-dimensional He-3 position-sensitive detectors (PSD's) has been used. This new geometry also makes it possible to increase the efficiency of data collection and to improve resolution. Several examples, including Rietveld analysis of LiMn2O4, are given. High intensity at large Q has been achieved by the use of the supermirror guide. With this feature, the high-resolution total scattering by Sirius give us more detailed local structure which is indistinct by lower resolution diffractometers. Preliminary results on pair distribution function (PDF) of CeO2 are presented.
  • H. M. Shimizu, T. Oku, H. Sato, C. Otani, H. Kato, Y. Suda, H. Nakagawa, T. Kamiyama, Y. Kiyanagi, T. Wakabayashi
    Physica B: Condensed Matter 276-278 63 - 64 2000年 [査読有り][通常論文]
     
    A magnetic neutron lens, which can produce a polarized beam by transporting the spin of focused neutrons into a flat field, is presented. The lens can also be applied to the suppression of the beam divergence of spin anti-parallel neutrons. Furthermore, a multiplet magnetic lens can be switched by reversing the spin polarity using a current sheet or superconducting sheet. Hybrid optics among reflective optics, compound refractive optics and magnetic optics introduce more variety and flexibility in optimizing the design of neutron scattering experiments.
  • T Kamiyama, A Fukase, N Asahi, Y Nakamura
    JOURNAL OF MOLECULAR LIQUIDS 83 1-3 51 - 56 1999年12月 [査読有り][通常論文]
     
    The electrical conductivity and the diffusion coefficient of Li+ in the molten LiCl-LiI system have been measured as a function of composition and temperature. The electrical conductivity shows a very large negative deviation from the additive law. The diffusion coefficient of Li+ decreases with mixing of LiCl to Lit These behaviors indicate that the Li+ ions, which are main charge carriers in the system, are restricted by randomly mixed anions of different sizes, (C) 1999 Elsevier Science B.V. All rights reserved.
  • T Kamiyama, A Fukase, N Asahi, Y Nakamura
    JOURNAL OF MOLECULAR LIQUIDS 83 1-3 51 - 56 1999年12月 [査読無し][通常論文]
     
    The electrical conductivity and the diffusion coefficient of Li+ in the molten LiCl-LiI system have been measured as a function of composition and temperature. The electrical conductivity shows a very large negative deviation from the additive law. The diffusion coefficient of Li+ decreases with mixing of LiCl to Lit These behaviors indicate that the Li+ ions, which are main charge carriers in the system, are restricted by randomly mixed anions of different sizes, (C) 1999 Elsevier Science B.V. All rights reserved.
  • O Terakado, T Kamiyama, Y Nakamura
    PHYSICAL CHEMISTRY CHEMICAL PHYSICS 1 15 3561 - 3565 1999年08月 [査読有り][通常論文]
     
    The density, electrical conductivity and electron paramagnetic resonance (EPR) of the lithium-ethylamine system have been measured as a function of metal concentration and temperature. The obtained data have been discussed with emphasis on the comparison with those of alkali metal-ammonia or -methylamine solutions which have been well studied in view of the metal-nonmetal transition. Although lithium metal was dissolved into ethylamine up to 18-20 mol% metal, the observed conductivity was nonmetallic, dissimilar to the corresponding ammonia and methylamine systems. From the observed spectral linewidth of EPR it has been suggested that the hyperfine interaction with nitrogen nuclei is dominant in the electron spin-spin relaxation in the concentration range studied. The integrated intensity data of EPR have been analyzed in terms of the spin-pairing equilibrium of excess electrons in the solutions. It is concluded that excess electrons in Li-ethylamine solutions are more strongly localized than those in ammonia or methylamine solutions which exhibit electron delocalization with increasing metal concentration.
  • K Kaneko, T Kamiyama, Y Kiyanagi, T Sakuma, S Ikeda
    JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS 60 8-9 1499 - 1502 1999年08月 [査読有り][通常論文]
     
    The neutron resonance absorption experiments were performed on an ionic conductor AgI and a reference sample Ag-metal, and the effective temperatures were obtained in a wide temperature range of 20-300 K. The obtained effective temperatures in Ag-metal agree well with the calculated values from its characteristic Debye temperature of theta(D) = 225 K. In AgI an anomaly is found around 150 K where the Debye temperature of Ag-atom changes from theta(D) = 160 to 440 K, while nothing can be seen in that of I-atom. (C) 1999 Elsevier Science Ltd. All rights reserved.
  • T Kamiyama, A Miyamoto, J Kawamura, Y Nakamura, Y Kiyanagi
    JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS 60 8-9 1549 - 1552 1999年08月 [査読有り][通常論文]
     
    The quasielastic neutron scattering of concentrated solutions of LiNO3 in glycerol has been measured as a function of composition and temperature. LiNO3 is very soluble (more than 30 mol%) in the solvent and the resulting concentrated solutions become highly viscous and easy to supercool. The quasielastic neutron scattering experiments were carried out for 1-5 mol% LiNO3 solutions. From the neutron scattering cross sections the observed spectra are assigned to the individual hydrogen motions in glycerol, The observed results indicate formation of network liquids incorporated with ions. It is also shown that the ion dynamics is strongly coupled with the molecular motion of the solvent. (C) 1999 Elsevier Science Ltd. All rights reserved.
  • HM Shimizu, Y Suda, T Oku, H Nakagawa, H Kato, T Kamiyama, C Otani, H Sato, T Wakabayashi, Y Kiyanagi
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 430 2-3 423 - 434 1999年07月 [査読有り][通常論文]
     
    The magnetic focus effect of cold neutron beam was measured using a permanent sextupole magnet and a gain of more than 35 was observed. The result was analyzed with a numerical simulation. (C) 1999 Elsevier Science B.V. All rights reserved.
  • J Kawamura, H Itoigawa, T Kamiyama, Y Nakamura
    SOLID STATE IONICS 121 1-4 37 - 41 1999年06月 [査読有り][通常論文]
     
    Ag K-edge EXAFS of organic-inorganic mixed ionic conductor glasses of AgI-alkylammonium iodides were measured by varying their compositions. Although their conductivity varies from superionic conductors to insulators through a percolation threshold, no significant change was seen in local structure around mobile Ag+ ions. From a cumulant analysis of the EXAFS data, the nearest neighbor distance between Ag+ and I- is estimated to be 2.79 Angstrom and the coordination number is 4.5 +/- 0.5 irrespective of the compositions. From these results, it is concluded that the transition from superionic conductor to insulator is not due to the change in local structures but by their intermediate range structure such as connectivity of percolation networks. (C) 1999 Published by Elsevier Science B.V. All rights reserved.
  • M Hosono, J Kawamura, H Itoigawa, N Kuwata, T Kamiyama, Y Nakamura
    JOURNAL OF NON-CRYSTALLINE SOLIDS 244 1 81 - 88 1999年03月 [査読有り][通常論文]
     
    Silver ion conducting glasses composed of (AgI)(x)-(Ag2WO4)(1-x) (x=0.80-0.55) were prepared by a rapid melt quenching method. Their physical properties were investigated by X-ray, DSC, impedance and Ag-109 NMR measurements. The glass transition temperatures were in the range from 110 degrees C to 187 degrees C. The glasses show unusually high ionic conductivities of 2.5 x 10(-3) S/cm at x=0.55 and 2.3 x 10(-1) Slcm at x=0.80, which varied exponentially with increasing AgI content. Ag-109 NMR spectra also support the high mobility of silver ions in the glasses. Structures of the glasses were investigated by FTIR and W-LI edge XANES. From these results it is concluded that the tungsten ions are octahedrally coordinated by oxygen ions as in crystalline Ag2WO4 and Ag26I18W4O16, which is quite different from the structure of AgI-Ag2MoO4 glasses. (C) 1999 Elsevier Science B.V. All rights reserved.
  • T Muraki, H Hayashi, T Kamiyama, J Kawamura, Y Nakamura
    HIGH TEMPERATURE MATERIALS AND PROCESSES 18 1-2 49 - 54 1999年01月 [査読有り][通常論文]
     
    The electrical conductivity of the molten LiI-TlI system has been measured as a function of composition and temperature. The observed electrical conductivity shows a large negative deviation from the additive law. The observed chemical shifts of Tl-205 NMR in the molten LiI-TlI system increase linearly in the diamagnetic direction (high field) with increasing LiI concentration. The chemical shifts for each composition increase in the paramagnetic direction (low field) with increasing temperature. These behaviors are interpreted from the change of overlap of the Tl-I orbitals. The observed very fast spin-lattice relaxation rates of Tl-205 are attributed to the formation of paramagnetic centers such as Tl2+ in the melts.
  • O Terakado, T Kamiyama, Y Nakamura
    JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS 94 7 867 - 869 1998年04月 [査読無し][通常論文]
     
    Solutions of alkali metals in liquid ammonia show a metal-non-metal (MNM) transition at about 4 mol% metal (MPM). In this paper, we present the results of electron paramagnetic resonance (EPR) studies of sodium-ammonia solutions at 200 MHz as a function of temperature and metal concentration. It has been suggested that the transverse spin relaxation rate consists of two contributions: a hyperfine interaction with N-14 nuclei, which is dominant at lower metal concentrations, and a spin-orbit interaction, dominant at higher metal concentrations. The cross-over occurs around 1.5 MPM, a little below the bulk MNM transition point of 4 MPM. From the integrated intensity data of EPR we have examined the spin-pairing equilibrium of excess electrons in the solutions.
  • PO Maurin, JF Jal, J Dupuy-Philon, N Asahi, J Kawamura, T Kamiyama, Y Nakamura
    BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS 102 2 152 - 155 1998年02月 [査読有り][通常論文]
     
    The temperature dependences of the self-diffusion coefficient and the spin-lattice relaxation time have been studied by NMR measurements performed on a good glass former LiCl-6H(2)O. The spin-lattice relaxation rime can be separated into two relaxation processes, i.e., inter-and intramolecular processes. We have related these relaxation processes to the translational diffusion which corresponds to the primary or a-relaxation and to the local motions which are related to the beta-relaxation in glass forming systems. The results throw some light to the evolution with temperature of these relaxation processes in the LiCl-6H(2)O system over the normal liquid, supercooled liquid and glass sates.
  • O. Terakado, T. Kamiyama, Y. Nakamura
    Journal of the Chemical Society - Faraday Transactions 94 7 867 - 869 1998年 [査読有り][通常論文]
  • HM Shimizu, H Kato, T Oku, Y Suda, Y Ogawa, H Iwasa, T Kamiyama, Y Kiyanagi, T Wakabayashi
    PHYSICA B 241 172 - 174 1997年12月 [査読有り][通常論文]
     
    The focusing of a cold neutron beam in an inhomogeneous magnetic field was studied using a permanent sextupole magnet. Preliminary results show that neutron beam current density at a wavelength of 13 Angstrom was enhanced by a factor of 30 after traveling through the sextupole magnet. (C) 1998 Elsevier Science B.V. All rights reserved.
  • H Itoigawa, T Kamiyama, Y Nakamura
    JOURNAL OF NON-CRYSTALLINE SOLIDS 220 2-3 210 - 216 1997年11月 [査読有り][通常論文]
     
    Ag particles of different sizes in the nanometer range were produced in Na2O-B2O3 glasses containing Ag2O by the melt-quenching and heat-treatment method. The quenching rate was = 10(3) K s(-1) and the heat treatment was at 738 K for 2-300 h. The precipitation was dependent on diffusion limited growth. The optical absorption of Ag particles in the glasses was measured and correlated to the distribution of particle radii, The peak energy of the surface plasmon resonance was blue shifted and the width decreased with increasing average particle radius. These results are compared with previous data on similar systems. (C) 1997 Elsevier Science B.V.
  • Y Nakamura, T Kamiyama, S Itoh
    BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS 101 2 236 - 242 1997年02月 [査読有り][通常論文]
     
    From the electromotive force method, the chemical potential or activity of Tl in the molten Tl-GeTe4 system has been measured as a function of composition and temperature. The chemical potential of Tl has then been separated in terms of partial entropy and enthalpy, the both quantities showing an abrupt change from negative to positive values around the stoichiometric composition corresponding to Tl8GeTe4. The integral molar entropy and enthalpy, Delta S-m and Delta H-m, show sharp minima at the composition Tl8GeTe4, where the electrical conductivity has a sharp minimum and the thermoelectric power changes its sign. From these results it is suggested that the strong interaction between Tl and Te leads to form a chemical entity Tl2Te and the observed thermodynamic properties can be interpreted as a mixture of Tl2Te and unbounded atomic Ge and Te in the GeTe4-rich side and or atomic Ge and Tl in the Tl-rich side.
  • Y Nakamura, T Kamiyama, S Itoh
    BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS 101 2 236 - 242 1997年02月 [査読無し][通常論文]
     
    From the electromotive force method, the chemical potential or activity of Tl in the molten Tl-GeTe4 system has been measured as a function of composition and temperature. The chemical potential of Tl has then been separated in terms of partial entropy and enthalpy, the both quantities showing an abrupt change from negative to positive values around the stoichiometric composition corresponding to Tl8GeTe4. The integral molar entropy and enthalpy, Delta S-m and Delta H-m, show sharp minima at the composition Tl8GeTe4, where the electrical conductivity has a sharp minimum and the thermoelectric power changes its sign. From these results it is suggested that the strong interaction between Tl and Te leads to form a chemical entity Tl2Te and the observed thermodynamic properties can be interpreted as a mixture of Tl2Te and unbounded atomic Ge and Te in the GeTe4-rich side and or atomic Ge and Tl in the Tl-rich side.
  • H Itoigawa, T Kamiyama, Y Nakamura
    JOURNAL OF NON-CRYSTALLINE SOLIDS 210 1 95 - 100 1997年02月 [査読有り][通常論文]
     
    Bi particles of different sizes were produced in Na2O-B2O3 glasses by melt quenching and heat treatment technique. Melting temperature of Bi particles was measured by differential scanning calorimetry and X-ray diffraction. Measured melting temperatures of Bi particles are lower than bulk Bi melting temperature. Results of transmission electron microscopy were analyzed for the dependence of melting temperature on particle radius. The pressure and surface energy effect on melting temperature is estimated. The melting behavior of Bi particles in Na2O-B2O3 glasses depends on the difference in the interfacial energies between the solid particle/glass and liquid particle/glass, and liquid particle/glass, sigma(sm)-sigma(lm) which is estimated to be 255 x 10(-3) J m(-2).
  • PO Maurin, J DupuyPhilon, JF Jal, N Asahi, T Kamiyama, J Kawamura, Y Nakamura
    PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT 126 126 141 - 146 1997年 [査読有り][通常論文]
     
    The temperature behaviour of the self-diffusion coefficient and of the spin-lattice correlation time have been analysed from QENS and NMR experiments performed on LiCl-GH(2)O and LiCl-4H(2)O. Those results throw some light to primary and secondary relaxation time behaviour in these systems.
  • T Kamiyama, M Goshi, Y Nakamura, K Shibata, K Suzuki
    PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT 126 126 415 - 418 1997年 [査読有り][通常論文]
     
    We have studied the RbNO3-Sr(NO3)(2) and Mg(NO3)(2)-NaNO3 systems in the regime of normal liquid and supercooled liquid from measurements of some dynamical properties. In the periodic table the difference is only in the sizes of the cations, though the ratio of the cationic radii is nearly equal. It has been found that in these glass-forming systems the monovalent cations are main charge carriers, due to the strong correlation between the divalent cations and the nitrate anions. The long range translational motion of the monovalent cation is correlated with the liquid structural motion.
  • PO Maurin, J DupuyPhilon, JF Jal, N Asahi, T Kamiyama, J Kawamura, Y Nakamura
    PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT 126 126 141 - 146 1997年 [査読無し][通常論文]
     
    The temperature behaviour of the self-diffusion coefficient and of the spin-lattice correlation time have been analysed from QENS and NMR experiments performed on LiCl-GH(2)O and LiCl-4H(2)O. Those results throw some light to primary and secondary relaxation time behaviour in these systems.
  • T Kamiyama, M Goshi, Y Nakamura, K Shibata, K Suzuki
    PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT 126 126 415 - 418 1997年 [査読無し][通常論文]
     
    We have studied the RbNO3-Sr(NO3)(2) and Mg(NO3)(2)-NaNO3 systems in the regime of normal liquid and supercooled liquid from measurements of some dynamical properties. In the periodic table the difference is only in the sizes of the cations, though the ratio of the cationic radii is nearly equal. It has been found that in these glass-forming systems the monovalent cations are main charge carriers, due to the strong correlation between the divalent cations and the nitrate anions. The long range translational motion of the monovalent cation is correlated with the liquid structural motion.
  • J Kawamura, T Itagaki, K Arakawa, T Kamiyama, Y Nakamura
    SOLID STATE IONICS 86-8 Part 1 517 - 520 1996年07月 [査読有り][通常論文]
     
    Intermediate range structures of organic-inorganic mixed superionic conductor glasses were investigated by low-angle neutron diffraction and small-angle neutron scattering (SANS) experiments. Significant small angle scatterings were observed in the glasses composed of AgI-CsI-deuterized-tetramethylammonium iodides. The fractal dimension D-f was estimated from the plot of the log I(q) vs. log q; it was 0.39 above q(c) and 2.8 below, where q(c) was a cross-over wavelength of q(c) similar to 0.02-0.05 Angstrom(-1). This result strongly supports the existence of percolation clusters in the organic-inorganic mixed superionic conductor glasses, which has been expected from ionic conductivity measurements.
  • T KAMIYAMA, K SHIBATA, K SUZUKI, Y NAKAMURA
    JOURNAL OF NON-CRYSTALLINE SOLIDS 193 272 - 276 1995年12月 [査読有り][通常論文]
     
    Quasielastic neutron scattering experiments have been performed on the glass-forming nitrate liquid, 0.38Ca(NO3)(2) 0.62KNO(3). The experiments were carried out using the medium resolution LAM-40 inverted geometry time of flight spectrometer installed at the neutron scattering facility KENS, KEK, japan. The measured spectra consist of narrow and broad quasielastic components. The broad component of the spectra corresponds to the fast intra-ionic motions in a nitrate ion. From the momentum dependence of the integrated intensity for this component, it is found that the motion of the nitrate ions in this liquid is mainly the librational one around the C-3 axis of the ion. According to the momentum dependence of the linewidth, this motion is expected to be a jump-diffusional motion. These results suggest that the intra-molecular motion of the nitrate ions in the liquid is strongly restricted by the surrounding cations.
  • Yamamuro Osamu, Muraoka Hiroki, Ohta Tomoko, Matsuo Takasuke, Kume Yoshio, Onoda-yamamuro Noriko, Oikawa Ken-ichi, Kamiyama Takashi
    Journal of the Physical Society of Japan 64 8 2722 - 2725 一般社団法人日本物理学会 1995年08月15日 
    A neutron diffraction experiment on the high-temperaturephase of (ND4)2SeCl6 crystal has been performed with atime-of-flight powder diffractometer. The data were collected at 60 Kin the d-spacing range 0.6–6 Å. The Rietveld refinement revealedthat the crystal has the antifluorite structure $(Fm\bar{3}m,a=9.8420(1){\rm \AA})$ in which four D atoms of the ND+4 ion at(1/4, 1/4, 1/4) are preferentially (but not exclusively) orientedtoward the four unoccupied corners of the (1/2×1/2×1/2)cube surrounding the cation. The Fourier contour map (Fobs) of the(111) section suggested that the D atoms are disordered about thepreferential orientations along the crystallographic 3-fold axes, withsubstantial density of the scattering centers distributed off thesymmetry direction. The result is discussed in the light of previousthermodynamic data on the phase transition at 46 K.
  • T KAMIYAMA, K SHIBATA, K SUZUKI, Y NAKAMURA
    PHYSICA B 213 483 - 485 1995年08月 [査読有り][通常論文]
     
    The molecular motions of nitrate ions in molten RbNO3 and 0.38 Ca(NO3)(2)-0.62 KNO3 have been investigated by quasielastic neutron-scattering experiments. The experiments were carried out using the medium-resolution inverted-geometry time-of-flight spectrometer LAM-40. The measured spectra are constituted of narrow and broad quasielastic components. The broad component is assigned to the fast rotational diffusive motion of a nitrate ion. We compare the momentum and the temperature dependences of the broad component between the glass-forming nitrate melt (0.38 Ca(NO3)(2)-0.62 KNO3) and the simple nitrate melt (RbNO3). In the glass-forming melt this component decreases toward the glass transition temperature, while it remains almost unchanged with decreasing temperature in the simple nitrate melt. This result suggests that the interaction between the nitrate ions and the surrounding cations is stronger in the glass-forming melt than in the simple nitrate melt.
  • J KAWAMURA, K ARAKAWA, T KAMIYAMA, Y NAKAMURA
    SOLID STATE IONICS 79 264 - 272 1995年07月 [査読有り][通常論文]
     
    Quasielastic and inelastic neutron scattering from AgI-CsI-(CH3)(4)NI and AgI-CsI-(CD3)(4)NI superionic glasses were measured as a function of temperature. At the lowest temperatures, vibrational modes from internal motion of (CH3N+ or (CD3N+ were observed above 15 meV. Below 20 meV, a broad peak typical of AgI-containing glasses was observed, which showed significant temperature dependence. This mode is attributable to the vibrational motion of localized Ag+ ions. Above 173 K, quasielastic scatterings were seen below 2 meV; these were fitted by the sum of a single Lorentzian, an elastic peak and background components. The half-width at half-maximum (HWHM) of the Lorentzian component was almost a-independent at higher Q values, and its temperature dependence was lower than the value expected from de conductivity. This quasi-elastic component may be attributed to the local hopping of Ag+ in the AgI cluster of the glass and/or the rotational motion of(CD3N+ ions.
  • T. Kamiyama, K. Shibata, K. Suzuki, Y. Nakamura
    Journal of Non-Crystalline Solids 192-193 272 - 276 1995年 [査読無し][通常論文]
     
    Quasielastic neutron scattering experiments have been performed on the glass-forming nitrate liquid, 0.38Ca(NO3)2 · 0.62KNO3. The experiments were carried out using the medium resolution LAM-40 inverted geometry time of flight spectrometer installed at the neutron scattering facility KENS, KEK, Japan. The measured spectra consist of narrow and broad quasielastic components. The broad component of the spectra corresponds to the fast intra-ionic motions in a nitrate ion. From the momentum dependence of the integrated intensity for this component, it is found that the motion of the nitrate ions in this liquid is mainly the librational one around the C3 axis of the ion. According to the momentum dependence of the linewidth, this motion is expected to be a jump-diffusional motion. These results suggest that the intra-molecular motion of the nitrate ions in the liquid is strongly restricted by the surrounding cations. © 1995, All rights reserved.
  • H ENDO, T TSUZUKI, M YAO, Y KAWAKITA, K SHIBATA, T KAMIYAMA, M MISAWA, K SUZUKI
    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 63 9 3200 - 3203 1994年09月 [査読有り][通常論文]
     
    We have carried out quasielastic neutron scattering measurements on liquid tellurium (1-Te) at 460 degrees C, and inelastic neutron scattering measurements on trigonal tellurium (t-Te) at 400 degrees C, supercooled 1-Te at 400 degrees C and 1-Te at 467 degrees C. The quasielastic scattering peak is comparatively narrow at momentum transfer Q=2.0 Angstrom(-1) where the first peak of the static structure factor is seen. The vibrational density of states (V-DOS) of supercooled 1-Te has a three-band structure similar to that of t-Te, indicating that the chain structure is preserved in the liquid state. The V-DOS of 1-Te changes remarkably with temperature, which strongly demonstrates the modification of chain structure in the liquid state.
  • T KAMIYAMA, K SHIBATA, K SUZUKI
    JOURNAL OF NON-CRYSTALLINE SOLIDS 150 1-3 292 - 296 1992年11月 [査読有り][通常論文]
     
    Quasielastic neutron scattering experiments have been performed on molten RbNO3, The quasielastic spectra are composed of narrow and broad coherent components. The narrow component is assigned to the translational motion due to the diffusion of the center of gravity of each ion. The broad component corresponds to fast intra-ionic motions within the nitrate ion. From the momentum dependence of the broad component, it is concluded that the nitrate ion in molten RbNO3 is mainly subjected to a rotational vibration centered around the C3 axis and that the form of the nitrate motion around C3 axis does not change with increasing temperature.
  • H HAYASHI, T KAMIYAMA, Y NAKAMURA, Y IZUMI
    JOURNAL OF NON-CRYSTALLINE SOLIDS 150 1-3 297 - 301 1992年11月 [査読有り][通常論文]
     
    Quasielastic neutron scattering measurements have been made for concentrated solutions of LiNO3 in (1,3)-diaminopropane in the liquid and glassy states. The results indicate that a harmonic lattice vibration-like motion of the atoms in solid glasses changes around the glass transition temperature to an intermediate one prior to a translational diffusive motion at higher temperatures. This picture is consistent with the previous results obtained from NMR relaxation measurements.
  • H HAYASHI, T KAMIYAMA, Y NAKAMURA, Y IZUMI
    JOURNAL OF NON-CRYSTALLINE SOLIDS 150 1-3 297 - 301 1992年11月 [査読無し][通常論文]
     
    Quasielastic neutron scattering measurements have been made for concentrated solutions of LiNO3 in (1,3)-diaminopropane in the liquid and glassy states. The results indicate that a harmonic lattice vibration-like motion of the atoms in solid glasses changes around the glass transition temperature to an intermediate one prior to a translational diffusive motion at higher temperatures. This picture is consistent with the previous results obtained from NMR relaxation measurements.
  • T KAMIYAMA, K SHIBATA, K SUZUKI
    JOURNAL OF NON-CRYSTALLINE SOLIDS 150 1-3 292 - 296 1992年11月 [査読無し][通常論文]
     
    Quasielastic neutron scattering experiments have been performed on molten RbNO3, The quasielastic spectra are composed of narrow and broad coherent components. The narrow component is assigned to the translational motion due to the diffusion of the center of gravity of each ion. The broad component corresponds to fast intra-ionic motions within the nitrate ion. From the momentum dependence of the broad component, it is concluded that the nitrate ion in molten RbNO3 is mainly subjected to a rotational vibration centered around the C3 axis and that the form of the nitrate motion around C3 axis does not change with increasing temperature.
  • T KANAYA, K KAJI, K INOUE, S IKEDA, K SHIBATA, Y IZUMI, T KAMIYAMA, M FURUSAKA
    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 61 6 1984 - 1991 1992年06月 [査読有り][通常論文]
     
    We have recently developed a high resolution quasielastic neutron scattering spectrometer LAM-80ET by applying mica crystals as analyzers and achieved a resolution of DELTA-epsilon = 1.3-mu-eV using the 002 reflection. Single chain dynamics of polyethylene has been investigated below and above the melting temperature T(m)(= 135-degrees-C) to show the feasibility of the mica 002 reflection as the analyzer. It was found that elastic scattering intensity from polyethylene decreases very steeply around the T(m). Quasielastic broadening in the spectrum at Q=0.082 angstrom-1 is observed only above 210-degrees-C, which is 75-degrees-C higher than the T(m). From the analysis of the spectra by a curve-fitting method, the width of the quasielastic component was evaluated to be 1.8-mu-eV at 250-degrees-C and the activation energy of the width to be 34 kJ/mol.
  • K INOUE, T KANAYA, Y KIYANAGI, S IKEDA, K SHIBATA, H IWASA, T KAMIYAMA, N WATANABE, Y IZUMI
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 309 1-2 294 - 302 1991年11月 [査読有り][通常論文]
     
    Application of mica in the crystal analyzer of time-of-flight spectrometer installed in a pulsed cold-neutron source is a new approach in high-resolution neutron spectroscopy. We constructed a new set of mica-crystal analyzers for the neutron spectrometer at KENS (KEK), that gave a desirable performance of energy resolution accompanying by a surprisingly sharp rise shape of the resolution function. The latter characteristic was especially indicative of the usefulness of a mica-crystal analyzer in the quasi-elastic neutron-scattering studies of localized random motions in condensed matters.
  • K INOUE, T KANAYA, Y KIYANAGI, S IKEDA, K SHIBATA, H IWASA, T KAMIYAMA, N WATANABE, Y IZUMI
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 309 1-2 294 - 302 1991年11月 [査読無し][通常論文]
     
    Application of mica in the crystal analyzer of time-of-flight spectrometer installed in a pulsed cold-neutron source is a new approach in high-resolution neutron spectroscopy. We constructed a new set of mica-crystal analyzers for the neutron spectrometer at KENS (KEK), that gave a desirable performance of energy resolution accompanying by a surprisingly sharp rise shape of the resolution function. The latter characteristic was especially indicative of the usefulness of a mica-crystal analyzer in the quasi-elastic neutron-scattering studies of localized random motions in condensed matters.
  • S IKEDA, N WATANABE, K INOUE, Y KIYANAGI, A INABA, S TAKEDA, T KANAYA, K SHIBATA, T KAMIYAMA, Y IZUMI, Y OZAKI, CJ CARLILE
    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 60 10 3340 - 3350 1991年10月 [査読有り][通常論文]
     
    A high energy-resolution neutron spectrometer with large mica mirrors, LAM-80ET, has been constructed at National Laboratory for High Energy Physics in Japan (KEK). The highest resolution achieved with this spectrometer is 1.2-mu-eV. In order to examine the capability of the spectrometer, the rotational tunnelling of the methyl group in 4-methyl pyridine N-oxide (N-oxy gamma-picoline) has been measured. Using the (004) reflection of the mica mirrors, we have clearly observed four peaks at epsilon = 60, 115, 190 and 274-mu-eV. Measurements of the Q-dependence of these tunnelling peaks show that the tunnelling potential may be three-fold. It is also shown that the line width of tunnelling modes and the spin conversion at T > 5 K are derived by the libron-phonon process with E(L) = 30-40 K.
  • K SHIBATA, T KAMIYAMA, K SUZUKI, K INOUE
    JOURNAL OF NON-CRYSTALLINE SOLIDS 117 Part 1 120 - 123 1990年02月 [査読有り][通常論文]
  • K SHIBATA, T KAMIYAMA, K SUZUKI, K INOUE
    JOURNAL OF NON-CRYSTALLINE SOLIDS 117 118 120 - 123 1990年02月 [査読無し][通常論文]

書籍

  • DOS/Vパソコンによる科学計測入門(共著)
    NFS出版 1994年
  • Introduction to the Scientific Measurements Using DOS/V Personal Computers
    1994年

講演・口頭発表等

作品等

  • eV中性子による中性子散乱の研究
    2001年
  • A study of Neutron Scattering by eV Neutron
    2001年
  • 液体金属の中性子散乱
    1999年
  • Neutron Scattering of Liquid Metals
    1999年

その他活動・業績

  • 平野主馬, 佐藤博隆, 伊藤大介, 齊藤泰司, 加美山隆 日本原子力学会北海道支部研究発表会講演要旨集 37th (CD-ROM) 2020年
  • 加美山隆, 長谷美宏幸, 佐藤博隆, 中島健 日本原子力学会春の年会予稿集(CD-ROM) 2018 2018年
  • 佐野忠史, 阿部尚也, 伊藤大介, 高橋佳之, 堀順一, LEE Jeahong, 中島健, 加美山隆, 持木幸一, 小池公, 鬼柳善明, 佐藤節夫 日本原子力学会春の年会予稿集(CD-ROM) 2018 2018年
  • 中島健, 加美山隆, 持木幸一, 小池公, 鬼柳善明, 佐藤節夫 日本原子力学会春の年会予稿集(CD-ROM) 2018 2018年
  • T. Kamiyama, S. Satoh, H. Sato, H. Hasemi, K. Kino, K. Nakajima 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016 2017- 2017年10月16日 [査読無し][通常論文]
     
    A combination of a neutron image intensifier and a photomultiplier tube array was developed as a neutron imaging device for time-of-flight measurement. The device had an advantage in the neutron counting measurement because of the proportionality to the neutron intensity. A problem was in poor spatial resolution by the photomultiplier tube array, so the super-resolution ability based on the center-of-mass calculation was attached to the newly developed data taking system. We confirmed its ability of time-of-flight measurement through the trial experiment. The super-resolution system also operated without failure.
  • H. Hasemi, T. Kamiyama, H. Sato, K. Kino, K. Nakajima 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016 2017- 2017年10月16日 [査読無し][通常論文]
     
    Using pulsed neutron imaging, the distributions of absolute values of nuclide densities and temperatures of the sample can be estimated. However, the images obtained by the pulsed neutron imaging have a low spatial resolution because of the performance limitations of the detector. On the other hand, X-ray radiograms have higher spatial resolution compared with the neutron images. To obtain higher-resolution neutron images, we developed the resolution enhancement method for neutron images by cooperating with the X-ray radiography. The resolution enhancement method consists of the image alignment and the mapping methods. As a first step, we tried mapping neutron transmission image into the X-ray image.
  • 長谷美宏幸, 加美山隆, 佐藤博隆, 中島健 日本原子力学会秋の大会予稿集(CD-ROM) 2017 2017年
  • KINO Koichi, FURUSAKA Michihiro, HIRAGA Fujio, KAMIYAMA Takashi, KIYANAGI Yoshiaki, KIYANAGI Yoshiaki, KIMURA Atsushi, HARADA Hideo, NAKAMURA Shyoji, TOH Yosuke, IGASHIRA Masayuki, KATABUCHI Tatsuya, MIZUMOTO Motoharu, HORI Jun‐ichi 日本原子力研究開発機構JAEA-Conf(Web) (2015-003) 3 (WEB ONLY) 2016年03月 [査読無し][通常論文]
  • 加美山隆, 長谷美宏幸, 佐藤博隆, 中島健 日本原子力学会秋の大会予稿集(CD-ROM) 2016 2016年
  • 佐野忠史, 伊藤大介, 堀順一, 高橋佳之, 長谷美宏幸, 加美山隆, 中島健 日本原子力学会秋の大会予稿集(CD-ROM) 2016 2016年
  • T. Kamiyama, K. Y. Hara, H. Taira, H. Sato Nuovo Cimento della Societa Italiana di Fisica C 38 (6) 2015年11月01日 [査読有り][通常論文]
     
    The convertible source system for the neutron and the X-ray imagings was installed in the 45MeV electron linear accelerator facility at Hokkaido University. The source system is very useful for a complementary imaging. The imaging measurements for a sample were performed with both beams by using a vacuum tube type image intensifier. The enhanced contrast was obtained from the dataset of the radiograms measured with the neutron and X-ray beams.
  • 木野幸一, 加美山隆, 平賀富士夫, 鬼柳善明, 原田秀郎, 木村敦, 中村詔司, 井頭政之, 堀順一 日本原子力学会春の年会予稿集(CD-ROM) 2015 ROMBUNNO.N03 2015年03月05日 [査読無し][通常論文]
  • H. Hasemi, M. Harada, T. Kai, T. Shinohara, M. Ooi, H. Sato, K. Kino, M. Segawa, T. Kamiyama, Y. Kiyanagi NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 773 137 -149 2015年02月 [査読無し][通常論文]
     
    It should be possible to non-destructively estimate nuclide density by analyzing the transmission clips due to the resonance absorption in neutron transmission spectra In this study performed at the NOBORU instrument in J-PARC/MLF, we evaluated the quality of the neutron resonance transmission measurements and their potential use in the estimation of nuclide density. First, we calculated the emission time distributions of epithermal neutrons by simulation and then fitted the pulse shapes using several kinds of functions to make a response function suitable for the NOBORU instrument. We found that the Cole-Windsor function well reproduced the pulse shape at arbitrary energy. Then, we applied this function to the resonance analysis code REFIT, and found that it was possible to reproduce the resonance shapes. Finally, we performed the transmission measurements at NOBORU and analyzed the resonance dips for Ta, Ag and Cu by the revised REFIT code. (C) 2014 Elsevier B.V. All rights reserved.
  • 中島健, 加美山隆, 持木幸一, 鬼柳善明, 小池公, 佐藤節夫 日本原子力学会秋の大会予稿集(CD-ROM) 2015 2015年
  • 篠原武尚, 甲斐哲也, 及川健一, 中谷健, 瀬川麻里子, 原田正英, 廣井孝介, SU. Y, 相澤一也, 林田洋寿, PARKER J. D, 松本吉弘, ZHANG S, 佐藤博隆, 加美山隆, 横田秀夫, 世良俊博, 持木幸一, 鬼柳善明 日本中性子科学会年会講演概要集 15th 50 2015年 [査読無し][通常論文]
  • N. Wada, T. Shinohara, H. Sato, H. Hasemi, T. Kamiyama, Y. Kiyanagi Physics Procedia 69 427 -435 2015年 [査読無し][通常論文]
     
    Magnetic field imaging using polarized pulsed neutrons is attractive technique because it has the capability to visualize spatial distribution of the magnetic field. Analyzing neutron polarization change due to neutron spin rotation result under a magnetic field at each position makes it possible to obtain a spatial distribution of magnetic field. As previous work, One-dimensional polarization analysis setup using pulsed neutrons was established at J-PARC MLF and HUNS. In this paper, we have established three-dimensional polarization analysis setup to deducea magnetic field strength and the directionprecisely and, quantitatively evaluated averaged magnetic field strength and the directioninside a coil by comparing ones calculated by magnetic calculation using FEM and one measured by a hall probe.
  • K. Mochiki, K. Ishizuka, K. Morikawa, T. Kamiyama, Y. Kiyanagi Physics Procedia 69 143 -151 2015年 [査読無し][通常論文]
     
    Pulsed neutron transmission spectroscopic radiography is an attractive new technique in energy-resolved neutron radiography.The imaging technique is based on the spectralanalysis of neutrons throughthe time-of-flight (TOF) method.The neutron transmission spectrum that can be obtained usinga time-resolved neutron imaging system includes the Bragg-scattering edges with crystallographic information and thetransmission dips duetotheresonanceabsorptionofthenuclei.To obtain the neutron transmission spectrum with high-power neutron sources, we developed anew high-performance imaging system consisting of a neutroncolor image intensifier, photon image intensifier, high-resolution CMOS camera, and high-frame-rate camera. The system was used for experiments at the electron linac pulsed neutron source in Hokkaido University, and the targeted function was proved to be successful.
  • S. Nakamura, A. Kimura, M. Ohta, T. Fujii, S. Fukutani, K. Furutaka, S. Goko, H. Harada, K. Hirose, J. Hori, M. Igashira, T. Kamiyama, T. Katabuchi, T. Kin, K. Kino, F. Kitatani, Y. Kiyanagi, M. Koizumi, M. Mizumoto, M. Oshima, K. Takamiya, Y. Toh, H. Yamana Nuclear Back-End and Transmutation Technology for Waste Disposal: Beyond the Fukushima Accident 39 -46 2015年01月01日 [査読無し][通常論文]
     
    To evaluate the feasibility of development of nuclear transmutation technology and an advanced nuclear system, precise nuclear data of neutron capture cross sections for long-lived fission products (LLFPs) and minor actinides (MAs) are indispensable. In this chapter, we present our research activities for the measurements of neutron capture cross sections for LLFPs and MAs.
  • E. Barzagli, F. Grazzi, F. Salvemini, A. Scherillo, H. Sato, T. Shinohara, T. Kamiyama, Y. Kiyanagi, A. Tremsin, Marco Zoppi EUROPEAN PHYSICAL JOURNAL PLUS 129 (7) 2014年07月 [査読無し][通常論文]
     
    The phase composition and the microstructure of four ferrous Japanese arrows of the Edo period (17th-19th century) has been determined through two complementary neutron techniques: Position-sensitive wavelength-resolved neutron transmission analysis (PS-WRNTA) and time-of-flight neutron diffraction (ToF-ND). Standard ToF-ND technique has been applied by using the INES diffractometer at the ISIS pulsed neutron source in the UK, while the innovative PS-WRNTA one has been performed at the J-PARC neutron source on the BL-10 NOBORU beam line using the high spatial high time resolution neutron imaging detector. With ToF-ND we were able to reach information about the quantitative distribution of the metal and non-metal phases, the texture level, the strain level and the domain size of each of the samples, which are important parameters to gain knowledge about the technological level of the Japanese weapon. Starting from this base of data, the more complex PS-WRNTA has been applied to the same samples. This experimental technique exploits the presence of the so-called Bragg edges, in the time-of-flight spectrum of neutrons transmitted through crystalline materials, to map the microstructural properties of samples. The two techniques are non-invasive and can be easily applied to archaeometry for an accurate microstructure mapping of metal and ceramic artifacts.
  • Y. Kiyanagi, T. Kamiyama, K. Kino, H. Sato, S. Sato, S. Uno JOURNAL OF INSTRUMENTATION 9 2014年07月 [査読無し][通常論文]
     
    2-dimensional position sensitive detectors are used for pulsed neutron imaging and at each pixel of the detector a time of flight spectrum is recorded. Therefore, a transmission spectrum through the object has wavelength dependent structure reflecting the neutron total cross section. For such measurements, the detectors are required to have ability to store neutron events as a function of the flight time as well as to have good spatial resolution. Furthermore, high counting rate is also required at the high intensity neutron sources like J-PARC neutron source in Japan. We have developed several types of detectors with different characteristics; two counting type detectors for high counting rate with coarse spatial resolution and one camera type detector for high spatial resolution. One of counting type detectors is a pixel type. The highest counting rate is about 28 MHz. Better spatial resolution is obtained by a GEM detector. Effective area is 10 x 10 cm(2), pixel size is 0.8 mm. The maximum counting rate is 3.65 MHz. To get higher spatial resolution we are now developing the camera type detector system using a neutron image intensifier, which have image integration function as a function of time of flight. We have succeeded to obtain time dependent images in this camera system. By using these detectors we performed transmission measurements for obtaining the crystallographic information and elemental distribution images.
  • Y. Kiyanagi, T. Kamiyama, K. Kino, H. Sato, S. Sato, S. Uno JOURNAL OF INSTRUMENTATION 9 2014年07月 [査読無し][通常論文]
     
    2-dimensional position sensitive detectors are used for pulsed neutron imaging and at each pixel of the detector a time of flight spectrum is recorded. Therefore, a transmission spectrum through the object has wavelength dependent structure reflecting the neutron total cross section. For such measurements, the detectors are required to have ability to store neutron events as a function of the flight time as well as to have good spatial resolution. Furthermore, high counting rate is also required at the high intensity neutron sources like J-PARC neutron source in Japan. We have developed several types of detectors with different characteristics; two counting type detectors for high counting rate with coarse spatial resolution and one camera type detector for high spatial resolution. One of counting type detectors is a pixel type. The highest counting rate is about 28 MHz. Better spatial resolution is obtained by a GEM detector. Effective area is 10 x 10 cm(2), pixel size is 0.8 mm. The maximum counting rate is 3.65 MHz. To get higher spatial resolution we are now developing the camera type detector system using a neutron image intensifier, which have image integration function as a function of time of flight. We have succeeded to obtain time dependent images in this camera system. By using these detectors we performed transmission measurements for obtaining the crystallographic information and elemental distribution images.
  • 甲斐哲也, 篠原武尚, 及川健一, 瀬川麻里子, 飯倉寛, 原田正英, 中谷健, 大井元貴, 佐藤博隆, 加美山隆, 横田秀夫, 俵丈展, 世良俊博, 鬼柳善明 アイソトープ・放射線研究発表会要旨集 51st 109 2014年06月20日 [査読無し][通常論文]
  • A. S. Tremsin, T. Shinohara, T. Kai, M. Ooi, T. Kamiyama, Y. Kiyanagi, Y. Shiota, J. B. McPhate, J. V. Vallerga, O. H. W. Siegmund, W. B. Feller NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 746 47 -58 2014年05月 [査読無し][通常論文]
     
    The sharp variation of neutron attenuation at certain energies specific to particular nuclides (the lower range being from similar to 1 eV up to similar to 1 key), can be exploited for the remote mapping of element and/or isotope distributions, as well as temperature probing, within relatively thick samples. Intense pulsed neutron beam-lines at spallation sources combined with a high spatial, high-timing resolution neutron counting detector, provide a unique opportunity to measure neutron transmission spectra through the time-of-flight technique. We present the results of experiments where spatially resolved neutron resonances were measured, at energies up to 50 keV. These experiments were performed with the intense flux low background NOBORU neutron beamline at the J-PARC neutron source and the high timing resolution (similar to 20 ns at epithermal neutron energies) and spatial resolution (similar to 55 mu m) neutron counting detector using microchannel plates coupled to a Timepix electronic readout. Simultaneous element-specific imaging was carried out for several materials, at a spatial resolution of similar to 150 mu m. The high timing resolution of our detector combined with the low background beamline, also enabled characterization of the neutron pulse itself - specifically its pulse width, which varies with neutron energy. The results of our measurements are in good agreement with the predicted results for the double pulse structure of the J-PARC facility, which provides two 100 ns-wide proton pulses separated by 600 ns, broadened by the neutron energy moderation process. Thermal neutron radiography can be conducted simultaneously with resonance transmission spectroscopy, and can reveal the internal structure of the samples. The transmission spectra measured in our experiments demonstrate the feasibility of mapping elemental distributions using this non-destructive technique, for those elements (and in certain cases, specific isotopes), which have resonance energies below a few keV, and with lower resolution for elements with relatively high resonance energies in the 1-30 keV range. (c) 2014 Elsevier B.V. All rights reserved.
  • 新井拓朗, 水本元治, 寺田和司, 片渕竜也, 井頭政之, 廣瀬健太郎, 木村敦, 中村詔司, 藤暢輔, 原かおる, 北谷文人, 古高和禎, 小泉光生, 大島真澄, 原田秀郎, 堀順一, 木野幸一, 加美山隆, 鬼柳善明 日本原子力学会春の年会予稿集(CD-ROM) 2014 ROMBUNNO.J08 2014年03月10日 [査読無し][通常論文]
  • K. Kino, M. Furusaka, F. Hiraga, T. Kamiyama, Y. Kiyanagi, K. Furutaka, S. Goko, K. Y. Hara, H. Harada, M. Harada, K. Hirose, T. Kai, A. Kimura, T. Kin, F. Kitatani, M. Koizumi, F. Maekawa, S. Meigo, S. Nakamura, M. Ooi, M. Ohta, M. Oshima, Y. Toh, M. Igashira, T. Katabuchi, M. Mizumoto, J. Hori NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 736 66 -74 2014年02月 [査読無し][通常論文]
     
    We studied the energy resolution of the pulsed neutron beam of the Accurate Neutron-Nucleus Reaction Measurement Instrument (ANNRI) at the Japan Proton Accelerator Research Complex/Materials and Life Science Experimental Facility (J-PARC/MLF). A simulation in the energy region from 0.7 meV to 1 MeV was performed and measurements were made at thermal (0.76-62 meV) and epithermal energies (4.8-410 eV). The neutron energy resolution of ANNRI determined by the time technique depends on the Lime structure of the neutron pulse. We obtained the neutron energy resolution as a function of the neutron energy by the simulation in the two operation modes of the neutron source: double- and single bunch modes in double bunch mode, the resolution deteriorates above about 10 eV because the time structure of the neutron pulse splits into two peaks. The time structures at 13 energy points from measurements in the thermal energy region agree with those of the simulation. In the epithermal energy region, the time structures at 17 energy points were obtained from measurements and agree with those of the simulation. The FWHM values of the time structures by the simulation and measurements were found to be almost consistent. In the single-bunch mode, the energy resolution is better than about 1% between 1 meV and 10 keV at a neutron source operation of 17.5 kW. These results confirm the energy resolution of the pulsed neutron beam produced by the ANNRI beamline. (C) 2013 Elsevier B.V. All rights reserved.
  • GONG Wu, AIZAWA Kazuya, HARJO Stefanus, IWAHASHI Takaaki, ABE Jun, KAMIYAMA Takashi 日本金属学会講演概要(CD-ROM) 154th 2014年
  • 岩下秀徳, 新井薫, 小谷川喬, 佐藤博隆, 木野幸一, 加美山隆, 平賀富士夫, 鬼柳善明, 古坂道弘 日本中性子科学会年会講演概要集 14th 31 2014年 [査読無し][通常論文]
  • H. Ishikawa, T. Kamiyama, K. Nittoh, M. Yahagi, Y. Kiyanagi Physics Procedia 60 (C) 356 -362 2014年 [査読無し][通常論文]
     
    A vacuum-tube type neutron image intensifier (NII), composed of Gd or 10B neutron convertor, is considered to have better spatial resolution and better detection efficiency compared with a traditional neutron scintilator. However, quantitative evaluation of difference in sensitivity among these imagers and difference in characteristics of the images between two NIIs has not been done since it needs measurements under the same irradiation condition. In this study we carried out radiography experiments at Hokkaido University Neutron Source (HUNS). Firstly, neutron radiography images were obtained by Gd-type NII, 10B-type NII, and the traditional neutron scintillator NE426 (ZnS:Ag/6LiF). Next, we evaluated the brightness values from these images. We also evaluated the contrast and the image quality from two NIIs. The brightness of Gd-type NII is 8.8 times and the 10B-type is 12.9 times higher than the NE426. There is contrast little difference between the two types of NII. The image quality of Gd-type is better than 10B-type when exposure time is short.
  • Hirotaka Sato, Yoshinori Shiota, Takashi Kamiyama, Masato Ohnuma, Michihiro Furusaka, Yoshiaki Kiyanagi Physics Procedia 60 (C) 254 -263 2014年 [査読無し][通常論文]
     
    Performances of the Bragg-edge transmission imaging at a compact accelerator-driven pulsed neutron source (pulsed CANS) are presented and evaluated. This technique is expected to be a new material analysis tool that can quantitatively visualize crystalline microstructural information inside a bulk material over large area with reasonable spatial resolution non-destructively. Therefore, it is expected that such new useful instrument should be installed at not only world-leading pulsed spallation neutron sources but also popular-priced CANS. For this reason, we evaluated and discussed the performances of the Bragg-edge transmission imaging at CANS for potential users. A coupled moderator is usually used to gain higher neutron flux at CANS. In such situation, quantitative imaging of crystal lattice strain and crystalline phase is not easy due to the low wavelength resolution. However, according to Monte-Carlo simulation calculation studies, it was found that an experimental setup using a decoupled moderator connected to a supermirror guide tube can solve this problem. On the other hand, in the situation using the coupled moderator, quantitative imaging of crystallographic texture and crystallite size can be carried out, but the Rietveldtype data analysis software, RITS, is necessary to evaluate reasonably low statistics data measured at CANS. Furthermore, it was found that reasonable results can be obtained by the Bragg-edge transmission imaging with the RITS code at CANS, which are consistent with results of a high-performance neutron diffraction experiment with the Rietveld analysis at a world-leading pulsed spallation neutron source. This means the Bragg-edge transmission imaging is expected to be one of the most efficient crystallographic/metallographic analysis tools for CANS.
  • T. Negishi, T. Shinohara, H. Sato, H. Hasemi, T. Kamiyama, Y. Kiyanagi Physics Procedia 60 (C) 91 -96 2014年 [査読無し][通常論文]
     
    Imaging using polarized neutrons is one of the most attractive techniques in the neutron imaging field, because of its capability to visualize magnetic field inside materials or spaces by analyzing neutron polarization. An advanced method, which can quantify the magnetic field by combining the time-of-flight method with a polarization analysis of pulsed neutrons, has been developed at J-PARC. To introduce this method to the compact accelerator-driven neutron source, we have started the magnetic imaging experiments at Hokkaido University Neutron Source (HUNS). Using an experimental system consisting of a pair of magnetic super-mirrors as a polarizer and an analyzer, a spin flipper, and a two-dimensional neutron detector, we obtained the polarization of 90% at the wavelength over 6 Å. The first demonstration experiments were performed for coil samples. As a result, an oscillatory behaviour of polarization depending on the wavelength due to the neutron spin's Larmor precession was clearly observed.
  • Michihiro Furusaka, Hirotaka Sato, Takashi Kamiyama, Masato Ohnuma, Yoshiaki Kiyanagi Physics Procedia 60 (C) 167 -174 2014年 [査読無し][通常論文]
     
    Hokkaido University neutron source, HUNS was completed in 1973, and has been used actively for developments of moderators, neutron instruments, neutron devices and new methods for 40 years although its power is not so high. Recently, a pulsed neutron imaging method has been developed and a new type of small angle neutron scattering method has been also developed. The pulsed neutron imaging is a unique method that can give the physical quantities such as crystallographic quantities of materials over wide area of the real space. So far, the small angle neutron scattering (SANS) is considered to be impossible at a neutron source with a power of HUNS. However, mini focusing SANS (mfSANS) was developed and proved to be useful. Here, we present the present activities on the pulsed neutron imaging and mfSANS at HUNS.
  • S. Nagashima, Y. Shiota, H. Sato, T. Kamiyama, M. Ohnuma, Y. Kiyanagi Physics Procedia 60 (C) 327 -331 2014年 [査読無し][通常論文]
     
    Japanese swords are peculiar ones forged by a unique method developed in Japan. The forging methods are different each other, depending on age and area. Therefore, the crystalline structure of a Japanese sword depends on the age and the area. In this study, we obtained crystallographic information of Japanese swords and investigated the difference in texture and crystallite size from Japanese swords by using the pulsed neutron transmission spectroscopy. The neutron transmission experiment was carried out at HUNS (Hokkaido University Neutron Source). The samples were two types of Japanese swords. We analyzed the position-dependent neutron transmission spectra and obtained quantitative microstructural information in two-dimensional real space. We found that there were differences of the microstructure between edge and back of each Japanese sword and the microstructure was different between two Japanese swords.
  • H. Hasemi, M. Harada, T. Kai, H. Sato, M. Ooi, M. Segawa, T. Shinohara, K. Kino, T. Kamiyama, Y. Kiyanagi Physics Procedia 60 (C) 244 -253 2014年 [査読無し][通常論文]
     
    We can non-destructively obtain an image of nuclide/isotope distribution or temperature in a substance by analyzing the dips due to the resonance absorption in a neutron transmission spectrum. The observed transmission spectra are expressed by convolution of intrinsic resonance cross section and neutron pulse shape, namely the emission time distribution of neutrons emitted from a moderator. Therefore, the pulse shape should be reproduced at arbitrary energy by a synthetic function for performing the quantitative resonance analysis. We have found that the Cole-Windsor function reproduced well the pulse shape of the instrument at J-PARC (Japan Proton Accelerator Research Complex) neutron source and succeeded in evaluating nuclide density of some samples quantitatively by analyzing transmission resonance spectra. On the other hand, the function expressing the pulse shape of a thermal neutron source at Hokkaido University has not been found. Therefore, we have calculated the pulse shape of epithermal neutrons by Monte-Carlo simulation and fitted the pulse shape using several kinds of function. We found that the Cole-Windsor function also was the best function for reproducing the pulse shape of the source. Moreover, we implemented it to the resonance analysis code and calculated the resonance transmission spectra of some nuclide to evaluate the capability for resonance analysis at Hokkaido University source.
  • 相澤 一也, ステファヌス ハルヨ, ゴン ウー, 阿部 淳, 岩橋 孝明, 神山 崇 計算力学講演会講演論文集 2013 (26) "1417 -1"-"1417-2" 2013年11月02日 
    濃度変調と積層変調が同期した新奇な構造(シンクロ型LPSO構造)を持つLPSO単相合金及びAI合金を凌駕する機械的性質を有するMg相とLPSO相からなるMg基シンクロ型LPSO合金に関して,その場パルス中性子回折により応力応答の評価を行った. 18R LPSO単相合金の引張応力に対する格子ひずみの応答は,a軸とc軸との間に異方性が見られた.また2相合金では,LPSO相が強化を担っており,低18R LPSO 体積分率押出合金では,降伏応力まで,測定した範囲で,Mg相と18R LPSO 相応力に対する各格子面の格子ひずみの応答に異方性は,見られなかった.
  • MATSUHASHI Taihei, IGASHIRA Masayuki, KATABUCHI Tatsuya, MIZUMOTO Motoharu, TERADA Kazushi, HIROSE Kentaro, KIMURA Atsushi, FURUTAKA Kazuyoshi, HARA Kaoru, HARADA Hideo, KOIZUMI Mitsuo, KITATANI Fumito, NAKAMURA Shoji, OSHIMA Masumi, TOH Yosuke, KAMIYAMA Takashi, KINO Koichi, KIYANAGI Yoshiaki, HORI Jun‐ichi 日本原子力研究開発機構JAEA-Conf(Web) (2013-002) 25 (WEB ONLY) 2013年10月 [査読無し][通常論文]
  • 松橋泰平, 水本元治, 片渕竜也, 寺田和司, 井頭政之, 廣瀬健太郎, 木村敦, 中村詔司, 藤暢輔, 原かおる, 北谷文人, 古高和禎, 小泉光生, 大島真澄, 原田秀郎, 堀順一, 木野幸一, 加美山隆, 鬼柳善明 日本原子力学会春の年会予稿集(CD-ROM) 2013 ROMBUNNO.I09 2013年03月11日 [査読無し][通常論文]
  • 片渕竜也, 水本元治, 寺田和司, 松橋泰平, 井頭政之, 廣瀬健太郎, 木村敦, 中村詔司, 藤暢輔, 原かおる, 北谷文人, 古高和禎, 小泉光生, 大島真澄, 原田秀郎, 堀順一, 木野幸一, 加美山隆, 鬼柳善明 日本原子力学会春の年会予稿集(CD-ROM) 2013 ROMBUNNO.I08 2013年03月11日 [査読無し][通常論文]
  • GONG Wu, AIZAWA Kazuya, HARJO Stefanus, ABE Jun, IWAHASHI Takaaki, KAMIYAMA Takashi 日本金属学会講演概要(CD-ROM) 152nd 2013年
  • Activities on the Neutron and Photon Experiments at Hokkaido University
    A. Makinaga, H. Akimune, G.N. Kim, T. Kamiyama, S. Goko, Y. Kiyanagi, K. Kino, M. Aikawa, K. Kato “AASPP Workshop, the 3rd Asian Nuclear Reaction Database Development Workshop” Proc. LENP/P-2012/08. 2013年 [査読無し][通常論文]
  • Photo neutron experiment by using activation method at Hokkaido University
    A. Makinaga, H. Akimune, H. Otsu, T. Kamiyama, K. Kino, Y. Kiyanagi, M. Aikawa, K. Kato The 4th Asia Nuclear Reaction Database Development Workshop, INDC(KAS)-0001 2013年 [査読無し][通常論文]
  • M. Ooi, M. Teshigawara, T. Kai, M. Harada, F. Maekawa, M. Futakawa, E. Hashimoto, M. Segawa, M. Kureta, A. Tremsin, T. Kamiyama, Y. Kiyanagi Physics Procedia 43 337 -342 2013年 [査読無し][通常論文]
     
    The Japan Spallation Neutron Source (JSNS) at the Japan Proton Accelerator Research Complex (J-PARC) was developed as a 1-MW spallation neutron source. A Ag-In-Cd alloy was used as the decoupler material in two decoupled moderators. Although the Ag-In-Cd decoupler brings about superior neutronic performance, it has the disadvantage of high residual radioactivity. A Au-In-Cd alloy has been proposed as a solution to this problem. Recently, we successfully produced a ternary Au-In-Cd alloy. The alloy composition was 74.9 at% Au, 0.5 at% In, and 24.6 at% Cd. The distribution of the elements in the alloy was first determined by energy-dispersive X-ray (EDX) analysis. However, it was difficult to measure the In distribution by EDX because the amount of In is very small, and its spectrum is similar to that of Cd. Therefore, pulsed neutron imaging using both a time gated camera system and a multi-channel plate detector was performed to measure the elements in the Au-In-Cd alloy. The analysis was performed at the BL10 in the JSNS on samples of the Au-In-Cd alloy, an In foil, and two Au foils. With this technique, the distribution of Au, In, and Cd in the Au-In-Cd specimen was distinctly determined. © 2013 The Authors.
  • Y. Kiyanagi, T. Shinohara, T. Kai, T. Kamiyama, H. Sato, K. Kino, K. Aizawa, M. Arai, M. Harada, K. Sakai, K. Oikawa, M. Ooi, F. Maekawa, H. Iikura, T. Sakai, M. Matsubayashi, M. Segawa, M. Kureta Physics Procedia 43 92 -99 2013年 [査読無し][通常論文]
     
    Pulsed neutron imaging methods provide information on crystallographic structure, magnetic field, elemental composition, hydrogen bound state and other material features. Such methods have been expected to be a powerful complement to the traditional imaging method. Data analysis codes, detectors and new applications are being developed in Japan, and a new imaging beam line is being constructed at J-PARC. Here, recent progress in Japanese research on pulsed neutron imaging is presented, and a design for construction of the new imaging beam line is reported. © 2013 The Authors.
  • H. Sato, T. Shinohara, R. Kiyanagi, K. Aizawa, M. Ooi, M. Harada, K. Oikawa, F. Maekawa, K. Iwase, T. Kamiyama, Y. Kiyanagi Physics Procedia 43 186 -195 2013年 [査読無し][通常論文]
     
    The RITS code was developed for quantitative evaluation and visualization of crystalline structural information (e.g. crystallographic texture, preferred crystal orientation, crystallite block size and crystal lattice strain, etc.) of a material, analyzing position-dependent Bragg edge transmission spectra measured in an imaging experiment with pulsed neutrons. Originally, this code was neither able to deal with all the crystal structures that were classified into 230 types of space groups, nor applicable to materials composed of multi elements and multi crystalline phases. Therefore, we improved the RITS code for expansion of its capability, and then performed some demonstrations of simulation calculations and profile fitting analyses of experimental data. In this article, we present the new algorithm and the new functions of the improved RITS code, and the results of the simulation calculations and the experimental data analyses. © 2013 The Authors.
  • 中村詔司, 木村敦, 北谷文人, 金政浩, 小泉光生, 藤暢輔, 原かおる, 廣瀬健太郎, 古高和禎, 原田秀郎, 大島真澄, 片渕竜也, 水本元治, 井頭政之, 木野幸一, 平賀富士夫, 加美山隆, 鬼柳善明, 堀順一, 八島浩 日本原子力学会秋の大会予稿集(CD-ROM) 2012 ROMBUNNO.I02 2012年09月03日 [査読無し][通常論文]
  • 廣瀬健太郎, 大島真澄, 北谷文人, 木村敦, 小泉光生, 藤暢輔, 中村詔司, 原かおる, 原田秀郎, 古高和禎, 井頭政之, 片渕竜也, 寺田和司, 松橋泰平, 水本元治, 加美山隆, 木野幸一, 鬼柳善明, 堀順一 日本原子力学会秋の大会予稿集(CD-ROM) 2012 ROMBUNNO.I04 -46 2012年09月03日 [査読無し][通常論文]
     
    J-PARCに設置した中性子核反応測定装置(ANNRI)のNaI(Tl)検出器を用いて、Sn-119の中性子捕獲断面積をTOF法により測定した。
  • 片渕竜也, 水本元治, 寺田和司, 松橋泰平, 井頭政之, 廣瀬健太郎, 木村敦, 中村詔司, 藤暢輔, 原かおる, 北谷文人, 古高和禎, 小泉光生, 大島真澄, 原田秀郎, 堀順一, 木野幸一, 加美山隆, 鬼柳善明 日本原子力学会秋の大会予稿集(CD-ROM) 2012 ROMBUNNO.I05 2012年09月03日 [査読無し][通常論文]
  • 木野幸一, 加美山隆, 鬼柳善明, 平賀富士夫, 古坂道弘, 太田雅之, 大島真澄, 北谷文人, 木村敦, 金政浩, 小泉光生, 後神進史, 藤暢輔, 中村詔司, 原かおる, 原田秀郎, 廣瀬健太郎, 古高和禎, 井頭政之, 片渕竜也, 水本元治, 堀順一, 高宮幸一, 福谷哲, 藤井俊行 日本原子力学会春の年会予稿集(CD-ROM) 2012 ROMBUNNO.C33 2012年03月02日 [査読無し][通常論文]
  • Y. Kiyanagi, H. Sato, T. Kamiyama, T. Shinohara 5TH EUROPEAN CONFERENCE ON NEUTRON SCATTERING 340 2012年 [査読無し][通常論文]
     
    Neutron imaging using pulsed neutron sources coupled with a 2-dimensional position sensitive detector applicable to the time-of-flight method can give information on the crystal texture of coherently scattering materials, dynamical information of incoherently scattering materials such as hydrogen, and magnetic field information. Bragg edges appeared at cold neutron region reflect the preferred orientation, crystallite size, and lattice spacing. To deduce such information from the neutron transmission data depending on the position we have developed a data analysis code, and applied this code to data of a welded iron sample. Furthermore, as examples of more realistic materials we have investigated quenched iron rods. The quenched region was clearly demonstrated by the lattice space distribution. Furthermore, difference in the bound state of water or hydrogen in wet and dry cement pastes have been observed by analyzing the gradient of the neutron transmission cross section at the cold neutron region. The magnetic field has been also measured by using the polarized neutrons, and the strength of the field was estimated easily by analyzing the wave length dependent data.
  • M. Yamashita, K. Mochiki, T. Kamiyama, Y. Kiyanagi IEEE Nuclear Science Symposium Conference Record 370 -372 2012年 [査読無し][通常論文]
     
    As a new technique the pulsed neutron transmission spectroscopic radiography is attractive in the research fields of energy-resolved neutron radiography. The imaging technique is based on the energy-analysis of neutrons by time-of-flight (TOF) method. The neutron transmission spectrum includes the Bragg scattering edges with the crystallographic structure and texture information. We developed a high performance high-frame-rate camera for this neutron imaging at an electron linac pulsed neutron source in Hokkaido University. © 2011 IEEE.
  • 廣瀬健太郎, 大島真澄, 北谷文人, 木村敦, 金政浩, 小泉光生, 藤暢輔, 中村詔司, 原かおる, 原田秀郎, 古高和禎, 井頭政之, 片渕竜也, 水本元治, 加美山隆, 木野幸一, 鬼柳善明, 堀順一 日本原子力学会秋の大会予稿集(CD-ROM) 2011 ROMBUNNO.J40 2011年09月02日 [査読無し][通常論文]
  • Y. Kiyanagi, T. Kamiyama, H. Sato, T. Shinohara, T. Kai, K. Aizawa, M. Arai, M. Harada, K. Sakai, K. Oikawa, M. Ohi, F. Maekawa, T. Sakai, M. Matsubayashi, M. Segawa, M. Kureta NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 651 (1) 16 -20 2011年09月 [査読無し][通常論文]
     
    We have a plan to build an imaging beam line, Energy-Resolved Neutron Imaging System (ERNIS), at Materials and Life Science Experimental Facility (MLF) at Japan Proton Accelerator Research Complex (J-PARC). In pulsed neutron imaging, we use characteristic features of the neutron total cross section, depending on the neutron wavelength, to get sample information such as crystallographic structure and nuclide composition. One of the most important items to be determined for a beam line at J-PARC is the choice of moderator among coupled, decoupled, and poisoned moderators. From the wavelength resolution point of view, we decided to use the decoupled moderator, which could cover major experiments performed at a pulsed neutron source. Here, we discuss the structure of the imaging beam line at beam line 22 of the J-PARC neutron source as well as the arrangement of insertion devices and the experimental area. (C) 2011 Elsevier B.V. All rights reserved.
  • 鬼柳 善明, 加美山 隆 波紋 21 (3) 174 -179 2011年08月
  • Y. Kiyanagi, K. Kino, M. Furusaka, F. Hiraga, T. Kamiyama, K. Kato, M. Igashira, T. Katabuchi, M. Mizumoto, M. Oshima, H. Harada, J. Katakura, K. Furutaka, S. Goko, A. Kimura, T. Kin, F. Kitatani, M. Koizumi, S. Nakamura, M. Ohta, Y. Toh, T. Ohtsuki, K. Hirose, T. Fujii, J. Hori, K. Takamiya, S. Fukutani, M. Shibata, K. Yamada, H. Utsunomiya JOURNAL OF THE KOREAN PHYSICAL SOCIETY 59 (2) 1781 -1784 2011年08月 [査読無し][通常論文]
     
    A project on the comprehensive nuclear data research for the development of the advanced reactor systems had been executed successfully by eight organizations from 2005 to 2009. In this project, we constructed a pulsed neutron beamline that was aimed to obtain neutron capture cross-sections of long-lived fission products and minor actinides accurately. The energy spectra, spatial distributions, and pulses of the beam were studied by measurements and simulation calculations, and they were found to be consistent with those of the beamline design. In this paper, we present the overview of the project and the properties of the neutron beam provided by this beam line.
  • H. Harada, S. Goko, A. Kimura, M. Ohta, M. Oshima, F. Kitatani, Y. Toh, K. Furutaka, T. Kin, M. Koizumi, S. Nakamura, M. Igashira, T. Katabuchi, M. Mizumoto, T. Ohsaki, J. Hori, T. Fujii, K. Takamiya, J. Goto, Y. Kiyanagi, K. Kino, M. Furusaka, F. Hiraga, T. Kamiyama JOURNAL OF THE KOREAN PHYSICAL SOCIETY 59 (2) 1547 -1552 2011年08月 [査読無し][通常論文]
     
    The 4 pi Ge spectrometer composed of 22-30 Ge detectors was developed, and it has been used to study neutron capture reactions with a neutron time-of-flight (TOF) technique. Since the distances between the sample position and the Ge detectors are variable, it can be used as a multifunctional spectrometer. At first, it was used as a sum energy spectrometer, and resonances in (nat)Ag were identified as those of (107)Ag or (109)Ag. In second, it was used to deduce gamma-ray intensity distribution for each resonance, and the results for (238)U were presented. In third, it was used to measure neutron capture cross sections of minor actinides and fission products at the electron linear accerelator facility of KURRI and at the accurate neutron-nucleus reaction measurement instrument (ANNRI) in MLF of J-PARC. The preliminary results are discussed mainly based on measurements of neutron capture cross section for (241)Am, together with related techniques.
  • T. Kin, K. Furutaka, S. Goko, H. Harada, A. Kimura, F. Kitatani, S. Nakamura, M. Ohta, M. Oshima, Y. Toh, J. Hori, M. Igashira, T. Katabuchi, M. Koizumi, M. Mizumoto, T. Kamiyama, K. Kino, Y. Kiyanagi JOURNAL OF THE KOREAN PHYSICAL SOCIETY 59 (2) 1769 -1772 2011年08月 [査読無し][通常論文]
     
    A "4 pi germanium spectrometer" was developed for measurements of neutron capture cross sections of minor actinides and long-lived fission products. It was installed on the Beam Line No. 04 of the Materials and Life Science Experimental Facility of the Japan Proton Accelerator Research Complex. The time-of-flight method is used to measure the cross sections. To obtain characteristics of the spectrometer, a measurement was done of prompt gamma rays emitted following neutron capture reactions of gold whose cross section was well studied. In the present paper, we show the procedure of analysis of the data obtained with the spectrometer and discuss the characteristics to measure neutron capture cross section.
  • A. Kimura, K. Furutaka, S. Goko, H. Harada, T. Kin, F. Kitatani, M. Koizumi, S. Nakamura, M. Ohta, M. Oshima, Y. Toh, T. Fujii, S. Fukutani, J. Hori, K. Takamiya, M. Igashira, T. Katabuchi, M. Mizumoto, T. Kamiyama, K. Kino, Y. Kuyanagi JOURNAL OF THE KOREAN PHYSICAL SOCIETY 59 (2) 1828 -1831 2011年08月 [査読無し][通常論文]
     
    For developments of innovative nuclear reactors, strong demands exist for the improvement of the accuracy of the neutroncapture cross sections of minor actinides (MAs) and long-lived fission products. We have constructed a Ge-spectrometer using the Accurate Neutron-Nucleus Reaction measurement Instrument (ANNRI) in the J-PARC materials and life science experimental facility (MLF). Preliminary neutroncapture cross sections of Cm-244 and Cm-246 were obtained in the neutron energy range from 1.0 eV up to 300 eV.
  • J. Hori, K. Furutaka, S. Goko, H. Harada, A. Kimura, T. Kin, F. Kitatani, M. Koizumi, S. Nakamura, M. Ohta, M. Oshima, Y. Toh, M. Igashira, T. Katabuchi, M. Mizumoto, T. Kamiyama, K. Kino, Y. Kiyanagi JOURNAL OF THE KOREAN PHYSICAL SOCIETY 59 (2) 1777 -1780 2011年08月 [査読無し][通常論文]
     
    The prompt gamma rays from the neutron capture reactions by Zr-91 and Zr-96 were measured. A neutron time-of-flight (TOF) method was adopted with a 4 pi Ge spectrometer installed at the Accurate Neutron-Nucleus Reaction measurement Instrument (ANNRI) in the J-PARC Material and Life science experimental Facility (MLF). The gamma-ray pulse-height spectra corresponding to the 292-eV resonance of Zr-91 and the 301-eV resonance of Zr-96 were obtained by gating on the TOP regions, respectively. The relative intensities of those transitions were derived. Moreover, we have demonstrated the nuclide discrimination technique by identifying Zr-91 resonances (isotopic composition of 5.3%) in the measurement of Zr-96 sample. This technique can be applicable to the neutron capture measurement for a small amount of sample expected in case of long-lived fission products (LLFPs) such as Zr-93.
  • S. Nakamura, K. Furutaka, S. Goko, H. Harada, A. Kimura, T. Kin, F. Kitatani, M. Koizumi, M. Ohta, M. Oshima, Y. Toh, J. Hori, T. Fujit, S. Fukutani, K. Takamiya, M. Igashira, T. Katabuchi, M. Mizumoto, T. Kamiyama, K. Kino, Y. Kiyanagi JOURNAL OF THE KOREAN PHYSICAL SOCIETY 59 (2) 1773 -1776 2011年08月 [査読無し][通常論文]
     
    The operation of a new experimental apparatus called "Accurate Neutron-Nucleus Reaction measurement Instrument (ANNRI)" in the Material and Life science experimental Facility (MU) at the Japan Proton Accelerator Research Complex (J-PARC) has been started for neutroncapture crosssection measurements of minor actinides and long-lived fission products. As a part of the measurements, we have measured the time-of-flight spectra of palladium-105, 106, 107 and 108 with a "4 pi Ge spectrometer" installed at the ANNRI. We obtained preliminary results of the cross sections for palladium-107 and 105 in neutron energies ranging from 0.1 eV to 300 eV.
  • 甲斐哲也, 大井元貴, 及川健一, 前川藤夫, 原田正英, 篠原武尚, 鬼柳善明, 加美山隆, 佐藤博隆, 呉田昌俊, 瀬川麻里子, 橋本英子, 松林政仁, 酒井卓郎, 大下英敏, 宇野彰二, 大友季哉 日本原子力研究開発機構JAEA-Review(Web) (2011-014) 2.4.14 (WEB ONLY) 2011年06月 [査読無し][通常論文]
  • 堀順一, 高宮幸一, 福谷哲, 藤井俊行, 太田雅之, 大島真澄, 北谷文人, 木村敦, 金政浩, 小泉光生, 後神進史, 藤暢輔, 中村詔司, 原田秀郎, 古高和禎, 井頭政之, 片渕竜也, 水本元治, 加美山隆, 木野幸一, 鬼柳善明, 平賀富士夫, 古坂道弘 日本原子力研究開発機構JAEA-Review(Web) (2011-014) WEB ONLY 2.4.3 2011年06月 [査読無し][通常論文]
  • 木村敦, 太田雅之, 大島真澄, 北谷文人, 金政浩, 小泉光生, 後神進史, 藤暢輔, 中村詔司, 原田秀郎, 古高和禎, 井頭政之, 片渕竜也, 水本元治, 加美山隆, 木野幸一, 鬼柳善明, 高宮幸一, 福谷哲, 藤井俊行, 堀順一 日本原子力研究開発機構JAEA-Review(Web) (2011-014) WEB ONLY 2.4.2 2011年06月 [査読無し][通常論文]
  • 鬼柳善明, 加美山隆, 木野幸一, 古坂道弘, 平賀富士夫, 藤田文行, 井頭政之, 片渕竜也, 水本元治, 太田雅之, 大島真澄, 北谷文人, 木村敦, 金政浩, 小泉光生, 後神進史, 藤暢輔, 中村詔司, 原田秀郎, 古高和禎 日本原子力研究開発機構JAEA-Review(Web) (2011-014) 2.4.1 (WEB ONLY) 2011年06月 [査読無し][通常論文]
  • Kazuaki Kosako, Koji Oishi, Takashi Nakamura, Masashi Takada, Kouichi Sato, Takashi Kamiyama, Yoshiaki Kiyanagi JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY 48 (2) 227 -236 2011年02月 [査読無し][通常論文]
     
    Following the angular distribution measurement of bremsstrahlung, we measured the angular distribution of photoneutrons between 0 and 120 degrees from copper and tungsten targets bombarded by 18, 28, and 38 MeV electrons at the electron linac of Hokkaido University. The activation detectors and neutron dosimeters were applied to the measurement. The measured results were compared with the results calculated with the Monte Carlo code MCNP5 to verify the calculated results. The calculated results of both the reaction and ambient dose equivalent rates were in good agreement with the measured ones between 20 and 120 degrees in the cases of 28 and 38 MeV electrons, but the calculation underestimated the measured data by a factor of 1.5 to 2.5 for 18 MeV electrons. A large disagreement was observed at small forward angles of around 0 degrees. It was clarified that this disagreement was due to the contributions of photonuclear reactions in the detectors and dosimeters themselves, and of (e,n) reactions in the target.
  • K. Kino, M. Furusaka, F. Hiraga, T. Kamiyama, Y. Kiyanagi, K. Furutaka, S. Goko, H. Harada, M. Harada, T. Kai, A. Kimura, T. Kin, F. Kitatani, M. Koizumi, F. Maekawa, S. Meigo, S. Nakamura, M. Ooi, M. Ohta, M. Oshima, Y. Toh, M. Igashira, T. Katabuchi, M. Mizumoto NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 626 58 -66 2011年01月 [査読無し][通常論文]
     
    We measured the energy spectra and spatial distributions of the neutron beam of Accurate Neutron-Nucleus Reaction Measurement Instrument (ANNRI) at the Japan Proton Accelerator Research Complex/Materials and Life Science Experimental Facility (J-PARC/MLF). Our research team designed and built ANNRI to measure nuclear data with high precision. The measurements of the neutron beam were performed on three types of beams provided by ANNRI in the neutron energy range from 1.5 meV to 10 keV. The energy spectra show a typical feature of para-hydrogen moderator, and the absolute intensities almost agree with predictions based on both a simulation calculation of the Japan Spallation Neutron Source (JSNS) and a neutron transmission calculation of the beamline. The available neutron intensities at 21.5 m are 7.5 x 10(5), 1.6 x 10(4), and 1.1 x 10(5) n/cm(2)/s in the energy ranges 1.5-25 meV, 0.9-1.1 eV, and 0.9-1.1 keV, respectively, under the 17.5 kW JSNS operation. The measured spatial distributions of the beams formed by three different collimators are consistent with those expected from the collimator-system design of the beamline. The beam sizes in FWHM are about 29, 14, and 11 mm for the three different beam collimators. The edges of the spatial distributions are relatively sharp, enabling us to measure the nuclear data successfully. (C) 2010 Elsevier B.V. All rights reserved.
  • 横尾 哲也, 伊藤 晋一, 佐藤 卓, 佐藤 節失, 矢野 真一郎, 川名 大地, 鈴木 純一, 上野 健治, 桑原 慶太郎, 加美山 隆, 岩佐 和晃, 大山 研司, 川村 義久, 浅見 俊夫, 杉浦 良介 日本物理学会講演概要集 65 (2) 912 -912 2010年08月18日
  • 加美山隆, 佐藤博隆, 鬼柳善明, 岩瀬謙二, HARJO Stefanus, 相澤一也, 高田慎一 日本材料学会学術講演会講演論文集 59th 303 -304 2010年05月21日 [査読無し][通常論文]
  • 木村敦, 太田雅之, 大島真澄, 北谷文人, 金政浩, 小泉光生, 後神進史, 藤暢輔, 中村詔司, 原田秀郎, 古高和禎, 井頭政之, 片渕竜也, 水本元治, 加美山隆, 鬼柳善明, 木野幸一, 平賀富士夫, 古坂道弘, 堀順一 日本原子力学会春の年会予稿集(CD-ROM) 2010 ROMBUNNO.B43 2010年03月09日 [査読無し][通常論文]
  • 大島真澄, 太田雅之, 北谷文人, 木村敦, 金政浩, 小泉光生, 後神進史, 藤暢輔, 中村詔司, 原田秀郎, 古高和禎, 加美山隆, 木野幸一, 鬼柳善明, 古坂道弘, 井頭政之, 片渕竜也, 水本元治 日本原子力学会春の年会予稿集(CD-ROM) 2010 ROMBUNNO.B41 2010年03月09日 [査読無し][通常論文]
  • 木野幸一, 加美山隆, 鬼柳善明, 平賀富士夫, 古坂道弘, 太田雅之, 大島真澄, 北谷文人, 木村敦, 金政浩, 小泉光生, 後神進史, 藤暢輔, 中村詔司, 原田秀郎, 古高和禎, 井頭政之, 片渕竜也, 水本元治 日本原子力学会春の年会予稿集(CD-ROM) 2010 ROMBUNNO.B40 2010年03月09日 [査読無し][通常論文]
  • 伊藤 晋一, 横尾 哲也, 佐藤 卓, 矢野 真一郎, 佐藤 節夫, 鈴木 純一, 上野 健治, 桑原 慶太郎, 岩佐 和晃, 加美山 隆, 山室 修, 大山 研司, 大友 季哉, 遠藤 康夫, 秋光 純, 黒田 眞司, 佐藤 和則, 那須 奎一郎, 岩野 薫, 大原 泰明, 吉澤 英樹, 川村 義久, 浅見 俊夫, 杉浦 良介 日本物理学会講演概要集 65 (1) 1015 -1015 2010年03月01日
  • 鬼柳善明, 木野幸一, 古坂道弘, 加美山隆, 平賀富士夫, 井頭政之, 片渕竜也, 水本元治, 大島真澄, 原田秀郎, 木村敦, 金政浩, 後神進史, 太田雅之, 藤暢輔, 小泉光生, 北谷文人, 中村詔司, 古高和禎 波紋 20 (1) 21 -24 2010年01月20日 [査読無し][通常論文]
  • Experimental investigations for astrophysical photodisintegration reaction rate
    A. Makinaga, K. Kato, T. Kamiyama, K. Yamamoto AIP Conf. Proc. 1269 394 2010年 [査読有り][通常論文]
  • 加美山隆, 佐藤博隆, 鬼柳善明, 岩瀬謙二, HARJO S, 相澤一也, 高田慎一, 伊藤崇芳 日本中性子科学会年会講演概要集 10th 20 2010年 [査読無し][通常論文]
  • 鬼柳 善明, 加美山 隆 非破壊検査 : journal of N.D.I 58 (12) 533 -537 2009年12月01日
  • 太田雅之, 大島真澄, 北谷文人, 木村敦, 金政浩, 小泉光生, 後神進史, 藤暢輔, 中村詔司, 原田秀郎, 古高和禎, 井頭政之, 片渕竜也, 水本元治, 加美山隆, 木野幸一, 鬼柳善明, 平賀富士夫, 古坂道弘 日本原子力学会秋の大会予稿集(CD-ROM) 2009 J15 2009年08月28日 [査読無し][通常論文]
  • 水本元治, 井頭政之, 片渕竜也, 堀順一, 木野幸一, 鬼柳善明, 加美山隆, 平賀富士夫, 古坂道弘, 木村敦, 藤暢輔, 中村詔司, 後神進史, 金政浩, 太田雅之, 北谷文人, 古高和禎, 小泉光生, 原田秀郎, 大島真澄 日本原子力学会秋の大会予稿集(CD-ROM) 2009 J14 2009年08月28日 [査読無し][通常論文]
  • 木野幸一, 加美山隆, 鬼柳善明, 平賀富士夫, 古坂道弘, 太田雅之, 大島真澄, 北谷文人, 木村敦, 金政浩, 小泉光生, 後神進史, 藤暢輔, 中村詔司, 原田秀郎, 古高和禎, 大井元貴, 甲斐哲也, 原田正英, 前川藤夫, 明午伸一郎, 井頭政之, 片渕竜也, 水本元治 日本原子力学会秋の大会予稿集(CD-ROM) 2009 I43 2009年08月28日 [査読無し][通常論文]
  • 木村敦, 大島真澄, 太田雅之, 北谷文人, 金政浩, 小泉光生, 後神進史, 藤暢輔, 中村詔司, 原田秀郎, 古高和禎, 井頭政之, 片渕竜也, 水本元治, 加美山隆, 木野幸一, 鬼柳善明 日本原子力学会秋の大会予稿集(CD-ROM) 2009 J17 2009年08月28日 [査読無し][通常論文]
  • 篠原武尚, 高田慎一, 相澤一也, 鈴木淳市, 甲斐哲也, 原田正英, 及川健一, 前川藤夫, 酒井健二, 大井元貴, 新井正敏, 神山崇, 呉田昌俊, 酒井卓郎, 松林政仁, 鬼柳善明, 加美山隆, 佐藤博隆 日本物理学会講演概要集 64 (2) 881 2009年08月18日 [査読無し][通常論文]
  • 鬼柳善明, 加美山隆, 佐藤博隆, 篠原武尚, 高田慎一, 相澤一也, 新井正敏, 甲斐哲也, 原田正英, 酒井健二, 及川健一, 大井元貴, 前川藤夫, 林田洋寿, 酒井卓郎, 松林政人, 瀬川麻里子, 呉田昌俊 日本中性子科学会年会講演概要集 9th 43 2009年 [査読無し][通常論文]
  • 木野幸一, 加美山隆, 鬼柳善明, 平賀富士夫, 古坂道弘, 太田雅之, 大島真澄, 北谷文人, 木村敦, 金政浩, 小泉光生, 後神進史, 藤暢輔, 中村詔司, 原田秀郎, 古高和禎, 井頭政之, 片渕竜也, 水本元治 日本原子力学会北海道支部研究発表会講演要旨集 27th 14 -15 2009年 [査読無し][通常論文]
  • 加美山隆, 宮本直樹, 富岡智, 小崎完 日本原子力学会秋の大会予稿集(CD-ROM) 2008 (0) I13 -164 2008年08月21日 [査読無し][通常論文]
     
    本研究では、原子力用途を第一の目的とした核種分布の非破壊分析システムを構築するため、中性子共鳴吸収分光法(Neutron Resonance Absorption Spectroscopy; N-RAS)と計算機断層撮像法(Computer Tomography; CT)法の組み合わせによる分析法(N-RAS/CT)を提案し、実際に北海道大学の45MeV電子線ライナックに中性子共鳴吸収分光器および断層撮像用CTステージを建設した。これを用いて断層撮像用の中性子共鳴吸収スペクトル測定を行うことで、小型加速器中性子源を用いた測定システムにおいて1mm程度の分解能で核種分布の断層イメージング結果が得られた。
  • Y. Kawakita, K. Shibata, T. Kamiyama, S. Takeda Journal of Physics: Conference Series 98 2008年02月01日 [査読無し][通常論文]
     
    The results of inelastic neutron scattering measurements for Ag 2GeSe3 are reported in association with a low energy excitation and Ag diffusion. A low energy excitation peaked at 2.4 meV and underling tail below 10meV are observed from 120K to 300K. Glass structure based on Ge-Se covalent bond persists in this material, that is confirmed by observation of stretching and bending modes of Ge-Se bond. © 2008 IOP Publishing Ltd.
  • 宮本直樹, 小崎完, 富岡智, 加美山隆 日本非破壊検査協会大会講演概要集 2007 335 -338 2007年10月18日 [査読無し][通常論文]
  • 宮本直樹, 小崎完, 富岡智, 加美山隆 日本原子力学会秋の大会予稿集(CD-ROM) 2007 (0) C51 -171 2007年09月07日 [査読無し][通常論文]
     
    中性子共鳴吸収分光法と計算機断層撮像法を組み合わせることにより、非破壊で核種分布を断層撮影することが可能な分析法の開発を目的としている。複数の核種の存在分布、およびその密度分布を再構成できることを示した。
  • 加美山隆, 富岡智, 小崎完 日本原子力学会春の年会要旨集(CD-ROM) 2007 (0) A07 -123 2007年03月06日 [査読無し][通常論文]
     
    中性子共鳴吸収分光法は、パルス中性子源を利用して飛行時間法を適用することにより中性子の共鳴吸収スペクトルを得る分光法で、共鳴吸収ピークのエネルギーの位置や線幅の解析から、試料中に含まれる核種の分析および核種毎の実効温度の分析が可能である。中性子共鳴吸収断面積は核種によって10000barn以上と、通常の散乱断面積に比較して格段に大きく、小型の中性子線源においても効率よく測定することが期待できる。本研究では、中性子共鳴吸収分光器を北海道大学45MeV電子線ライナックに設置して、幾つかの核種について測定を実施した。ここではその結果について報告する。
  • 篠原 武尚, 岩下 秀徳, 鈴木 淳市, 奥 隆之, 加美山 隆久, 岩佐 浩克, 平賀 富士夫, 鬼柳 善明, 佐藤 孝一, 清水 裕彦 日本物理学会講演概要集 62 (1) 949 -949 2007年02月28日
  • 鬼柳 善明, 岩瀬 謙二, 加美山 隆 加速器 4 (2) 123 -130 2007年
  • Development and application of focusing devices for pulsed neutrons
    J. Suzuki, T. Oku, T. Adachi, H.M. Shimizu, Y. Kiyanagi, T. Kamiyama, H. Iwasa, K. Sato, M. Furusaka, K. Niita Proc. of the 17th Meeting of the International Collaboration on Advanced Neutron Sources, Apr. 25-29, 2005, Santa Fe 1072 -1076 2006年 [査読無し][通常論文]
  • Simulation calculations of neutron transport through a pulsed magnetic lens to focus neutron beam from a pulsed neutron source
    Y. Kiyanagi, T. Tanimura, T. Kamiyama, J. Suzuki, T. Oku, H.M. Shimizu Proc. of the 17th Meeting of the International Collaboration on Advanced Neutron Sources, Apr. 25-29, 2005, Santa Fe 710 -713 2006年 [査読無し][通常論文]
  • 川合将義, 仁井田浩二, 前川藤夫, 及川健一, 梶本亮一, 神山崇, 鈴谷賢太郎, 田村昌也, 中島健次, 原田正英 日本原子力学会秋の大会予稿集(CD-ROM) 2005 C24 2005年08月12日 [査読無し][通常論文]
  • 執行信寛, 有馬秀彦, 石橋健二, 上松幹夫, 後藤哲夫, 吉村幸雄, 佐藤光吉, 宮本泰明, 田代清, 須藤収, 堀順一, 中島健, 鬼柳善明, 加美山隆, 佐藤理 日本原子力学会秋の大会予稿集(CD-ROM) 2005 2005年
  • Toru Ishigaki, Hiroyuki Obana, Stefanus Harjo, Masao Yonemura, Kenji Iwase, Junichi Kodama, Takashi Kamiyama ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES 61 C485 -C485 2005年
  • 中性子散乱で見るメタンハイドレートの動的構造
    加美山隆, 鬼柳善明, 岩佐浩克, 内田努, 海老沼孝郎, 成田英夫, Bennington, S. M 低温科学 64 215 -222 2005年 [査読無し][通常論文]
  • Y Nakamura, T Ishigaki, T Kamiyama, E Akiba JOURNAL OF ALLOYS AND COMPOUNDS 384 (1-2) 195 -202 2004年12月 [査読無し][通常論文]
     
    We performed in situ neutron powder diffraction measurements of LaNi4.9Al0.1Dx along the desorption P-C isotherm using 90degrees banks of a TOF diffractometer. Structure of the hydride phase for various hydrogen contents was determined by Rietveld refinement. Variation of hydrogen site occupation in the hydride phase was clearly observed. The full hydride LaNi4.9Al0.1D6.1 has a P6mm structure with four hydrogen sites; 3c sites (O[La2Ni4]) with occupancy of 0.95(2) and three T sites, 6e(1) (T[La2Ni2]), 6e(2) (T[La1Ni3]) and 2b (T[Ni4]), with occupancies of 0.324(6), 0.195(6) and 0.22(1), respectively. In the two-phase region, the hydride phase has the limiting composition LaNi4.9Al0.1D5.0. Decreased hydrogen content from x = 6.1 to 5.0 in the hydride phase involved decrease of occupation in all sites, but behavior of the decrease depended on the sites. The 3c and 6e(1) sites are preferably occupied in the limiting composition, whereas extra occupation caused by hydrogen solution in the hydride single-phase region is most preferable in the 6e(2) Sites. (C) 2004 Elsevier B.V. All rights reserved.
  • 柴田 薫, 筑紫 格, 神山 崇 日本物理学会講演概要集 59 (2) 853 -853 2004年08月25日
  • 加美山 隆, 細川 伸也, Baron A Q R, 筒井 智嗣, 吉田 亨次, 鬼柳 善明, 山口 敏男 日本物理学会講演概要集 59 (2) 296 -296 2004年08月25日
  • Mori, Kazuhiro, Shibata, Koji, Itoh, Keji, Fukunaga, Toshiharu, Sagehashi, Hidenori, Hoshikawa, Akinori, Harjo, Stefanus, Kamiyama, Takashi, Ishigaki, Toru Physica B: Condensed Matter 350 (1-3 SUPPL. 1) 2004年
  • 小村 健, 伊東 一幸, 森吉 千佳子, 池田 進, 加美山 隆, Parker S. F. 日本物理学会講演概要集 58 (2) 845 -845 2003年08月15日
  • T Kamiyama, H Kobayashi, R Kanno, K Oikawa, T Matsumura, S Torii, T Sakai APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 74 (Suppl1) S1219 -S1221 2002年12月 [査読無し][通常論文]
     
    Li1+xMn2-xO4 spinels (x = 0.0-0.1) after storage at several temperatures were investigated by the Rietveld analysis of high-resolution neutron powder diffraction data. With increasing storage temperature in an electrolyte, the Mn site is likely to be more deficient. In chemically Li-deintercalated Li1.03Mn1.97O4, which was used as a model system for studying the stability of charged states with different charge depths, phase separation due to variation of the Li occupancy in the structure proceeded in slightly deintercalated spinels after storage at 80 degreesC.
  • K Oikawa, T Kamiyama, T Mochiku, H Takeya, M Furuyama, S Kamisawa, M Arai, K Kadowaki JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 71 (10) 2471 -2476 2002年10月 [査読無し][通常論文]
     
    The crystal structure of a new superconducting material, MgB2, was studied by high-resolution neutron powder diffraction as a function of temperature from 8 K to 305K. Two samples of (MgB2)-B-11 were measured; one was synthesized for 2 d at 1050degreesC, and the other one was done for I d at 1100degreesC. All of the diffraction data were precisely refined by the Rietveld method, and we confirmed that there was no clear anomaly on the temperature dependence of the lattice constants around T-c for both samples. The difference in sample synthesis procedures affects the profile shapes of the 001 reflections, whereas the hh(0) lines are almost the same.
  • T. Oku, T. Adachi, H. Sato, C. Otani, Y. Takizawa, K. Sakai, H.M. Shimizu, K. Sasaki, H. Iwasa, T. Kamiyama, Y. Kiyanagi, T. Ino, M. Furusaka, J. Suzuki, M. Hino, S. Tasaki, T. Ebisawa Proc. of the International Symposium on Optical Science and Technology, Jul. 29-Aug. 3, 2001, San Diego 96 -105 2002年 [査読無し][通常論文]
  • 正木 匡彦, 青木 拓克, 宗尻 修治, 伊丹 俊夫, 加美山 隆, 石井 慶信 日本物理学会講演概要集 56 (2) 650 -650 2001年09月03日
  • 大山 研司, 小野寺 秀也, 犬童 健太郎, 金子 耕士, 山内 宏樹, 石本 賢一, 加美山 隆, 山口 泰男 日本物理学会講演概要集 56 (2) 399 -399 2001年09月03日
  • 石本 賢一, 今野 潤也, 大山 研司, 大森 隆史, 金子 耕士, 小野寺 秀也, 山口 泰男, 廣田 和馬, 加美山 隆 日本物理学会講演概要集 56 (2) 484 -484 2001年09月03日
  • 石本 賢一, 今野 潤也, 大山 研司, 大森 隆史, 金子 耕士, 小野寺 秀也, 山口 泰男, 廣田 和馬, 加美山 隆 日本物理学会講演概要集 56 (1) 500 -500 2001年03月09日
  • 正木 匡彦, 宗尻 修治, 石井 慶信, 加美山 隆, 伊丹 俊夫 日本物理学会講演概要集 56 (1) 714 -714 2001年03月09日
  • 佐々木 敬太, 小池 元, 廣田 智章, 岩佐 浩克, 加美山 隆, 鬼柳 義明, 奥 隆之, 安達 智宏, 清水 裕彦, 日野 正裕, 田崎 誠司, 海老沢 徹, 猪野 隆, 古坂 道弘, 鈴木 淳市 日本物理学会講演概要集 56 (1) 889 -889 2001年03月09日 [査読無し][通常論文]
  • 石本 賢一, 大森 隆史, 金子 耕士, 大山 研司, 小野寺 秀也, 山口 泰男, 廣田 和馬, 加美山 隆 日本物理学会講演概要集 55 (2) 385 -385 2000年09月10日
  • 間所 靖, 山室 修, 山崎 浩崇, 松尾 隆祐, 筑紫 格, 國分 博人, 加美山 隆, 池田 進 日本物理学会講演概要集 55 (1) 303 -303 2000年03月10日
  • 奥 隆之, 清水 裕彦, 加藤 博, 大谷 知行, 佐藤 広海, 池田 時浩, 廣田 智章, 岩佐 浩克, 加美山 隆, 鬼柳 善明, 若林 利男, 猪野 隆, 鈴木 淳市 日本物理学会講演概要集 54 (2) 425 -425 1999年09月03日 [査読無し][通常論文]
  • 金子 耕士, 加美山 隆, 鬼柳 善明, 河村 純一, 佐久間 隆, 池田 進 日本物理学会講演概要集 54 (1) 215 -215 1999年03月15日
  • 奥 隆之, 清水 裕彦, 加藤 博, 大谷 知行, 佐藤 広海, 中川 晴子, 須田 義之, 小川 雪郎, 岩佐 浩克, 加美山 隆, 鬼柳 善明, 若林 利男 日本物理学会講演概要集 54 (1) 365 -365 1999年03月15日 [査読無し][通常論文]
  • P. O. Maurin, P. O. Maurin, J. F. Jal, J. Dupuy-Philon, N. Asahi, J. Kawamura, T. Kamiyama, Y. Nakamura Berichte der Bunsengesellschaft/Physical Chemistry Chemical Physics 102 152 -155 1998年12月01日 [査読無し][通常論文]
     
    The temperature dependences of the self-diffusion coefficient and the spin-lattice relaxation time have been studied by NMR measurements performed on a good glass former LICl-6H2O. The spin-lattice relaxation time can be separated into two relaxation processes, i.e., inter- and intramolecular processes. We have related these relaxation processes to the translational diffusion which corresponds to the primary or α-relaxation and to the local motions which are related to the β-relaxation in glass forming systems. The results throw some light to the evolution with temperature of these relaxation processes in the LiCl-6H2O system over the normal liquid, supercooled liquid and glass sates. © WILEY-VCH Verlag GmbH, 1998.
  • 金子 耕士, 加美山 隆, 鬼柳 善明, 池田 進, 佐久間 隆 日本物理学会講演概要集 53 (2) 251 -251 1998年09月05日
  • 清水 裕彦, 加藤 博, 奥 隆之, 大谷 知行, 佐藤 広海, 須田 義之, 中川 晴子, 小川 富郎, 岩佐 浩克, 加美山 隆, 鬼柳 善明, 若林 利男 日本物理学会講演概要集 53 (2) 414 -414 1998年09月05日 [査読無し][通常論文]
  • 柴田 薫, 加美山 隆, 鈴木 謙爾 日本物理学会講演概要集 53 (0) 707 -707 1998年 [査読無し][通常論文]
  • 吉田勝美, 加美山隆, 柴田薫, 古坂道弘, 今井正幸, 丸山健二, 三沢正勝 溶液化学シンポジウム講演要旨集 19th 190 -191 1996年11月 [査読無し][通常論文]
  • 加美山 隆, 柴田 薫, 鈴木 謙爾 まてりあ : 日本金属学会会報 34 (1) 36 -45 1995年01月20日 [査読無し][通常論文]
  • 荒川 幸一, 河村 純一, 加美山 隆, 中村 義男 日本物理学会講演概要集. 秋の分科会 1994 (2) 198 -198 1994年08月16日
  • 加美山 隆, 柴田 薫, 鈴木 謙爾 物性研究 62 (2) p318 -320 1994年05月 [査読無し][通常論文]
     
    この論文は国立情報学研究所の電子図書館事業により電子化されました。
  • 都築 拓也, 八尾 誠, 川北 至信, 野口 健宏, 遠藤 裕久, 柴田 薫, 加美山 隆, 三沢 正勝, 鈴木 謙爾 日本物理学会講演概要集. 年会 49 (0) 264 -264 1994年 [査読無し][通常論文]
  • 加美山隆, 柴田薫, 鈴木謙爾, 中村義男 日本金属学会講演概要 113th 451 1993年09月 [査読無し][通常論文]
  • 加美山隆, 柴田薫, 鈴木謙爾 溶融塩化学討論会要旨集 22nd 51 -52 1990年11月 [査読無し][通常論文]
  • 柴田 薫, 加美山 隆, 鈴木 謙爾, 井上 和彦 年会講演予稿集 44 (0) 170 -170 1989年 [査読無し][通常論文]
  • 柴田 薫, 加美山 隆, 鈴木 謙爾, 井上 和彦 秋の分科会講演予稿集 1988 (3) 180 -180 1988年09月16日

特許

共同研究・競争的資金等の研究課題

  • 中性子散乱に関する研究
  • 液体とガラスの動的構造に関する研究
  • Study of Neutron Scattering
  • Study on Dynamic Structures of Liquids and Glasses

教育活動情報

主要な担当授業

  • 量子ビーム計測工学特論
    開講年度 : 2021年
    課程区分 : 修士課程
    開講学部 : 工学院
    キーワード : 放射線計測、統計、ガス検出器、シンチレーション検出器、半導体検出器、スペクトル測定、中性子計測
  • 医理工放射線物理学
    開講年度 : 2021年
    課程区分 : 修士課程
    開講学部 : 医理工学院
    キーワード : 放射線物理学、放射線の種類と生成、荷電粒子と物質の相互作用、光子と物質の相互作用、中性子と物質の相互作用
  • 大学院共通授業科目(一般科目):自然科学・応用科学
    開講年度 : 2021年
    課程区分 : 修士課程
    開講学部 : 大学院共通科目
    キーワード : 放射線物理学、放射線の種類と生成、放射線と物質の相互作用
  • 大学院共通授業科目(一般科目):自然科学・応用科学
    開講年度 : 2021年
    課程区分 : 修士課程
    開講学部 : 大学院共通科目
    キーワード : 荷電粒子と物質の相互作用、光子と物質の相互作用、中性子と物質の相互作用
  • 放射線物理学特論
    開講年度 : 2021年
    課程区分 : 修士課程
    開講学部 : 工学院
    キーワード : 放射線物理学、放射線の種類と生成、荷電粒子と物質の相互作用、光子と物質の相互作用、中性子と物質の相互作用
  • 物質構造科学特論
    開講年度 : 2021年
    課程区分 : 修士課程
    開講学部 : 工学院
    キーワード : 中性子源,中性子散乱,パルス中性子,TOF法,放射光,弾性散乱と非弾性散乱,結晶学,構造解析
  • 量子ビーム計測工学特論
    開講年度 : 2021年
    課程区分 : 博士後期課程
    開講学部 : 工学院
    キーワード : 放射線計測、統計、ガス検出器、シンチレーション検出器、半導体検出器、スペクトル測定、中性子計測
  • 放射線物理学特論
    開講年度 : 2021年
    課程区分 : 博士後期課程
    開講学部 : 工学院
    キーワード : 放射線物理学、放射線の種類と生成、荷電粒子と物質の相互作用、光子と物質の相互作用、中性子と物質の相互作用
  • 物質構造科学特論
    開講年度 : 2021年
    課程区分 : 博士後期課程
    開講学部 : 工学院
    キーワード : 中性子源,中性子散乱,パルス中性子,TOF法,放射光,弾性散乱と非弾性散乱,結晶学,構造解析
  • 統計力学
    開講年度 : 2021年
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : エントロピー、自由エネルギー、微視的状態、ボルツマン分布、分配関数
  • 化学Ⅰ
    開講年度 : 2021年
    課程区分 : 学士課程
    開講学部 : 全学教育
    キーワード : 原子の構造、原子軌道、化学結合、混成軌道、物質の三態、電解質溶液
  • 一般教育演習(フレッシュマンセミナー)
    開講年度 : 2021年
    課程区分 : 学士課程
    開講学部 : 全学教育
    キーワード : 放射線、放射能、放射線被ばく、放射線医療、原子炉、環境放射能、放射性廃棄物処理・処分、廃炉工学、オープン教材
  • 科学・技術の世界
    開講年度 : 2021年
    課程区分 : 学士課程
    開講学部 : 全学教育
    キーワード : 原子力技術、原子力発電、放射線、医療応用、宇宙探査、材料開発
  • 一般教育演習(フレッシュマンセミナー)
    開講年度 : 2021年
    課程区分 : 学士課程
    開講学部 : 全学教育
    キーワード : 量子ビーム、プラズマ、触媒、ナノ材料

大学運営

委員歴

  • 2002年   日本中性子科学会   地区編集委員   日本中性子科学会


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