MF研究者総覧

Researcher Database

Advance
Researchers' Page on researchmap
Last Updated :2024/10/06

Researcher Profile and Settings

Master

Affiliation (Master)

  • Faculty of Engineering　Applied Quantum Science and Engineering　Quantum Engineering for Materials

Affiliation (Master)

  • Faculty of Engineering　Applied Quantum Science and Engineering　Quantum Engineering for Materials

researchmap

Profile and Settings

Degree

  • (BLANK)（Tohoku University）
  • (BLANK)（Tohoku University）

Profile and Settings

  • Name (Japanese)

    Kamiyama

  • Name (Kana)

    Takashi

  • Name

    200901029721874792

Achievement

Research Interests

  • 結晶組織   neutron imaging   動的構造   ガラス   液体   Dynamical Structure   Glass   Liquid   

Research Areas

  • Energy / Quantum beam science / Neutron engineering
  • Nanotechnology/Materials / Inorganic materials
  • Nanotechnology/Materials / Basic physical chemistry
  • Natural sciences / Mathematical physics and basic theory

Research Experience

  • 2019/04 - Today 北海道大学大学院 教授
  • 2005/04 - 2019/03 北海道大学大学院 准教授
  • 1996/04 - 2005/03 - 北海道大学大学院 助教授
  • 1991 - 1996 Hokkaido University
  • 1991 - 1996 Hokkaido University, Research Assistant
  • 1996 - Hokkaido University, Associate Professor

Education

  •        - 1991  Tohoku University
  •        - 1991  Tohoku University  Graduate School, Division of Engineering
  •        - 1987  Tohoku University  Faculty of Engineering
  •        - 1987  Tohoku University  Faculty of Engineering

Awards

  • 2016/09 日本金属学会 第64回 論文賞
     Relation between Vickers Hardness and Bragg-Edge Broadening in Quenched Steel Rods Observed by Pulsed Neutron Transmission Imaging (Materials Transactions, Vol.56, No.8) 
    受賞者: 佐藤博隆;佐藤友哉;塩田佳徳;加美山隆;Anton S. Tremsin;大沼正人;鬼柳善明
  • 2012/09 日本金属学会 第60回 論文賞
     A Rietveld-Type Analysis Code for Pulsed Neutron Bragg-Edge Transmission Imaging and Quantitative Evaluation of Texture and Microstructure of a Welded alpha-Iron Plate (Materials Transactions, Vol.52) 
    受賞者: 佐藤博隆;加美山隆;鬼柳善明

Published Papers

  • Z. Lan, Y. Arikawa, S. R. Mirfayzi, A. Morace, T. Hayakawa, H. Sato, T. Kamiyama, T. Wei, Y. Tatsumi, M. Koizumi, Y. Abe, S. Fujioka, K. Mima, R. Kodama, A. Yogo
    Nature Communications 15 5365  2024 [Refereed][Not invited]
  • H. Sato, T. Kamiyama, H. Nagakura, K. Sato, M. Ohnuma, M. Furusaka
    EPJ Web of Conferences 298 05006  2024 [Refereed][Not invited]
  • H. Iwashita, R. Kiuchi, Y. Hiroshima, Y. Okugawa, T. Sebe, M. Takeda, H. Sato, T. Kamiyama, M. Furusaka, Y. Kiyanagi
    IEEE Transactions on Nuclear Science 70 (3) 216 - 221 0018-9499 2023/12 [Refereed][Not invited]
  • H. Sato, M. Miyoshi, R. S. Ramadhan, W. Kockelmann, T. Kamiyama
    Scientific Reports 13 688  2023 [Refereed][Not invited]
  • Hirotaka Sato, Atsuya Kusumi, Yoshinori Shiota, Hirotoshi Hayashida, Yuhua Su, Joseph Don Parker, Kenichi Watanabe, Takashi Kamiyama, Yoshiaki Kiyanagi
    ISIJ International 0915-1559 2022 [Refereed]
  • Takashi Kamiyama, Kazuma Hirano, Hirotaka Sato, Kanta Ono, Yuta Suzuki, Daisuke Ito, Yasushi Saito
    Applied Sciences 11 (13) 5988 - 5988 2021/06/27 [Refereed]
     
    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 2021/06/04 [Refereed]
     
    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 0167-7322 2021/06 [Refereed]
     
    The dynamic structure factors S(Q,ω) of liquid acetone were measured in a wide Q range 1.9–41.2 nm−1 with a high-resolution inelastic X-ray scattering (IXS) spectrometer installed at BL35XU of the SPring-8. Highly damped collective excitations of the longitudinal acoustic (LA) phonons are observed. The IXS spectra were analyzed by using a generalized Langevin formalism with the help of a sparse modeling to deduce reasonable Q dependences of the fitting parameters. The dispersion relation of the LA phonon excitations shows a highly positive deviation by about 65% from the adiabatic velocity of sound, which is larger than that in non-polar liquids such as CCl4 and benzene with van der Waals interactions, due probably that the acetone is a polar liquid. Microscopic dynamic parameters, such as viscoelastic relaxation rates and viscosity, are discussed by comparing with existing macroscopic dynamic properties. The fast and slow viscoelastic relaxations correspond to the vibration dynamics and reorientation correlations, respectively.
  • Hirotaka Sato, Miyuki Sato, Yuhua Su, Takenao Shinohara, Takashi Kamiyama
    ISIJ International 61 (5) 1584 - 1593 0915-1559 2021/05/15 [Refereed]
  • 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) 2021/03/26
  • H. Sato, K. Iwase, T. Kamiyama, Y. Kiyanagi
    ISIJ International 60 (6) 2020/12 [Refereed][Not invited]
  • 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 0018-9499 2020/11 [Refereed]
  • 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 2020/08/04 
    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 0034-6748 2020/04/01 [Refereed][Not invited]
  • Kaoru Y. Hara, Minoru Asako, Tetsuya Kai, Hiroaki Sato, Takashi Kamiyama
    2019 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2019 2019/10/01 
    Tantalum-181 is a typically used nucleus for neutron resonance thermometry. To develop an imaging technique of neutron resonance thermometry, the neutron transmission spectrum for a tantalum foil which was set up in a constant-temperature furnace was measured by the time-of-flight (TOF) method. The thickness of the tantalum sample was 30 or 300 μm. Several temperature conditions were set from 20 to 500°C. A gas electron multiplier (GEM) neutron detector was used. The measurements were performed on the 10th beam line (BL10) of the Material and Life science experimental Facility (MLF) at the Japan Proton Accelerator Research Complex (J-PARC). To cut-off neutrons below thermal neutron energy, a cadmium filter was inserted on the neutron beam line. The measured neutron transmission spectrum in the eV energy region was compared to the calculated one with the PHITS code. In the calculation, the time distribution of neutron emission from a source was defined as the pulse function of BL10. The distance from the source to a tally was 14.5 m. The evaluated nuclear data of ENDF/B-VIII.0 or JENDL-4.0 were utilized for each calculation with respect to the neutron-induced nuclear reactions of Ta-181. The differences in the calculated neutron transmission spectra due to the evaluated nuclear data are discussed based on the measured spectra.
  • Hirotaku Ishikawa, Tetsuya Kai, Hirotaka Sato, Takashi Kamiyama
    Journal of Nuclear Science and Technology 56 (2) 221 - 227 0022-3131 2019/02 [Refereed][Not invited]
  • 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 [Refereed][Not invited]
  • 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 [Not refereed][Invited]
  • H.Sato, T. Sasaki, T. Moriya, H. Ishikawa, T. Kamiyama, M. Furusaka
    Physica B: Condensed Matter 551 452 - 459 0921-4526 2018/12/15 [Refereed][Not invited]
  • 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 2018/11/12 
    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 1349-046X 2018/05/10 [Refereed][Not invited]
  • 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 0367-5866 2018/05 [Not refereed][Not invited]
  • 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 [Refereed][Not invited]
  • 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 [Refereed][Not invited]
  • Hirotaku Ishikawa, Hirotaka Sato, Takashi Kamiyama
    Physica B: Condensed Matter 551 355 - 358 0921-4526 2018 [Refereed][Not invited]
     
    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 1600-5767 2017/12 [Refereed][Not invited]
     
    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.
  • Kenji Nakajima, Yukinobu Kawakita, Shinichi Itoh, Jun Abe, Kazuya Aizawa, Hiroyuki Aoki, Hitoshi Endo, Masaki Fujita, Kenichi Funakoshi, Wu Gong, Masahide Harada, Stefanus Harjo, Takanori Hattori, Masahiro Hino, Takashi Honda, Akinori Hoshikawa, Kazutaka Ikeda, Takashi Ino, Toru Ishigaki, Yoshihisa Ishikawa, Tetsuya Kai, Ryoichi Kajimoto, Takashi Kamiyama, Naokatsu Kaneko, Daichi Kawana, Seiko Ohira‐Kawamura, Takuro Kawasaki, Atsushi Kimura, Ryoji Kiyanagi, Kenji Kojima, Katsuhiro Kusaka, Sanghyun Lee, Shinichi Machida, Takatsugu Masuda, Kenji Mishima, Koji Mitamura, Mitsutaka Nakamura, Shoji Nakamura, Akiko Nakao, Tatsuro Oda, Takashi Ohhara, Hidetoshi Ohshita, Kenichi Oikawa, Toshiya Otomo, Asami Sano‐Furukawa, Kaoru Shibata, Takenao Shinohara, Kazuhiko Soyama, Jun‐ichi Suzuki, Kentaro Suzuya, Atsushi Takahara, Shin‐ichi Takata, Masayasu Takeda, Yosuke Toh, Shuki Torii, Naoya Torikai, Norifumi L. Yamada, Taro Yamada, Dai Yamazaki, Tetsuya Yokoo, Masao Yonemura, Hideki Yoshizawa
    Quantum Beam Sci. 2017 (1) 9 - 9 2017/11 [Refereed][Not invited]
  • Kaoru Y. Hara, Hirotaka Sato, Takashi Kamiyama, Takenao Shinohara
    EPJ Web of Conferences 146 2100-014X 2017/09/13 [Refereed][Not invited]
     
    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 2017/03 [Refereed][Not invited]
  • Daisuke Ito, Tadafumi Sano, Jun Ichi Hori, Yoshiyuki Takahashi, Hiroyuki Hasemi, Takashi Kamiyama, Ken Nakajima
    Physics Procedia 88 89 - 94 1875-3884 2017 [Refereed][Not invited]
     
    © 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 [Not refereed][Not invited]
  • 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 [Not refereed][Not invited]
  • 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 1875-3892 2017 [Refereed][Not invited]
     
    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 1875-3892 2017 [Refereed][Not invited]
     
    The spatial-dependent lattice spacing and microstructure of an -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 alpha-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. (C) 2017 The Authors. Published by Elsevier B.V.
  • Takashi Kamiyama, Yuki Narita, Hirotaka Sato, Masato Ohnuma, Yoshiaki Kiyanagi
    Physics Procedia 88 27 - 33 1875-3892 2017 [Refereed][Not invited]
     
    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 1875-3892 2017 [Refereed][Not invited]
     
    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 0018-9499 2017/01 [Refereed][Not invited]
     
    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  1742-6596 2016/10/10 [Refereed][Not invited]
     
    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.
  • 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 [Refereed][Not invited]
  • 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 [Refereed][Not invited]
  • 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 [Refereed][Not invited]
  • 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 [Not refereed][Not invited]
  • 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 [Refereed][Not invited]
  • 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 [Not refereed][Invited]
  • 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  0556-2813 2015/03 [Refereed][Not invited]
     
    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.
  • Hirotaka Sato, Yoshinori Shiota, Takenao Shinohara, Takashi Kamiyama, Masato Ohnuma, Michihiro Furusaka, Yoshiaki Kiyanagi
    Physics Procedia 69 349 - 357 1875-3884 2015/01/01 [Refereed][Not invited]
     
    © 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 [Not refereed][Not invited]
  • 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 [Not refereed][Invited]
  • K. Mochiki, K. Ishizuka, K. Morikawa, T. Kamiyama, Y. Kiyanagi
    PROCEEDINGS OF THE 10TH WORLD CONFERENCE ON NEUTRON RADIOGRAPHY (WCNR-10) 69 143 - 151 1875-3892 2015 [Refereed][Not invited]
     
    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 1875-3892 2015 [Refereed][Not invited]
     
    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 1875-3892 2015 [Refereed][Not invited]
     
    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 1345-9678 2015 [Refereed][Not invited]
     
    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 1875-3892 2015 [Refereed][Not invited]
     
    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.
  • 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 0168-9002 2014/11 [Refereed][Not invited]
     
    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 2014/05 [Refereed][Not invited]
  • 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 0090-3752 2014/05 [Refereed][Not invited]
     
    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 0090-3752 2014/05 [Refereed][Not invited]
     
    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 0090-3752 2014/05 [Refereed][Not invited]
     
    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 0090-3752 2014/05 [Refereed][Not invited]
     
    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 0090-3752 2014/05 [Refereed][Not invited]
     
    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 0090-3752 2014/05 [Refereed][Not invited]
     
    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 0255-5476 2014/05 [Not refereed][Not invited]
     
    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 2014/02 [Not refereed][Not invited]
  • Hirotaka Sato, Yoshinori Shiota, Yoshikazu Todaka, Takenao Shinohara, Takashi Kamiyama, Masato Ohnuma, Michihiro Furusaka, Yoshiaki Kiyanagi
    Advanced Materials Research 783-786 2109 - 2114 1022-6680 2014/01/01 [Not refereed][Not invited]
     
    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 [Not refereed][Invited]
  • 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 [Not refereed][Not invited]
  • Development of Energy-Selective Neutron Imaging
    Y. Kiyanagi, H. Sato, Y. Shiota, T. Kamiyama, K. Iwase, S. Uno
    JPS Conference Proceedings 1 (014008) 2014 [Refereed][Not invited]
  • 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 [Refereed][Not invited]
  • H. Ishikawa, T. Kamiyama, K. Nittoh, M. Yahagi, Y. Kiyanagi
    Physics Procedia 60 (C) 356 - 362 1875-3892 2014 [Refereed][Not invited]
     
    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 1875-3892 2014 [Refereed][Not invited]
  • Activity of Hokkaido University Neutron Source, HUNS
    M. Furusaka, H. Sato, T. Kamiyama, M. Ohnuma, Y. Kiyanagi
    Physics Procedia 60 167 - 174 1875-3892 2014 [Refereed][Not invited]
  • T. Negishi, T. Shinohara, H. Sato, H. Hasemi, T. Kamiyama, Y. Kiyanagi
    Physics Procedia 60 (C) 91 - 96 1875-3892 2014 [Refereed][Not invited]
     
    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 1875-3892 2014 [Refereed][Not invited]
     
    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 1875-3892 2014 [Refereed][Not invited]
     
    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 0022-3131 2013/12 [Refereed][Not invited]
     
    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 公益社団法人 精密工学会 79 (9) 818 - 821 0912-0289 2013/09/05 [Not refereed][Not invited]
  • Masashi Takada, Kazuaki Kosako, Koji Oishi, Takashi Nakamura, Kouichi Sato, Takashi Kamiyama, Yoshiaki Kiyanagi
    Radiation Protection Dosimetry 153 (3) 369 - 383 0144-8420 2013/03 [Refereed][Not invited]
     
    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 0022-3131 2013/02 [Refereed][Not invited]
     
    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).
  • 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 [Not refereed][Invited]
  • 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 [Not refereed][Invited]
  • 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 [Not refereed][Invited]
  • 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 1875-3892 2013 [Refereed][Not invited]
     
    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.
  • Ueno Hiroki, Kamiyama Takashi, Kiyanagi Yoshiaki
    Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan 2013 (0) 2013 [Not refereed][Not invited]
     
    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 1875-3892 2013 [Refereed][Not invited]
     
    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 1875-3892 2013 [Refereed][Not invited]
     
    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 1875-3892 2013 [Refereed][Not invited]
     
    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 1875-3892 2013 [Refereed][Not invited]
     
    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
    2012/12 [Refereed][Not invited]
  • A. Kimura, T. Fujii, S. Fukutani, K. Furutaka, S. Goko, K.Y. Hara, H. Harada, K. Hirose, J.-I. 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
    Journal of Nuclear Science and Technology 49 (11) 1114  0022-3131 2012/11 [Refereed][Not invited]
  • 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 0022-3131 2012/11 [Refereed][Not invited]
  • 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 0022-3131 2012/07 [Refereed][Not invited]
     
    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 0021-8898 2012/02 [Refereed][Not invited]
     
    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 1095-7863 2012 [Refereed][Not invited]
     
    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 [Not refereed][Not invited]
  • Takashi Kamiyama, Hiroki Ueno, Yoshiaki Kiyanagi
    2012 IEEE NUCLEAR SCIENCE SYMPOSIUM AND MEDICAL IMAGING CONFERENCE RECORD (NSS/MIC) 167 - 170 1082-3654 2012 [Not refereed][Not invited]
     
    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 1875-3892 2012 [Refereed][Not invited]
  • 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 1875-3892 2012 [Refereed][Not invited]
  • Recent progress of pulsed neutron imaging in Japan
    Y. Kiyanagi, H. Sato, K. Iwase, T. Kamiyama
    Physics Procedia 26 219 - 222 1875-3892 2012 [Refereed][Not invited]
  • 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 1875-3892 2012 [Refereed][Not invited]
  • 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 1742-6596 2012 [Refereed][Not invited]
  • 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 0168-9002 2011/12 [Refereed][Not invited]
     
    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 2011/11/25 [Refereed][Not invited]
  • 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 0168-9002 2011/09 [Refereed][Not invited]
     
    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 0168-9002 2011/09 [Refereed][Not invited]
     
    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 1976-8524 2011/08 [Refereed][Invited]
  • 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 1976-8524 2011/08 [Refereed][Invited]
  • 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 1976-8524 2011/08 [Refereed][Invited]
  • 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 1976-8524 2011/08 [Refereed][Invited]
  • 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 1073-5623 2011/08 [Refereed][Invited]
     
    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.
  • Hirotaka Sato, Takashi Kamiyama, Yoshiaki Kiyanagi
    MATERIALS TRANSACTIONS 52 (6) 1294 - 1302 1345-9678 2011/06 [Refereed][Not invited]
     
    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]
  • Yumiko Nakamura, Takashi Kamiyama, Etsuo Akiba
    MATERIALS TRANSACTIONS 52 (4) 591 - 594 1345-9678 2011/04 [Refereed][Not invited]
     
    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]
  • K. Kino, K. Mori, M. Yonemura, S. Torii, M. Kawai, T. Fukunaga, T. Kamiyama
    Journal of the Physical Society of Japan 80 (SUPPL. B) 2011 [Refereed][Not invited]
  • M. Yamashita, K. Mochiki, T. Kamiyama, Y. Kiyanagi
    2011 IEEE NUCLEAR SCIENCE SYMPOSIUM AND MEDICAL IMAGING CONFERENCE (NSS/MIC) 370 - 372 1082-3654 2011 [Refereed][Not invited]
     
    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 [Not refereed][Not invited]
  • 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 [Not refereed][Not invited]
  • 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 0022-3131 2010/12 [Refereed][Not invited]
  • 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 0168-9002 2010/11 [Refereed][Not invited]
     
    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 0168-9002 2010/08 [Refereed]
  • Osamu Takada, Takashi Kamiyama, Yoshiaki Kiyanagi
    JOURNAL OF NUCLEAR MATERIALS 398 (1-3) 129 - 131 0022-3115 2010/03 [Refereed][Not invited]
     
    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 0022-3131 2010/03 [Refereed][Not invited]
     
    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.
  • Y Nakanishi, T Kamiyama, K Ito, M Nakamura, Y Saiga, M Kosaka, Y Uwatoko, M Yoshizawa
    Journal of Physics: Conference Series 200 (1) 012142 - 012142 1742-6588 2010/01/01 
    We performed ultrasonic measurements on high quality single crystals of the Yb-based heavy fermion compounds YbTr2Zn20 (Tr: Co, Rh and Ir) over a temperature range from 200 K to 0.5 K, which seem to be close to a quantum critical point (QCP). A sharp contrast of the temperature dependence of elastic constants was found at low temperature among the three compounds, reflecting the 4f electronic state stemmed from Yb ion. The results indicate that a crystalline electric field (CEF) effect seems to be dominant in the systems YbRh2Zn20 and YbIr2Zn20 at low temperatures. On the other hand, the CEF effect is much less, but an additional effect would be dominant which is most probably ascribable to non Fermi liquid characteristics formed close to the QCP. We discuss briefly each 4f electronic state developed at the low temperatures and physical parameters relating to a renormalized band model in YbTr2Zn20 in the framework of a deformation potential approximation. © 2010 IOP Publishing Ltd.
  • H. Sato, O. Takada, K. Iwase, T. Kamiyama, Y. Kiyanagi
    INTERNATIONAL CONFERENCE ON NEUTRON SCATTERING 2009 251 1742-6588 2010 [Refereed][Not invited]
     
    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 [Not refereed][Not invited]
  • 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 1991-2374 2010 [Not refereed][Not invited]
  • H. Sato, O. Takada, K. Iwase, T. Kamiyama, Y. Kiyanagi
    Journal of Physics: Conference Series 251 (1) 012070  1742-6596 2010 [Refereed][Not invited]
     
    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 - + 0094-243X 2010 [Not refereed][Not invited]
     
    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  2009/10 [Refereed][Not invited]
  • 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 0168-9002 2009/06 [Refereed][Not invited]
     
    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 0168-9002 2009/06 [Refereed][Not invited]
     
    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 0168-9002 2009/06 [Refereed][Not invited]
     
    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.
  • 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 0168-9002 2009/02 [Refereed][Not invited]
     
    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 0168-9002 2009/02 [Refereed][Not invited]
     
    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 0168-9002 2009/02 [Refereed][Not invited]
     
    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 0168-9002 2009/02 [Refereed][Not invited]
     
    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 1095-7863 2009 [Refereed][Not invited]
     
    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 1095-7863 2009 [Refereed][Not invited]
     
    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 1095-7863 2009 [Refereed][Not invited]
     
    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 - + 1082-3654 2009 [Not refereed][Not invited]
     
    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 CONFERENCE RECORD, VOLS 1-5 1194 - + 1082-3654 2009 [Not refereed][Not invited]
     
    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 - + 1082-3654 2009 [Not refereed][Not invited]
     
    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 0916-4731 2008/09/15 [Refereed][Not invited]
  • 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 2008/07 [Not refereed][Not invited]
  • Koji Oishi, Kazuaki Kosako, Takashi Nakamura, Yuki Kobayashi, Issei Sonoki, Koichi Sato, Takashi Kamiyama, Yoshiaki Kiyanagi
    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY 32 - 35 0022-3131 2008/06 [Refereed][Not invited]
     
    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 0022-3131 2008/06 [Refereed][Not invited]
     
    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.
  • KAMIYAMA Takashi
    非破壊検査 = JOURNAL OF THE JAPANESE SOCIETY FOR NON-DESTRUCTIVE INSPECTION 日本非破壊検査協会 57 (6) 273 - 277 0367-5866 2008/06/01 [Not refereed][Not invited]
  • Inelastic neutron scattering in superionic conducting glass Ag2GeSe3
    Y Kawakita, K Shibata, T. Kamiyama, S Takeda
    Journal of Physics: Conference Series 98 022009  1742-6596 2008 [Refereed][Not invited]
  • Y. Kiyanagi, T. Kamiyama, T. Nagata, K. Sakuma, H. Iwasa, F. Hiraga, K. Iwase
    NEUTRON RADIOGRAPHY 363 - 368 2008 [Not refereed][Not invited]
     
    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.
  • T. Kamiyama
    Nippon Netsubussei Shinpojumu Koen Ronbunshu 28 WS003/1 - WS003/2 2007/10 [Not refereed][Not invited]
  • K. Iwase, T. Nagata, K. Sakuma, O. Takada, T. Kamiyama, Y. Kiyanagi
    IEEE Nuclear Science Symposium Conference Record 2 1716 - 1719 1095-7863 2007 [Refereed][Not invited]
     
    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 1095-7863 2007 [Refereed][Not invited]
     
    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 [Not refereed][Not invited]
  • T. Kamiyama, T. Masaki, T. Itami
    KENS REPORT-XV 2003-2006, KEK Pregress Report (2006-4) 169 - 170 2007 [Not refereed][Not invited]
  • Y. Nakamura, T. Kamiyama, E. Akiba
    KENS REPORT-XV 2003-2006, KEK Pregress Report (2006-4) 243 - 244 2007 [Not refereed][Not invited]
  • 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 [Not refereed][Not invited]
  • 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 [Not refereed][Not invited]
  • 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 [Not refereed][Not invited]
  • Y. Kiyanagi, S. Ohnuma, T. Kai, T. Kamiyama, F. Hiraga
    KENS REPORT-XV 2003-2006, KEK Pregress Report (2006-4) 380 - 382 2007 [Not refereed][Not invited]
  • K. Iwase, T. Nagata, K. Sakuma, O. Takada, T. Kamiyama, Y. Kiyanagi
    2007 IEEE NUCLEAR SCIENCE SYMPOSIUM CONFERENCE RECORD, VOLS 1-11 1716 - + 1082-3654 2007 [Not refereed][Not invited]
     
    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 - + 1082-3654 2007 [Not refereed][Not invited]
     
    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).
  • 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 0921-4526 2006/11 [Refereed][Not invited]
     
    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 0921-4526 2006/11 [Refereed][Not invited]
     
    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 0921-4526 2006/11 [Refereed][Not invited]
     
    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.
  • Yoshiaki Kiyanagi, Takashi Kamiyama, Toshiyuki Nagata, Fujio Hiraga
    ADVANCED NONDESTRUCTUVE EVALUATION I, PTS 1 AND 2, PROCEEDINGS 321-323 1663 - 1666 1013-9826 2006 [Refereed][Not invited]
     
    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.
  • T. Mochiku, T. Nakane, H. Kito, H. Takeya, S. Harjo, T. Ishigaki, T. Kamiyama, T. Wada, K. Hirata
    Physica C: Superconductivity and its Applications 426-431 (I) 421 - 425 0921-4534 2005/10/01 
    The yttrium sesquicarbide Y C , which is synthesized at ultra-high pressure of 1.5-5.0 GPa and at high temperature of 1200-1600 °C, exhibits superconductivity around 6-18 K. The superconducting transition temperature, T , is strongly dependent on the synthesizing conditions. We have performed neutron powder diffraction measurements for two samples with different T values of 14.9 K and 9.1 K to investigate the structural difference. The analyses of the diffraction patterns revealed that there was no deficiency and no anomaly in the atomic displacement parameters of the Y and C sites in both samples. We found alternatively the delicate difference of the interatomic distances between the two samples, which have possibility to cause the change of the T value. © 2005 Elsevier B.V. All rights reserved. 2 3 c c c
  • Kiyanagi, Y, Kamiyama, T, Hiraga, F, Matsubayashi, M
    Proceedings of the 9th Symposiumu on JAERI's Reimei Research Program (JAERI-Conf 2005-011) 155 - 160 2005/09 [Not refereed][Not invited]
  • 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 2005/07/01 [Not refereed][Not invited]
  • 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 0168-9002 2005/04 [Refereed][Not invited]
     
    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 0168-9002 2005/04 [Refereed][Not invited]
     
    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 0022-3131 2005/03 [Refereed][Not invited]
     
    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 0018-9499 2005/02 [Refereed][Not invited]
     
    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.
  • 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 [Not refereed][Not invited]
  • 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 1477-2655 2005 [Refereed][Not invited]
     
    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 1477-2655 2005 [Refereed][Not invited]
     
    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 0022-3131 2004/12 [Refereed][Not invited]
     
    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%.
  • 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 0168-9002 2004/08 [Refereed][Not invited]
     
    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 0168-9002 2004/08 [Refereed][Not invited]
     
    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 0168-9002 2004/08 [Refereed][Not invited]
     
    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 0031-9015 2004/07 [Refereed][Not invited]
     
    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 0921-4526 2004/07 [Refereed][Not invited]
     
    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 0921-4526 2004/07 [Refereed][Not invited]
     
    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.
  • Y Kiyanagi, T Kamiyama, H Iwasa, F Hiraga
    ADVANCES IN NONDESTRUCTIVE EVALUATION, PT 1-3 270-273 1371 - 1375 1013-9826 2004 [Refereed][Not invited]
     
    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 1477-2655 2004 [Refereed][Not invited]
     
    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.
  • K Itoh, Y Miyahara, S Orimo, H Fujii, T Kamiyama, T Fukunaga
    JOURNAL OF ALLOYS AND COMPOUNDS 356 608 - 611 0925-8388 2003/08 [Refereed][Not invited]
     
    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 0921-4526 2003/07 [Refereed][Not invited]
     
    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 1098-0121 2003/02 [Refereed][Not invited]
     
    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 [Not refereed][Not invited]
  • T. Kamiyama, T. Omura, H. Iwasa, Y. Kiyanagi, S. Ikeda
    KENS REPORT-XIV 2001-2002, KEK Pregress Report (2003-6) 22 - 23 2003 [Not refereed][Not invited]
  • 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 [Not refereed][Not invited]
  • K. Itoh, T. Kamiyama, T. Fukunaga
    KENS REPORT-XIV 2001-2002, KEK Pregress Report (2003-6) 226 - 227 2003 [Not refereed][Not invited]
  • T. Kamiyama, T. Masaki, T. Itami, Y. Kiyanagi
    KENS REPORT-XIV 2001-2002, KEK Pregress Report (2003-6) 247 - 249 2003 [Not refereed][Not invited]
  • K. Ohoyama, F. Iga, T. Takabatake, S. Itoh, T. Kamiyama
    KENS REPORT-XIV 2001-2002, KEK Pregress Report (2003-6) 258 - 258 2003 [Not refereed][Not invited]
  • K Ohoyama, H Onodera, K Indoh, T. Kamiyama, S. Itoh, Y. Yamaguchi
    KENS REPORT-XIV 2001-2002, KEK Pregress Report (2003-6) 259  2003 [Not refereed][Not invited]
  • 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 1345-7888 2002/12/27 [Not refereed][Not invited]
  • 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 0947-8396 2002/12 [Refereed][Not invited]
     
    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.
  • Y Madokoro, O Yamamuro, H Yamasaki, T Matsuo, Tsukushi, I, T Kamiyama, S Ikeda
    JOURNAL OF CHEMICAL PHYSICS 116 (13) 5673 - 5679 0021-9606 2002/04 [Refereed][Not invited]
     
    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 0921-4526 2002/03 [Refereed][Not invited]
     
    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 [Not refereed][Not invited]
  • 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 [Not refereed][Not invited]
  • 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 [Not refereed][Not invited]
  • H Waki, J Kawamura, T Kamiyama, Y Nakamura
    JOURNAL OF NON-CRYSTALLINE SOLIDS 297 (1) 26 - 30 0022-3093 2002/01 [Refereed][Not invited]
     
    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 0022-3093 2002 [Refereed][Not invited]
     
    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 2001/10/08 [Refereed][Not invited]
     
    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 0031-9015 2001/03 [Refereed][Not invited]
  • 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 0031-9015 2001/03 [Refereed][Not invited]
  • 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 0021-4922 2001/03 [Refereed][Not invited]
     
    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.
  • 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 0921-4526 2000 [Refereed][Not invited]
     
    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 0167-7322 1999/12 [Refereed][Not invited]
     
    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 0167-7322 1999/12 [Not refereed][Not invited]
     
    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 1463-9076 1999/08 [Refereed][Not invited]
     
    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 0022-3697 1999/08 [Refereed][Not invited]
     
    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 0022-3697 1999/08 [Refereed][Not invited]
     
    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 0168-9002 1999/07 [Refereed][Not invited]
     
    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 0167-2738 1999/06 [Refereed][Not invited]
     
    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 0022-3093 1999/03 [Refereed][Not invited]
     
    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 0334-6455 1999/01 [Refereed][Not invited]
     
    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 0956-5000 1998/04 [Not refereed][Not invited]
     
    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 0005-9021 1998/02 [Refereed][Not invited]
     
    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 0956-5000 1998 [Refereed][Not invited]
  • HM Shimizu, H Kato, T Oku, Y Suda, Y Ogawa, H Iwasa, T Kamiyama, Y Kiyanagi, T Wakabayashi
    PHYSICA B 241 172 - 174 0921-4526 1997/12 [Refereed][Not invited]
     
    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 0022-3093 1997/11 [Refereed][Not invited]
     
    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 0005-9021 1997/02 [Refereed][Not invited]
     
    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 0005-9021 1997/02 [Not refereed][Not invited]
     
    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 0022-3093 1997/02 [Refereed][Not invited]
     
    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 0375-9687 1997 [Refereed][Not invited]
     
    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 0375-9687 1997 [Refereed][Not invited]
     
    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 0375-9687 1997 [Not refereed][Not invited]
     
    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 0375-9687 1997 [Not refereed][Not invited]
     
    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 0167-2738 1996/07 [Refereed][Not invited]
     
    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 0022-3093 1995/12 [Refereed][Not invited]
     
    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.
  • T KAMIYAMA, K SHIBATA, K SUZUKI, Y NAKAMURA
    PHYSICA B 213 483 - 485 0921-4526 1995/08 [Refereed][Not invited]
     
    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 0167-2738 1995/07 [Refereed][Not invited]
     
    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 0022-3093 1995 [Not refereed][Not invited]
     
    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 0031-9015 1994/09 [Refereed][Not invited]
     
    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 0022-3093 1992/11 [Refereed][Not invited]
     
    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 0022-3093 1992/11 [Refereed][Not invited]
     
    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 0022-3093 1992/11 [Not refereed][Not invited]
     
    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 0022-3093 1992/11 [Not refereed][Not invited]
     
    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 0031-9015 1992/06 [Refereed][Not invited]
     
    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 0168-9002 1991/11 [Refereed][Not invited]
     
    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 0168-9002 1991/11 [Not refereed][Not invited]
     
    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 0031-9015 1991/10 [Refereed][Not invited]
     
    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 0022-3093 1990/02 [Refereed][Not invited]
  • K SHIBATA, T KAMIYAMA, K SUZUKI, K INOUE
    JOURNAL OF NON-CRYSTALLINE SOLIDS 117 (118) 120 - 123 0022-3093 1990/02 [Not refereed][Not invited]

MISC

  • 中山幸一, 日塔光一, 鬼柳善明, 北垣亮馬, 加美山隆, 佐藤博隆  日本原子力学会春の年会予稿集(CD-ROM)  2023-  2023
  • 中山幸一, 日塔光一, 加美山隆, 佐藤博隆, 北垣亮馬  アイソトープ・放射線研究発表会(Web)  59th-  2022
  • 及川健一, 佐藤博隆, 渡辺賢一, 蘇玉華, 篠原武尚, 甲斐哲也, 鬼柳善明, 加美山隆  量子ビームサイエンスフェスタ(Web)  2020-  2021
  • 阿部雄太, 甲斐哲也, 土川雄介, 松本吉弘, PARKER Joseph D., 篠原武尚, 大石佑治, 加美山隆, 永江勇二, 佐藤一憲  分析化学討論会講演要旨集(Web)  80th-  2020
  • 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
  • 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
  • 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
  • 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
  • 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--  2017/10/16  [Not refereed][Not invited]
     
    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--  2017/10/16  [Not refereed][Not invited]
     
    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
  • 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)  2016/03  [Not refereed][Not invited]
  • 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
  • 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
  • T. Kamiyama, K. Y. Hara, H. Taira, H. Sato  Nuovo Cimento della Societa Italiana di Fisica C  38-  (6)  2015/11/01  [Refereed][Not invited]
     
    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.
  • KINO KOICHI, KAMIYAMA TAKASHI, HIRAGA FUJIO, KIYANAGI YOSHIAKI, HARADA HIDEO, KIMURA ATSUSHI, NAKAMURA SHOJI, IGASHIRA MASAYUKI, HORI JUN'ICHI  日本原子力学会春の年会予稿集(CD-ROM)  2015-  ROMBUNNO.N03  2015/03/05  [Not refereed][Not invited]
  • 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  2015/02  [Not refereed][Not invited]
     
    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.
  • 甲斐哲也, 篠原武尚, 及川健一, 中谷健, 瀬川麻里子, 廣井孝介, SU Y., 林田洋寿, PARKER J. D., 松本吉弘, ZHANG S., 佐藤博隆, 加美山隆, 鬼柳善明  日本中性子科学会年会講演概要集  15th-  2015
  • 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
  • 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  [Not refereed][Not invited]
  • N. Wada, T. Shinohara, H. Sato, H. Hasemi, T. Kamiyama, Y. Kiyanagi  Physics Procedia  69-  427  -435  2015  [Not refereed][Not invited]
     
    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  [Not refereed][Not invited]
     
    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  2015/01/01  [Not refereed][Not invited]
     
    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)  2014/07  [Not refereed][Not invited]
     
    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-  2014/07  [Not refereed][Not invited]
     
    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-  2014/07  [Not refereed][Not invited]
     
    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  2014/06/20  [Not refereed][Not invited]
  • 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  2014/05  [Not refereed][Not invited]
     
    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  2014/03/10  [Not refereed][Not invited]
  • 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  2014/02  [Not refereed][Not invited]
     
    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.
  • IWASHITA HIDENORI, ARAI KAORU, KOTANIGAWA TAKASHI, SATO HIROTAKA, KINO KOICHI, KAMIYAMA TAKASHI, HIRAGA FUJIO, KIYANAGI YOSHIAKI, FURUSAKA MICHIHIRO  日本中性子科学会年会講演概要集  14th-  31  2014  [Not refereed][Not invited]
  • H. Ishikawa, T. Kamiyama, K. Nittoh, M. Yahagi, Y. Kiyanagi  Physics Procedia  60-  (C)  356  -362  2014  [Not refereed][Not invited]
     
    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  [Not refereed][Not invited]
     
    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  [Not refereed][Not invited]
     
    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  [Not refereed][Not invited]
     
    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  [Not refereed][Not invited]
     
    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  [Not refereed][Not invited]
     
    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.
  • 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)  2013/10  [Not refereed][Not invited]
  • 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  2013/03/11  [Not refereed][Not invited]
  • 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  2013/03/11  [Not refereed][Not invited]
  • 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  [Not refereed][Not invited]
  • 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  [Not refereed][Not invited]
  • 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  [Not refereed][Not invited]
     
    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  [Not refereed][Not invited]
     
    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  [Not refereed][Not invited]
     
    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  2012/09/03  [Not refereed][Not invited]
  • 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  2012/09/03  [Not refereed][Not invited]
     
    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  -47  2012/09/03  [Not refereed][Not invited]
     
    J-PARC/MLFの中性子核反応測定装置（ANNRI）のNaI(Tl)スペクトロメータを用いて、飛行時間法によるTc-99の中性子捕獲断面積測定を行った。keV領域での測定を可能にするために測定回路およびデータ収集系の高速化を行い、測定を行った。
  • KINO KOICHI, KAMIYAMA TAKASHI, KIYANAGI YOSHIAKI, HIRAGA FUJIO, FURUSAKA MICHIHIRO, OTA MASAYUKI, OSHIMA MASUMI, KITATANI FUMITO, KIMURA ATSUSHI, KIN TADAHIRO, KOIZUMI MITSUO, GOKO SHINJI, TO YOSUKE, NAKAMURA SHOJI, HARA KAORU, HARADA HIDEO, HIROSE KENTARO, FURUTAKA KAZUYOSHI, IGASHIRA MASAYUKI, KATABUCHI TATSUYA, MIZUMOTO MOTOHARU, HORI JUN'ICHI, TAKAMIYA KOICHI, FUKUTANI SATOSHI, FUJII TOSHIYUKI  日本原子力学会春の年会予稿集(CD-ROM)  2012-  ROMBUNNO.C33  2012/03/02  [Not refereed][Not invited]
  • Y. Kiyanagi, H. Sato, T. Kamiyama, T. Shinohara  5TH EUROPEAN CONFERENCE ON NEUTRON SCATTERING  340-  2012  [Not refereed][Not invited]
     
    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  [Not refereed][Not invited]
     
    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  2011/09/02  [Not refereed][Not invited]
  • 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  2011/09  [Not refereed][Not invited]
     
    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  Hamon  21-  (3)  174  -179  2011/08
  • 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  2011/08  [Not refereed][Not invited]
     
    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  2011/08  [Not refereed][Not invited]
     
    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  2011/08  [Not refereed][Not invited]
     
    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  2011/08  [Not refereed][Not invited]
     
    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  2011/08  [Not refereed][Not invited]
     
    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  2011/08  [Not refereed][Not invited]
     
    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)  2011/06  [Not refereed][Not invited]
  • HORI JUN'ICHI, TAKAMIYA KOICHI, FUKUTANI SATOSHI, FUJII TOSHIYUKI, OTA MASAYUKI, OSHIMA MASUMI, KITATANI FUMITO, KIMURA ATSUSHI, KIN TADAHIRO, KOIZUMI MITSUO, GOKO SHINJI, TO YOSUKE, NAKAMURA SHOJI, HARADA HIDEO, FURUTAKA KAZUYOSHI, IGASHIRA MASAYUKI, KATABUCHI TATSUYA, MIZUMOTO MOTOHARU, KAMIYAMA TAKASHI, KINO KOICHI, KIYANAGI YOSHIAKI, HIRAGA FUJIO, FURUSAKA MICHIHIRO  日本原子力研究開発機構JAEA-Review(Web)  (2011-014)  WEB ONLY 2.4.3  2011/06  [Not refereed][Not invited]
  • KIMURA ATSUSHI, OTA MASAYUKI, OSHIMA MASUMI, KITATANI FUMITO, KIN TADAHIRO, KOIZUMI MITSUO, GOKO SHINJI, TO YOSUKE, NAKAMURA SHOJI, HARADA HIDEO, FURUTAKA KAZUYOSHI, IGASHIRA MASAYUKI, KATABUCHI TATSUYA, MIZUMOTO MOTOHARU, KAMIYAMA TAKASHI, KINO KOICHI, KIYANAGI YOSHIAKI, TAKAMIYA KOICHI, FUKUTANI SATOSHI, FUJII TOSHIYUKI, HORI JUN'ICHI  日本原子力研究開発機構JAEA-Review(Web)  (2011-014)  WEB ONLY 2.4.2  2011/06  [Not refereed][Not invited]
  • 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)  2011/06  [Not refereed][Not invited]
  • 片渕竜也, 水本元治, 井頭政之, 木村敦, 藤暢輔, 中村詔司, 後神進史, 原かおる, 金政浩, 太田雅之, 北谷文人, 古高和禎, 小泉光生, 廣瀬健太郎, 原田秀郎, 大島真澄, 堀順一, 木野幸一, 加美山隆, 平賀富士夫, 古坂道弘, 鬼柳善明  日本原子力学会春の年会予稿集(CD-ROM)  2011-  ROMBUNNO.M16  2011/03/11  [Not refereed][Not invited]
  • Kazuaki Kosako, Koji Oishi, Takashi Nakamura, Masashi Takada, Kouichi Sato, Takashi Kamiyama, Yoshiaki Kiyanagi  JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY  48-  (2)  227  -236  2011/02  [Not refereed][Not invited]
     
    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  2011/01  [Not refereed][Not invited]
     
    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.
  • HORI JUN'ICHI, TAKAMIYA KOICHI, FUKUTANI SATOSHI, FUJII TOSHIYUKI, OTA MASAYUKI, OSHIMA MASUMI, KITATANI FUMITO, KIMURA ATSUSHI, KIN TADAHIRO, KOIZUMI MITSUO, GOKO SHINJI, TO YOSUKE, NAKAMURA SHOJI, HARADA HIDEO, FURUTAKA KAZUYOSHI, IGASHIRA MASAYUKI, KATABUCHI TATSUYA, MIZUMOTO MOTOHARU, KAMIYAMA TAKASHI, KINO KOICHI, KIYANAGI YOSHIAKI, HIRAGA FUJIO, FURUSAKA MICHIHIRO  日本原子力学会秋の大会予稿集(CD-ROM)  2010-  ROMBUNNO.I12  -75  2010/08/27  [Not refereed][Not invited]
     
    J-PARC/MLFビームラインBL04のNNRIにおいて、全立体角Geスペクトロメータを用いて、長寿命核分裂生成核種の一つである93Zrに対する熱領域から10keVのエネルギー領域の中性子捕獲断面積を得た。発表では他の測定データ、評価データとの比較、検討を行う。
  • Yokoo T., Itoh S., Sato T. J., Satoh S., Yano S., Kawana D., Suzuki J., Ueno K., Kuwahara K., Kamiyama T., Iwasa K., Ohoyama K., Kawamura Y., Asami T., Sugiura R.  Meeting abstracts of the Physical Society of Japan  65-  (2)  912  -912  2010/08/18
  • 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  2010/05/21  [Not refereed][Not invited]
  • 片渕竜也, 水本元治, 井頭政之, 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, 堀順一, 木野幸一, 加美山隆, 平賀富士夫, 古坂道弘, 鬼柳善明  日本原子力学会春の年会予稿集(CD-ROM)  2010-  ROMBUNNO.B44  -51  2010/03/09  [Not refereed][Not invited]
     
    J-PARC/MLFビームラインBL04において、NaI検出器を用いてキュリウム同位体を含むマイナーアクチニド核種及び長寿命核分裂生成物の中性子捕獲反応断面積を測定した。
  • kino koichi, Kamiyama Takashi, Kiyanagi Yoshiaki, Hiraga Fujio, Furusaka Michihiro, Ohta Masayuki, Oshima Masumi, Kitatani Fumito, Kimura Atsushi, Kin Tadahiro, Koizumi Mitsuo, Goko Shinji, Toh Yosuke, Nakamura Shoji, Harada Hideo, Furutaka Kazuyoshi, Igashira Masayuki, Katabuchi Tatsuya, Mizumoto Motoharu  Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan  2010s-  47  -47  2010/03/09  [Not refereed][Not invited]
     
    プロジェクト「高強度パルス中性子源を用いた革新的原子炉用核データの研究開発」のうち、中性子捕獲反応の高精度な断面積測定を目的として、J-PARC/MLFに中性子ビームラインを建設した。本発表では、このビームラインの構造を紹介し、得られる中性子ビームの特性について述べる。
  • 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  2010/03/09  [Not refereed][Not invited]
  • 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  2010/03/09  [Not refereed][Not invited]
  • 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  2010/03/09  [Not refereed][Not invited]
  • Itoh S., Yokoo T., Sato T. J., Yano S., Satoh S., Suzuki J., Ueno K., Kuwahara K., Iwasa K., Kamiyama T., Yamamuro O., Ohoyama K., Otomo T., Endoh Y., Akimitsu J., Kuroda S., Sato K., Nasu K., Iwano K., Oohara Y., Yoshizawa H., Kawamura Y., Asami T., Sugiura R.  Meeting abstracts of the Physical Society of Japan  65-  (1)  1015  -1015  2010/03/01
  • 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  2010/01/20  [Not refereed][Not invited]
     
    Accurate nuclear data of long-lived fission products (LLFPs) and minor actinides (MAs) are necessary to estimate the production and transmutation rates of LLFPs and MAs for the advanced reactor systems such as fast reactors and the accelerator driven systems. For the neutron capture cross section measurements, an instrument, Neutron Nucleus Reaction Instrument (NNRI) has been installed. As a major detector system, a large solid-angle Ge spectrometer is used for the prompt γ measurements with a high accuracy. Measurements on MAs and LLFPs are being performed. NNRI will be effectively used for not only MA and LLFP measurements but also generally capture cross section measurements of other elements.
  • SATO Hirotaka, KAMIYAMA Takashi, KIYANAGI Yoshiaki  学術講演会講演論文集  59-  301  -302  2010
  • Experimental investigations for astrophysical photodisintegration reaction rate
    A. Makinaga, K. Kato, T. Kamiyama, K. Yamamoto  AIP Conf. Proc.  1269-  394  2010  [Refereed][Not invited]
  • 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  [Not refereed][Not invited]
  • KIYANAGI Yoshiaki, KAMIYAMA Takashi  非破壊検査 : journal of N.D.I  58-  (12)  533  -537  2009/12/01
  • 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  -58  2009/08/28  [Not refereed][Not invited]
     
    J-PARC/MLFビームラインBL04において、サンプルとしてホウ素を含むホウケイ酸ガラスを用いて、全立体角Geスペクトロメータ設置箇所中心位置における中性子のエネルギー分布を、Ge検出器を用いてTOF法により測定した。
  • 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  -57  2009/08/28  [Not refereed][Not invited]
     
    J-PARC MLF(物質・生命科学実験施設）BL04(ビームライン-04)では、MA及びLLFP核種の中性子捕獲断面積測定を進めている。そのための、中性子・ガンマ線場特性試験の一環としてC6D6検出器等のガンマ線検出器を用いた間接法による中性子場の特性試験及びガンマ線場の測定を実施したのでその結果を報告する。
  • 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  -174  2009/08/28  [Not refereed][Not invited]
     
    J-PARC/MLF BL04にて中性子ビームの実験標的位置における空間分布と エネルギー分布を測定した。また、熱および熱外中性子エネルギー領域の パルスを測定した。これらの結果を中性子源シミュレーションによる結果と 比較した。
  • 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  -60  2009/08/28  [Not refereed][Not invited]
     
    J-PARC/MLFビームラインBL04において、全立体角Geスペクトロメータでの本測定に備えて、Auの中性子捕獲断面積を1台のGe検出器を用いてTOF法により測定し、ダブルパルスの影響や測定可能領域などの評価を実施した。
  • 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  -881  2009/08/18  [Not refereed][Not invited]
  • Katabuchi Tatsuya, Mizumoto Motoharu, Igashira Masayuki, Kimura Atsushi, Toh Yosuke, Nakamura Shoji, Goko Shinji, Kin Tadahiro, Ohta Masayuki, Kitatani Fumito, Furutaka Kazuyoshi, Koizumi Mitsuo, Harada Hideo, Oshima Masumi, Hori Jun-ichi, Kino Koichi, Kamiyama Takashi, Hiraga Fujio, Furusaka Michihiro, Kiyanagi Yoshiaki  Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan  2009-  (0)  59  -59  2009  [Not refereed][Not invited]
     
    J-PARC MLF（物質・生命科学実験施設）ビームライン4（BL04）において、MAおよびLLFP核種の中性子捕獲断面積の測定を計画している。今回、NaI(Tl)検出器を用いて、中性子捕獲反応実験のための予備実験を行った。その結果について報告する。
  • 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  [Not refereed][Not invited]
  • 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  [Not refereed][Not invited]
  • 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  2008/08/21  [Not refereed][Not invited]
     
    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-  2008/02/01  [Not refereed][Not invited]
     
    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  2007/10/18  [Not refereed][Not invited]
  • 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  2007/09/07  [Not refereed][Not invited]
     
    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  2007/03/06  [Not refereed][Not invited]
     
    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。
  • Shinohara T., Iwashita H., Suzuki J., Oku T., Kamiyama T., Iwasa H., Hiraga F., Kiyanagi Y., Sato K., Shimizu H. M.  Meeting abstracts of the Physical Society of Japan  62-  (1)  949  -949  2007/02/28
  • Kai Tetsuya, Kamiyama Takashi*, Hiraga Fujio*, Kato Takashi, Kiyanagi Yoshiaki*  JAEA-Research 2006-090  35  2007/02  
    Spatial distributions of neutron intensities were measured based on the pinhole camera principle to confirm a peculiar one for a para-hydrogen (H$_2$) moderator by neutron transportation calculations. Para- H$_2$ and ortho-rich-H$_2$ (ortho/para ratio was 60:40-70:30) were utilized. The results are consistent with the calculations. Position dependences of energy spectra were measured for further discussions. Both moderators exhibit the intensity enhancements at the fringe part between 15 and 100 meV. Below 15 meV, the para-H$_2$ moderator exhibits higher intensity at the fringe part, while a intensity decrease was recognized at the fringe part of the ortho-rich-H$_2$ one. The reasons for the peculiar distribution are due to the characteristics of para- H$_2$: the effective slowing-down reaction for thermal neutrons and the higher transmission rate for cold neutrons. The present result is one of the basis confirming the reliability of design calculation used in the J-PARC project.
  • 鬼柳 善明, 岩瀬 謙二, 加美山 隆  加速器  4-  (2)  123  -130  2007
  • 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  [Not refereed][Not invited]
  • 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  [Not refereed][Not invited]
  • KAWAI MASAYOSHI, NIITA KOJI, MAEKAWA FUJIO, OIKAWA KEN'ICHI, KAJIMOTO RYOICHI, KAMIYAMA TAKASHI, SUZUYA KENTARO, TAMURA MASAYA, NAKAJIMA KENJI, HARADA MASAHIDE  日本原子力学会秋の大会予稿集(CD-ROM)  2005-  C24  2005/08/12  [Not refereed][Not invited]
  • 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
  • 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  [Not refereed][Not invited]
  • Y Nakamura, T Ishigaki, T Kamiyama, E Akiba  JOURNAL OF ALLOYS AND COMPOUNDS  384-  (1-2)  195  -202  2004/12  [Not refereed][Not invited]
     
    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.
  • Kamiyama T, Hosokawa S, Baron A Q R, Tsutsui S, Yoshida K, Kiyanagi Y, Yamaguchi T  Meeting abstracts of the Physical Society of Japan  59-  (2)  296  -296  2004/08/25
  • Omura T., Itoh K., Moriyoshi C., Ikeda S., Kamiyama T., Parker S. F.  Meeting abstracts of the Physical Society of Japan  58-  (2)  845  -845  2003/08/15
  • 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  [Not refereed][Not invited]
  • Masaki Tadahiko, Aoki Hirokatsu, Munejiri Shuuji, Itami Toshio, Kamiyama Takashi, Ishii Yoshinobu  Meeting abstracts of the Physical Society of Japan  56-  (2)  650  -650  2001/09/03
  • Ohoyama K., Onodere H., Indou K., Kaneko K., Yamauchi H., IShimoto K., Kamiyama T., Yamaguchi Y.  Meeting abstracts of the Physical Society of Japan  56-  (2)  399  -399  2001/09/03
  • Ishimoto K., Konno J., Ohoyama K., Ohmori T., Kaneko K., Onodera H., Yamaguchi Y., Hirota K., Kamiyama T.  Meeting abstracts of the Physical Society of Japan  56-  (2)  484  -484  2001/09/03
  • Ishimoto K., Konno J., Ohoyama K., Ohmori T., Keneko K., Onodera H., Yamaguchi Y., Hirota K., Kamiyama K.  Meeting abstracts of the Physical Society of Japan  56-  (1)  500  -500  2001/03/09
  • Masaki Tadahiko, Munejiri Shuji, Ishii Yoshinobu, Kamiyama Takashi, Itami Toshio  Meeting abstracts of the Physical Society of Japan  56-  (1)  714  -714  2001/03/09
  • Sasaki K, Koike G, Hirota T, Iwasa K, Kamiyama T, Kiyanagi Y, Oku T, Adati T, Shimizu H, Hino M, Tazaki S, Ebisawa T, Ino T, Furusaka M, Suzuki J  Meeting abstracts of the Physical Society of Japan  56-  (1)  889  -889  2001/03/09  [Not refereed][Not invited]
  • Ishimoto K., Ohmori T., Kaneko K., Ohoyama K., Onodera H., Yamaguchi Y., Hirota K., Kamiyama T.  Meeting abstracts of the Physical Society of Japan  55-  (2)  385  -385  2000/09/10
  • Madokoro Y., Yamamuro O., Yamasaki H., Matsuo T., Tsukushi I., Kokubun H., Kamiyama T., Ikeda S.  Meeting abstracts of the Physical Society of Japan  55-  (1)  303  -303  2000/03/10
  • Oku T, Shimizu H.M, Kato H, Otani C, Sato H, Ikeda I, Hirota T, Iwasa H, Kamiyama T, Kiyanagi Y, Wakabayashi T, Ino T, Suzuki J  Meeting abstracts of the Physical Society of Japan  54-  (2)  425  -425  1999/09/03  [Not refereed][Not invited]
  • Kaneko K., Kamiyama T., Kiyanagi Y., Kawamura J., Sakuma T., Ikeda S.  Meeting abstracts of the Physical Society of Japan  54-  (1)  215  -215  1999/03/15
  • Oku T, Shimiz H.M, Kato H, Otani C, Sato H, Nakagawa H, Suda Y, Ogawa Y, Iwasa H, Kamiyama T, Kiyanagi Y, Wakabayashi T  Meeting abstracts of the Physical Society of Japan  54-  (1)  365  -365  1999/03/15  [Not refereed][Not invited]
  • 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  1998/12/01  [Not refereed][Not invited]
     
    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.
  • KANEKO K., KAMIYAMA T., KIYANAGI Y., IKEDA S., SAKUMA T.  Meeting abstracts of the Physical Society of Japan  53-  (2)  251  -251  1998/09/05
  • SHIMIZU Hirohiko M  Meeting abstracts of the Physical Society of Japan  53-  (2)  414  -414  1998/09/05  [Not refereed][Not invited]
  • SHIBATA K, KAMIYAMA T, SUZUKI K  Meeting Abstracts of the Physical Society of Japan  53-  (0)  707  -707  1998  [Not refereed][Not invited]
  • 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  1996/11  [Not refereed][Not invited]
  • KAMIYAMA Takashi, SHIBATA Kaoru, SUZUKI Kenji  まてりあ : 日本金属学会会報  34-  (1)  36  -45  1995/01/20  [Not refereed][Not invited]
  • Arakawa Kouichi, Kawamura Junichi, Kamiyama Takasi, Nakamura Yosio  Abstracts of the meeting of the Physical Society of Japan. Sectional meeting  1994-  (2)  198  -198  1994/08/16
  • 加美山 隆, 柴田 薫, 鈴木 謙爾  物性研究  62-  (2)  p318  -320  1994/05  [Not refereed][Not invited]
     
    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。
  • Tsuzuki T, Yao M, Kawakita Y, Noguchi T, Endo H, Shibata K, Kamiyama T, Misawa M, Suzuki K  Meeting Abstracts of the Physical Society of Japan  49-  (0)  264  -264  1994  [Not refereed][Not invited]
  • 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  1993/09  [Not refereed][Not invited]
  • 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  1990/11  [Not refereed][Not invited]
  • Shibata Kaoru, Kamiyama Takashi, Suzuki Kenji, Inoue Kazuhiko  Meeting Abstracts of the Physical Society of Japan  44-  (0)  170  -170  1989  [Not refereed][Not invited]
  • 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  1988/09/16

Books etc

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

Presentations

Association Memberships

  • 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   

Works

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

Research Projects

  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2017/04 -2021/03 
    Author : Kamiyama Takashi
     
    In this study, we have applied the neutron resonance absorption spectroscopy (N-RAS) to a rotating neutron resonance absorber simulating a working machine, and developed the temperature analysis with a standard curve constructed by the aid of particle transport simulation (N-RAS/PTS method). We found that by the method the temperature of the rotating object can be measured non-destructively, remotely and without contact, with an accuracy of several kelvin from room temperature to 600 K. For N-RAS/PTS measurement does not require any restriction on the neutron beam irradiation field, and synchronization between the accelerator operation and sample rotation. The N-RAS/PTS method can be used to prepare a standard curve in advance as long as the sample structure is known, which allows for efficient use of measurement time.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2011/04 -2016/03 
    Author : KIYANAGI Yoshiaki, KAMIYAMA Takashi, FURUSAKA Michihiro, UNO Shoji, MOCHIKI Koichi, SHINOHARA Takenao, KINO Kohichi, SATO Hirotaka, HASEMI Hiroyuki, KAI Tetsuya, SHIOTA Yoshinori, IWASE Kenji, YASHIRO Wataru, OTAKE Yoshie
     
    We improved a pulsed neutron imaging method using energy analysis and promoted its applications. First, we improved a data analysis code and applied it to analyze martensite phase of quenched steels, a Japanese sword and a new material, and could develop a method to measure hardness non-destructively. CT methods were examined. A hydrogen storage material could be also studied. An imaging method of small angle scattering was developed. Quantitative analysis of a resonance absorption spectrum became feasible. Magnetic field was measured with good accuracy and the method was applied to a magnetic foil. Furthermore, we succeeded in phase contrast measurements using pulsed neutrons firstly in the world. A high counting rate detector and a camera type detector with short channel width of time of flight measurement were successfully manufactured.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2012/04 -2015/03 
    Author : KAMIYAMA Takashi
     
    Neutron resonance absorption spectroscopy (N-RAS) with a pulsed neutron source can distinguish the dynamics of individual nuclides by their resonance peak widths That can identify the motions of a particular nuclide with its resonance energies, and analyze the dynamics of nuclides from the Doppler broadening of the resonance peaks due to their thermal motion. We applied this technique to the nondestructive thermometry of the object inside. In this study, we applied prompt gamma-ray type N-RAS, but it is inefficient for imaging because it needs spatial beam scan. If we put multiple nuclides each location, it can measure the temperature of the desired location at the same time. We measured the resonance absorption spectrum of a heated sample which was composed with multiple nuclides. The analyzed nuclides were Ta-181, Ag-109 and Sm-147 in the same sample object. Each nuclide indicates a good consistency. The difference between analyzed and sample temperature is under 5 K in each nuclide.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2010/04 -2015/03 
    Author : IGASHIRA Masayuki, KATABUCHI Tatsuya, HARADA Hideo, NAKAMURA Shoji, IWAMOTO Nobuyuki, KIMURA Atsushi, HORI Jun-ichi, KIYANAGI Yoshiaki, KAMIYAMA Takashi, KINO Koichi, HIRAGA Fujio, YASHIMA Hiroshi
     
    The objective of the present study was to contribute to the improvement of the accuracy of database for neutron capture reaction cross sections used for the technological development of nuclear transmutation of long-lived nuclear wastes. First, the precise measurements of capture cross sections of long-lived nuclear wastes, i.e. Zr-93, Tc-99, Pd-107, I-129, Np-237, Am-241, Am-243, Cm-244, Cm-246, and related stable isotopes were performed. Then, theoretical analysis of the measured results was systematically performed, and the capture reaction mechanism of long-lived nuclear wastes was elucidated. Finally, reliable calculated capture cross sections for all long-lived nuclear wastes and in the whole neutron energy region were supplied.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2009 -2011 
    Author : TOMIOKA Satoshi, NISHIYAMA Shusuke, KAMIYAMA Takashi, SAKASHITA Hiroto
     
    In measurement of distribution of gas temperature or concentration of liquid, the correct measurement is difficult, since the condition of the object to be measured is changed due to the sensor (e.g thermo couple) itself. In this study, we propose a phase tomography that is a coupling method of optical interferometer and computed tomography that is three dimensional non-destructive measurement. Experimental measurement of three dimensional gas temperature distribution agree with theoretical distribution qualitatively.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2009 -2011 
    Author : KAMIYAMA Takashi, KIYANAGI Yoshiaki
     
    Neutron resonance absorption spectroscopy (N-RAS) using a pulsed neutron source can be applied to time-of-flight (TOF) radiography 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 the neutron and gamma-ray (X-ray) radiography, which utilize the gamma-rays (or X-rays) at the same time as the neutron pulse is emitted, to improve the spatial resolution of the quantitative reconstruction of the neutron tomogram. And, we applied the neutron image intensifier with the shutter function to the Bragg edge radiography of material distribution.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2008 -2010 
    Author : KOZAKI Tamotsu, TOMIOKA Satoshi, NISIYAMA Shusuke, KAMIYAMA Takashi, SASAKI Takayuki, KOZAI Naofumi
     
    As a fundamental study for the safety assessment of the geological disposal of high-level radioactive waste, the mesoscopic structures of the expected barrier materials (bentonite and sedimentary rock) were characterized by X-ray diffraction analysis, X-ray micro CT observation and μ-PIXE analysis. The hydraulic conductivity, diffusivity, and distribution coefficient of radioactive tracers were determined as indicators in order to relate the barrier performance to the mesoscopic structures.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2008 -2010 
    Author : KIYANAGI Yoshiaki, FURUSAKA Michihiro, KAMIYAMA Takashi, MOCHIKI Kohichi, HIRAGA Fujio, KANEKO Junichi, IWASE Kenji, HARADA Masahide, OOI Motoki, SATO Setso, SAGEHASHI Hidenori
     
    It has been clarified that texture in metals reflects the neutron transmission cross section and the world's first analysis code for deducing quantitative information of the texture, crystallite size and strain has been developed. By using this code texture and crystallite size of a welded iron were investigated, and also texture, crystallite size and strain of iron during in-situ tensile test were successfully imaged. Furthermore, a camera system applicable to a pulsed neutron source has been developed.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2005 -2007 
    Author : KANEKO Junichi, FURUSAKA Michihiro, FUJITA Fumiyuki, KIYANAGI Yoshiaki, KAMIYAMA Takashi, OTAKE Yoshie
     
    Changes in neutron intensity and diffraction angle form a vibrating quartz single crystal were investigated by a 2D neutron detector and time-of-flight method. A X-cut quartz single crystal in size of 3mm×120mm×14mm was used in an experiment. Quartz single crystal has polarization according to a X-axis, thus, perpendicular cut to this axis, I.e., X-cut has the largest displacement. Bias voltage of 40 V was applied to aluminum electrodes fabricated on the quartz crystal, and it was moved in the characteristic vibration frequency of 22.7 kHz. Maximum displacement of c.a. 5μm was observed using a microscope. A neutron diffraction experiment was carried out on the ULS (Ultra Small angle neutron scattering) system in JRR-3M; neutron beam of wavelength of 4.7 angstrom was used. A combination of a ZnS:Li scintillator and a position sensitive photo multiplier was used as a neutron detector. Neutron diffraction patterns were obtained with a vibrating quartz single crystal in 22.7 kHz; change of neutron diffraction patterns according to vibration period. Neutron intensity had two strong components. Velocity of 4.7 angstrom neutrons are c.a. 840 m/s, thus they move 1.8 cm in 44μs, I.e., a half of the vibration period. By change of 1.8 cm in position of the detector, neutron intensity was changed according to phase shifting in pi. Experimental results were compared with theoretical estimation. In the case of displacement caused by the Doppler effect was larger than that caused by deformation, experimental results of time dependence of diffracted neutrons' intensity were suit for a theoretical result.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2005 -2007 
    Author : KIYANAGI Yoshiaki, KAMIYAMA Takashi, KANEKO Jyunichi, TOMIOKA Satoshi, TAKENAKA Nobuyuki, FURUSAKA Michihiro
     
    Spectroscopic neutron radiography using a pulsed neutron can give structural information of materials since it has neutron cross section data at each pixel. Especially, at low energy region of the cross section Bragg edges appear which reflect the crystal structure of the materials. The shift of the Bragg position gives strain of the crystal. We performed the experiment on the iron sample which would have strain due to bending. We could clearly observe the strain position and amount of the strain. It was found that the strain appeared on specific crystal planes. It is also indicated that the total neutron cross section around the Bragg edge depended on the grain size of the crystalitte and showed that the cross section decreased proportional to the grain size by a model experiment. Furthermore, the crystal structural change around the welded position of the SS-Iron sample and Iron-Iron sample. The crystal structure change had similar tendency in both sample. Naturally, far from the weld position the cross section showed the typical feature of Bragg edges of iron and SS, as approaching the weld position the edge became sharper, and at weld position the edge had a sharp edge implying the isotropic distribution of the crystallittes. On the other hand, at high energy we can utilize the resonance absorption to get image of elements or nuclei. We performed transmission measurement of the heavy material to get CT image, and it is suggested that the method was also useful for imaging the element distribution and also that we may use this to measure the temperature by analyzing the resonance peak. We developed the sensor of the imaging detector based on Gd composite. We succeeded in making a test detector and also obtained images by using the neutron beam. As mentioned above, the spectroscopic neutron imaging using the pulsed neutron sources are very powerful tool to investigate micro structure of the materials, such as strain, crystallite size, distribution of crystallite and so on. Now, the operation of the big proton accelerator neutron source is just about to take place. We will get much higher quality data by using such high intensity sources and also get much detailed information about the sample materials. Therefore, we are now on the stage to develop the method further to promote the industrial applications.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2004 -2005 
    Author : KAMIYAMA Takashi
     
    Neutron resonance absorption spectroscopy (N-RAS) associated with computer tomography was applied to nuclide distribution analysis and thermometry for homogeneous and inhomogeneous bulk objects. This new method provides 2-dimensional distributions of nuclide positions or temperatures on the planar cross-section of a bulk object as information from remote-sensing and non-destructive analysis. The study was carried out on the neutron resonance absorption spectrometer DOG installed at KENS at the High Energy Accelerator Research Organization (KEK) in Japan. Measurements were undertaken by recording the spectra for each sample object's direction and neutron slit position to include all the spatial information inside the object. With the spectrum for the all combinations of the slit positions and the rotation angle, the CT calculations were carried out using the 2-dimensional Fourier transformation or maximum entropy methods. The nuclide positions reconstructed by CT agree with the actual object structure, and the reconstructed temperature distribution is close to the estimated real distribution. To confirm the validity of this method we have undertaken simulation calculations. This simulation was carried out as the object had the same estimated temperature distributions and the statistical conditions as the experiment. 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 ; thus being potentially useful for various industrial developments.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2002 -2004 
    Author : KIYANAGI Yoshiaki, KAMIYAMA Takashi, HIRAGA Fujio, SAWAMURA Teruko, KANEKO Junichi, FURUSAKA Michihiro
     
    Methane hydrate has been expected as a cold neutron moderator material giving higher intensity over wide energy range. We have performed experimental studies mainly. We measured neutron inelastic scattering at ISIS in UK to know the neutron cross-section characteristics. The methane molecule in methane hydrate seemed to rotate freely since the rotational energy level was 1.1meV which is almost same as the energy level of free rotation of methane. We could deduce the translational modes in the small and large ice cages. The ice vibrational mode and librational mode in methane hydrate were almost similar to those of ice In although there existed small distortion. These data suggested that methane hydrate cross section can be simulated linear combination of cross sections of both materials. As a moderator the effect of methane is important but the content of methane is not so high in methane hydrate. So, we performed moderator experiments to observe the neutronic performance of methane hydrate. We studied a coupled and a decoupled moderators. Methane and hydrogen moderator data were also obtained fro the comparison. In the case of the coupled moderator, the shape of the energy spectrum of methane hydrate was similar to that of ice, the peak energy of methane hydrate moderator was little bit higher than those of other materials of methane and hydrogen. Spectral intensity around the cold neutron region was much lower than other materials. However, around the thermal neutron region the intensity was higher. In the case of the decoupled moderator the spectral intensity was approaching that of hydrogen moderator but much lower than methane. The pulse width of emission time was much wider than other moderators. Therefore, it will be concluded that the methane hydrate moderator does not have so good characteristics as a cold moderator and can give higher intensity at higher energy region.
  • 日本学術振興会：科学研究費助成事業
    Date (from‐to) : 2000 -2001 
    Author : 加美山 隆
     
    中性子共鳴吸収分光法(N__-eutron R__-esonance A__-bsorption S__-pectroscopy, N-RAS)は、中性子共鳴吸収即発γ線分析法と飛行時間法を組み合わせた、我国の中性子実験グループにより提案・開発された全く新しい概念に基づく分光法である。本研究は、この新しい分光法でイオン伝導体中のAg原子の運動を追跡し、材料研究に対する本手法の有用性と応用性を明らかにする事を目的とした。平成13年度は、イオン伝導体中のAgについて測定を系統的に進めると共に、並行してこの実験手法の実験誤差要因について系統的に検討を行った。イオン伝導体としてはAgIの他、Ag3SI及びAg3Brを試料とし、キャリアイオンAgの運動状態と骨格を形成するIの運動状態について個別に情報を取り出し、相転移点を含む温度範囲で測定した。この結果、(1)骨格を形成するIの実効温度は、AgIとAg3SIの双方において各転移を含む測定温度領域の全体にわたって運動変化の傾向に変化は見られない、(2)キャリアであるAgイオンの運動は、Ag3SIやAg3SBrのγ→β転移のように骨格の変化を伴わないものではその傾向に変化は現れないが、骨格の変化を伴うAgIのβ→α転移ではAgイオンの運動に変化が現れる、ということがわかった。即ち、骨格を形成する陰イオンの作る環境がキャリアの運動に非常に大きく影響を及ぼすものと考えられる。また、N-RAS測定において問題となる誤差要因については、主としてスペクトルのフィッティングに影響を及ぼす原子の断面積の大きさについて検討した。この結果、試料を10%程度の吸収条件に調整すれば実効温度の誤差を0.5%程度に押さえられることがわかった。以上、本研究により、N-RASが実用材料の研究に応用が可能で有用な情報を与えること、試料に必要な調整条件を明らかにすることができた。
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 1999 -2001 
    Author : KIYANAGI Yoshiaki, NARITA Hasakuni, HIRAGA Fujio, KAMIYAMA Takashi, WATANABE Noboru, FURUSAKA Michihiro
     
    High power spallation neutron sources with a power of MW class are now under construction in Japan and the USA, and in the Europe a higher power spallation neutron source with a power of 5 MW is now under planning. The neutron production part (target/moderator/reflector system : TMRS) of the facility is most important since it determines the performance of the facility. In this project, we studied the TMRS and got the results described below. We could introduce a new simulation code by collaborating with Los Alamos, and it has been a very powerful tool for optimization. We succeeded to increase effectively the intensity from a hydrogen moderator by introducing the heavy water pre-moderator. As a new type moderator we examined HD and CH3D moderators and got information about the neutron characteristics on the partially deuterated material. We measured the neutronic performance of LANSCE at Los Alamos, the second highest power spallation source in the world. We could check the validity of the simulation and get information on ortho-para transition at high radiation field. We have obtained very useful information on the design of the new spallation neutron sources in Japan, which is also useful for other future spallation sources.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 1998 -2001 
    Author : YOSHIKI Hajime, EBISU Takeo
     
    In 1998, further works on the cryostat Mark 3001, which had been developed with the Grant-in-Aid for Scientific Research on Priority Area (Ultracold Neutrons) till 1996, have newly started. For a possible experimental site, ILL and PSI were investigated as the candidates. As the result, the collaboration with University of Sussex, the main research institute of edm measurement up till now, and RNL was launched. Two young researchers visited Japan in this period. The cooling of the superconducting solenoid has started from 1999/6, and the persisitent current mode has been achieved on 1999/7/25. It was confirmed that necessary magnetic field of 10 mG was generated in the superstable state. In the meantime, the collaboration with Sussex group was pushed forward. Consequently a joint proposal by Kure Univ. and Univ. of Sussex of an experiment "CryoEDM" was made on 1999/8/30 to the ILL steering committee. This proposal was officially approved by the organizing committee later in mid-October. In the meantime Mombusho executed an inspection of the scene on 1999/9/20 in Japan. From mid-December tests were carried out upon the cryostat (Cooling Tower II), and the liquid helium temperature attained a record breaking temperature, 0.48K, on 2000/2/4. On 2000/3/15 a confirmative document of the proposal made August of the previous year was sent to ILL. The committee allocated 40 days beam time to the project (11.22-12.7, 3.15-4.10). In order to comply with this developing situation, the whole members in the project, thirteen altogether have met at ILL. From the summer of 2000, shipping the experimental equipments began. The improved Cooling Tower I was completed on June 29, and together with other hundreds of pieces of equipment were sent from Japan on 2000/7/10. I went to Europe on 2000/8/ 7-21, 9/7-23 and 11/9-12/15 to help the construction of the beam H53 for PF1. In 2001/3, a great number of UCNs far more than expected for foreign researchers were produced, showing the high efficiency and the superiority of the superthermal method to the world. It was found however the beam intensity of H53 was 1/60 of the specification made by ILL. These results were published at an international UCN workshop held at Pushkin, Russia, in June. From January to March of 2002, UCN production rate vs incident cold neutron wavelength has been measured very accurately by inserting an elaborate velocity selector in the beam. This measurement showed that the multiphonon UCN production did exist but only about one tenth of the single phonon production rate. The saturated UCN density was 8/cm^3 with 0.7/cm^3/s production rate. Both are record breaking numbers (PhysLetterA308(03)p67) and with the advent of improved cold neutron beam the final UCN density will be 4000/cm^3, which will be good enough to reach even 10^-28 e.cm level in several years. The 10^-26 e.cm level we proposed as a target level at the outset of this project has been cleared by the Sussex group working at the normal temperatures (PRL82(1999 )904). Ebisu of Univ. of Kobe continued his studies on the detection of slow neutrons by means of superconducting granules (Sb) and made a progress confirming such detection mechanism as he had anticipated is taking place clearly by using a stronger neutron source. This result can be applied to further developments of detetors not only for neutrons but also for neutral particles such as dark matter.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 1999 -2000 
    Author : KIYANAGI Yoshiaki, HIRAGA Fujio, KAMIYAMA Takashi, SAWAMURA Sadashi, KAWABATA Yuji, FURUSAKA Michihiro
     
    Narrow neutron beam with high intensity will open wide variety of neutron utilization fields. We studied two methods to focusing the neutoron beam. One is neutron mzgnetic lens by using 6 pole magnetic field, and the other is multi-capilary fiber. About magnetic lens, first we measured the neutron intensity through the lens and found that there exist factor 2 difference in focusing intensity between simulation and experiment. We tried to explain the reason of We found that there existed some distortion in the lens system due to strong force of high magnetic field and that this would cause gaps between magnet components. These gaps reduced the intensity. Succeedingly, we studied a function of the mfagnetic lens to forcus and pararell the neutron beasm, in which system two lenses are arranged in a series. For such a system we need neutron spin flipper to change orientation of the neutron spin between the two lenses. We observed the evidence of the neutron focusing and defocusing by using the spin flipper. This suggest the system works as neutron focusing and pararelling device. Second, we studied the wavelength dependence of neutron transmission through a multi-capirally fiber in order to know the effectiveness for utilization of white beam. A three dimensional simulation code was developed to analyze the transport characteristics. Transmission intensity depend on the radius of the capirally and also on the curvature of the fiber setting. The transmission of longer wavelength neutrons increases with the radius. Simulation indicated that the wavelength dependence of transmission could not be explained by ideal condition of the fiber and we needed to introduce distorsion in the fiber, such as waving. These data are very useful to make devices using multi-capiraly fiber.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 1998 -1999 
    Author : NAKAMURA Yoshio, TAMURA Kozaburo, KAWAMURA Junichi, ITAMI Toshio, INUI Masanori, KAMIYAMA Takashi
     
    1). Mercury, a representative liquid metal, shows a metal-nonmetal transition in the supercritical region, and selenium, a representative liquid semiconductor, shows a transition from semiconductor to metal, and then to insulator. It is very important to investigate the relation between these physical properties and the atomic arrangement, density fluctuation or cluster formation in these materials. In the present study we have obtained some interesting results on the short-, medium-, and long-range structure of supercritical mercury and selenium, using the facilities of ESRF of Grenoble and Spring-8 of Nishiharima as strong X-ray sources. 2). In superionic conductor glasses the dielectric relaxation associated with the glass transition cannot be observed due to large ionic conductivity. In the high frequency region, however, the contribution of ionic conduction is relatively small and it is expected to observe this dielectric relaxation. In this year, measurements of dielectric relaxation for AgI-AgィイD22ィエD2O-BィイD22ィエD2OィイD23ィエD2, AgI-AgPOィイD23ィエD2 have been made at the Bourgogne University up to the glass transition temperature over the frequency range from 1MHZ to 1GHz. From the results obtained we discuss quantitatively considering the concentration fluctuation of oxides and halides in the glasses. We have also made some preliminary measurements on bromine NMR in an aqueous solution of ZnBrィイD22ィエD2 over a temperature range from room temperature to above 100℃. 3). The alkali metal-mercury alloy systems show interesting electronic properties such as minimum of thermoelectric power. It is strongly suggested that the medium range chemical order due to the charge transfer between the constituent atoms is related to these properties. In this year we have measured the X-ray absorption (EXAFS and XANES) for the liquid Rb-Hg system, at ESRF of Grenoble. The absorption at the L-edge for Hg and at the K-edge for Rb was measured as a function of alloy composition. From these results we have found that the change of the stucture around the Hg and Rb atoms is strongly correlated with the electronic properties of this system.
  • 日本学術振興会：科学研究費助成事業
    Date (from‐to) : 1998 -1998 
    Author : 加美山 隆
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 1995 -1997 
    Author : NAKAMURA Yoshio, KAMIYAMA Takashi, KAWAMURA Junichi
     
    The results of the present project are summarized as follows : 1.Metal-nonmetal systems : We have studied the electric conductivity and Cs-133 NMR in the Cs-ammonia-methylamine system and correlated the observed concentration flucutuation and the metal-nonmetal (MNM) transition of the system. Low field EPR measuremts at 200 MHz were carried out for the Na-ammonia system to show the local metallization prior to the bulk MNM transition. Precipitation of Ag and Bi nano-particles in borate glasses was investigated and the size dependence has been found for their physical properties such as plasmon absorption or melting temperature. The NM transition in the Tl-Ge-Te system has been correlated to the thermodynamic properties obtained from EMF measuremnts. 2.Organic-inorganic mixed superionic conductors : The electrical conductivity of AgI-tetraalkylammonium iodide mixed glasses has been studied as a function of volume fraction of AgI,which shows a percolation transition from the superionic to insulator states. Microscopic investigations were also made with NMR,EXAFS,neutron and X-ray small angle scattering. 3.Ionic salt-molecular liquid systems : The viscosity of the LiNO_3-glycerol system increases with salt concentration, while the electrical conductivity decreases. Similar measurements have been made for the LiCl-water system. Network structures composed of solvated lithium ions and solventmolecules have been suggtested. From these results it is concluded that in liquids and glasses composed of chemically different substances the local in homogeneities due to phase separation or complex formation determine electrical properities of the bulk systems.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 1995 -1996 
    Author : NAKAMURA Yosio, SAKAGUCHI Yoshifumi, KAWAMURA Junichi, KAMIYAMA Takashi, INUI Masanori, TAMURA Kozaburo, DENIS Raoux, ROGER Argoud, YVONNE Soldo, JEAN-FRANCOIS Jal, JOSETTE Duppuy-Philon, OLIBIER Geaymond, PIERRE-OLIVIER Maurin, ETIENNE Pernot, JEAN-LOUIS Hazemann
     
    The main results of the present research project are summarized as follows. 1) It is known that liquid Se sohws a semiconductor-metal transition on expansion above the liquid-gas critical point (1615ﾟC,385 bar). The Hiroshima group has carried out energy dispersive-X-ray diffraction, small angle X-ray diffraction, and XAFS experiments in order to investigate the mechanism of this transition from the change of atomic arrangements. They have succeeded in XAFS and XD measurements for the first time on liquid and supercritical Se, by use of intensive X-rays source of ESRF at Grenoble with cooperation of French scientists. It has been found that the two-fold coordinated structure still remains in the metallic region and that the bond length decreases at the semiconductor to metal transition. They proposed a model in which a planer zigzag structure of Se plays an important role in the metallization of the system. 2) Concentrated aqueous solutions of LiC1 are very viscous and easily vitrified. In order to investigate dynamics of water molecules and ions, the Hokkaido group performed the neutron scattering and NMR (relaxation and diffusion coefficient) measurements with the French group from Lyon. In particular, they have succeeded to measure the diffusion coefficients and the NMR relaxation times of water in supercooled concentrated LiCl solutions. The results are compared with the results from Muon spectroscopy already obtained by the French group. 3) While mutual visiting of Japanese and French scientists to perform the present research project were successfully achieved, we have tried to extend the project in future, by use of high pressure-high temperature NMR (Hokkaido University) and high pressure-high temperature XRD (Hiroshima University). The training of French young researchers in Sapporo and Hiroshima was very useful and promising for further development of each group participated in this project.
  • 日本学術振興会：科学研究費助成事業
    Date (from‐to) : 1995 -1995 
    Author : 加美山 隆
     
    通常の共軸2重回転粘度測定法を改良し、内筒の回転によって試料にかかるトルクの大きさを、トルクをかけるモーターにフィードバックすることによって、非常に幅の広い粘度域を測定可能にし、且つ試料にかかるトルク型を低くする定トルク型の粘度計を作製して、実際にネットワーク構造を持つ液体系の測定に応用する研究を行った。 定トルク型の粘度計は内筒を回転させるモーターと内筒の間を細いワイヤーで結び、ワイヤーのねじり強さを適当に変えることで試料に与えるトルクを決定するため、単一の装置で幅広い粘度領域の測定に対応できるようになった。ワイヤーのねじれ角度は光学式エンコーダーを用いて検出するので非常に高い精度で角度の検出が可能である。これにより測定される最少のねじれ角度を制御用計算機でステッピングモーターにフィードバックし、モーターをそのねじれ角度分回転させることにより、非常に低いトルクで粘度の測定が可能となった。 本装置では、当初粘度標準液を幾つか測定して広い粘度範囲で装置のキャリブレーションを行った後、液体中において静電的な結合により比較的弱いネットワークを形成していると考えられるグリセロール-硝酸リチウム系の測定を行った。粘度標準液を使用した測定結果では、各温度において本装置の測定精度は±1%程度であった。グリセロール-硝酸リチウム系の測定では組成・温度を変化させて行った結果、この系がストロングガラス形成系とフラジャイルガラス形成系の中間に位置し、塩濃度を高めるとよりフラジャイルな性質を示すことが明らかとなった。
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 1992 -1994 
    Author : IKEDA Hironobu, INABA A., STEIGENBERGER U., KAMIYAMA T., WATANABE N., FURUSAKA M., IKEDA S., MISAWA M., ASANO H., SHIBATA K., KOHGI M., YAMADA K., ENDOH Y., MATSUO T., ARAI M., KAKURAI K., KAJI K., KANAYA T., ITOH S.
     
    The Japan-UK Collaboration in Neutron Scattering is a consequence of an Agreement between the Japanese National Laboratory for High Energy Physics (KEK) and UK Science and Engineering Research Council (SERC) established in 1986 to promote scientific collaboration and interchange between Japanese and UK scientists in the field of pulsed neutron scattering It has resulted in the construction of the MARI spectrometer at the ISIS Facility and has given formal accsess to the scientific program at ISIS for Japanese scientists. The scientific achievements of the Japan-UK Collaboration in the year of 1994 are as follows. Highlights of the work in the area of high-Tc superconductors and related materials include the measurements on MARI of the dynamical structure factor S (Q,epsilon) of examples of the high-Tc cuprates, La_<1.85>Sr_<0.15>CuO_4. These experiments revealed anomalous high-energy magnetic fluctuations extending up to 300 meV which are quite different from YBa_2Cu_3O_7. Quantum effects on one-dimensional Heisenberg antiferromagnet with S=3/2, CsVCl_3, were investigated. Using MARI they were able to determine the full dispersion of the magnetic excitations, with zone boundary energies of 75 meV.One of the key results of these measurements is that there is nogap at the zone center as was found in the integer spin case. Hydrogen plays a fundamental role in the properties of many solid materials. Neutrons can gain information on its position in the structure and its dynamical behavior. Quantum theory is necessary to account for the latter, and enables the scattering intensity to be interpreted in terms of the potential well in which the hydrogen atom resides. This may be accomplished by measuring the shape of the hydrogen wave function. The role of the hydrogen bond in the ferroelectric phase transition was studied in KHCO_3, and the shape of the crystal potential was studied by measuring S (Q,epsilon).
  • 日本学術振興会：科学研究費助成事業
    Date (from‐to) : 1993 -1993 
    Author : 加美山 隆
     
    本研究は、中性子準弾性散乱によりアルカリリン酸塩融体内のPO_4四面体の揺動運動を測定することでPO_4ネットワークの形成過程を調べることを目的としたものである。試料としてはNa_2OとP_2O_5の1:1の混合系を用いた。理想的にはこの混合比でリン酸塩ガラスはそのネットワークが分岐点を有しない1本のPO_4重合体からなるはずであり、溶融〜ガラス状態の変化においてどのような大きさのPO_4重合体からネットワークが形成されていくのか興味深い。 試料はリン酸二水素アンモニウム(NH_4H_2PO_4)と炭酸ナトリウム(Na_2CO_3)の混合物を真空中で溶融・分解させて作成した。この試料は300℃以下でも固化せず非常に安定して過冷却する。作成試料は粉末にして、中性子非弾性散乱用円筒型石英セルに真空封入した。中性子散乱の測定には高エネルギー物理学研究所・ブ-スター利用施設中性子散乱実験室に設置されているLAM-40型中性子準弾性散乱分光器を使用した。この装置はエネルギー移行omega=-4〜10meV、弾性散乱位置において分解能が200mueVで運動量移行O=0.2〜2.5A^<-1>の範囲の動的構造因子S(O,omega)を測定することができる。試料の取り付けでは抵抗線加熱型真空炉内でアダプターを介して石英セルを支え、それにより試料の昇温を行った。実験の測定では真空炉の能力及びマシンタイムの都合上、融点上の600℃、過冷状態の400℃、ガラス状態り室温の3点のみで行い、さらに各温度に保持した石英セルのバックグランドと標準試料のバナジウムの測定も行った。測定データの処理は東北大学大型計算機センターで稼動中のプログラムを用いてバックグランド、カウンター効率、吸収、エネルギー窓幅等の補正を行い、試料の動的構造因子S(O,omega)を得た。 その結果では、過冷状態と600℃の動的構造因子S(O,omega)のスペクトルの概形はガラス状態のそれとほぼ変わらず裾に分子内揺動運動モードを表す幅広い準弾性散乱スペクトルが見られない。このことはNa_2O-P_2O_5のリン酸塩ガラスでは融点より高い温度においてもPO_4四面体を骨格としたネットワークがほぼ完全に形成されていることを示している。一方、スペクトルの高さはガラス状態に向け温度が下がるほど高くなるという変化を示し、このガラスの融体はネットワーク鎖の揺動運動による流動性で特徴づけられているものと考えられる。
  • 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

Industrial Property Rights

  • 特表WO2021002469:核反応検出装置及び方法並びにプログラム【時刻】    2021/01/07
    岩下秀徳, 舩津玄太郎, 古坂道弘, 加美山隆, 佐藤博隆, 鬼柳善明
  • 特表WO2021002470:核反応検出装置及び方法並びにプログラム【位置】    2021/01/07
    岩下秀徳, 舩津玄太郎, 古坂道弘, 加美山隆, 佐藤博隆, 鬼柳善明
  • 加美山 隆, 佐藤 博隆, 吉澤 章博, 三和田 靖彦, 石井 博行, 松本 清市  国立大学法人北海道大学, トヨタ自動車株式会社  201803018099880289
  • 加美山 隆, 佐藤 博隆, 吉澤 章博, 三和田 靖彦, 石井 博行, 松本 清市  国立大学法人北海道大学, トヨタ自動車株式会社  201603010868948457

Copyright © MEDIA FUSION Co.,Ltd. All rights reserved.