Researcher Database

Yoshiharu Hirabayashi
Information Initiative Center Digital Contents
Associate Professor

Researcher Profile and Settings

Affiliation

  • Information Initiative Center Digital Contents

Job Title

  • Associate Professor

Degree

  • (BLANK)

J-Global ID

Research Areas

  • Natural sciences / Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics

Association Memberships

  • e-Learning教育学会   日本物理学会   

Research Activities

Published Papers

  • 1. Production of a 4He hypernucleus in the 4He(π,K) reactions reexamined
    HIRABAYASHI Yoshiharu
    Physical Revidew C 100 (2) 024605-1 - 024605-11 2019/08 [Refereed][Not invited]
  • Toru Harada, Ryotaro Honda, Yoshiharu Hirabayashi
    Physical Revidew C 97 (2) 024601-1 - 024601-13 2018/02 [Refereed][Not invited]
  • S. Ohkubo, Y. Hirabayashi, A. A. Ogloblin
    PHYSICAL REVIEW C 96 (2) 024607-1 - 024607-6 2469-9985 2017/08 [Refereed][Not invited]
     
    The existence of a supernumerary nuclear rainbow in inelastic scattering is reported. This is done by studying inelastic O-16 scattering from C-12, exciting the 2(+) (4.44 MeV) state of C-12 and elastic scattering at the incident energies in the range 124-200 MeV, using the coupled channels method. An extended double folding potential is used. This is derived from realistic wave functions for C-12 and O-16 calculated with a microscopic a cluster model and a finite-range density-dependent nucleon-nucleon force. Excitations to the 2(+) (4.44 MeV), 3(-)(9.64 MeV), and 4(+) (14.08 MeV) states of C-12, and the 3(-)(6.13 MeV) and 2(+) (6.92 MeV) states of O-16 are included in the coupled channels calculations. The emergence of the supernumerary bow is understood by the properties of both the Luneburg-lens-like potential in the internal region and diffuse attraction in the outer region. The existence of a supernumerary rainbow for inelastic scattering in addition to the existence of a dynamically created secondary rainbow and a dynamically refracted primary rainbow for elastic scattering, which are not observed in meteorological rainbows, further deepens the understanding of nuclear rainbows.
  • Toru Harada, Yoshiharu Hirabayashi
    PHYSICAL REVIEW C 95 (4) 044610-1 - 044610-10 2469-9985 2017/04 [Refereed][Not invited]
     
    We study phenomenologically the production of the neutron-rich hypernucleus H-6(Lambda) in the Li-6(pi(-), K+) reaction at 1.2 GeV/c, using a distorted-wave impulse approximation in a one-step mechanism, pi(-) p -> K+ Sigma(-) via Sigma(-) doorways caused by Sigma(-) p <-> Lambda n coupling. The production cross section of H-6(Lambda)(1(exc.)(+)) is evaluated by a coupled (H-5- Lambda) + (He-5-Sigma(-)) model with a spreading potential, in comparison with the data of the missing mass spectrum at the J-PARC E10 experiment. The result indicates that the Sigma(-) mixing probabilities in H-6(Lambda)(1(exc.)(+)) are P Sigma- < similar to 0.2% both for s(Sigma) state and for p(Sigma) state in order to reproduce no significant peak in the Lambda production data, so that the cross section of H-6(Lambda) is less than on the order of 0.4 nb/sr. The sensitivity of the Sigma Lambda coupling and Lambda potentials to the near-Lambda-threshold spectrum is discussed. The shape and magnitude of the spectrum provide valuable information on the Sigma Lambda coupling in the production mechanism and also the nuclear structure of H-6(Lambda)(1(exc.)(+)).
  • S. Ohkubo, Y. Hirabayashi
    PHYSICAL REVIEW C 94 (3) 034601-1 - 034601-5 2469-9985 2016/09 [Refereed][Not invited]
     
    We present for the first time evidence for the existence of a dynamically refracted primary bow for Be-9 + O-16 scattering. This is demonstrated through the use of coupled channel calculations with an extended double folding potential derived from the density-dependent effective two-body force and precise microscopic cluster wave functions for Be-9. The calculations reproduce the experimental Airy structure in Be-9 + O-16 scattering well. It is found that coupling of a weakly bound 9Be nucleus to excited states plays the role of a booster lens, dynamically enhancing the refraction over the static refraction due to the Luneburg lens mean field potential between the ground states of Be-9 and O-16.
  • D. Ichinkhorloo, M. Aikawa, S. Chiba, Y. Hirabayashi, K. Kato
    PHYSICAL REVIEW C 93 (6) 064612-1 - 064612-7 2469-9985 2016/06 [Refereed][Not invited]
     
    We study the integrated elastic and inelastic scattering cross sections together with their angular distributions of n + Li-6,Li-7 using n+ (alpha + d) and n+ (alpha + t) cluster models, respectively, and the continuum-discretized coupled-channel framework. The microscopic single-folding potential is used for the neutron energies from 1 to 24 MeV. The calculated elastic and inelastic scattering cross sections are in good agreement with experimental and evaluated data for the observed incident energies.
  • S. Ohkubo, Y. Hirabayashi, A. A. Ogloblin
    PHYSICAL REVIEW C 92 (5) 051601-1 - 051601-5 0556-2813 2015/11 [Refereed][Not invited]
     
    The existence of a secondary bow is confirmed for C-13 + C-12 nuclear rainbow scattering in addition to the O-16 + C-12 system. This is found by studying the experimental angular distribution of C-13 + C-12 scattering at the incident C-13 energy E-L = 250 MeV with an extended double-folding (EDF) model that describes all the diagonal and off-diagonal coupling potentials derived from the microscopic wave functions for C-12 using a density-dependent nucleon-nucleon force. The Airy minimum at theta approximate to 70 degrees, which is not reproduced by a conventional folding potential, is revealed to be a secondary bow generated dynamically by a coupling to the excited state 2(+) (4.44 MeV) of C-12. The essential importance of the quadruple Y2 term (reorientation term) of potential of the excited state 2(+) of C-12 for the emergence of a secondary bow is found. The mechanism of the secondary bow is intuitively explained by showing how the trajectories are refracted dynamically into the classically forbidden angular region beyond the rainbow angle of the primary rainbow.
  • S. Ohkubo, Y. Hirabayashi
    PHYSICAL REVIEW C 92 (2) 024624-1 - 024624-5 2469-9985 2015/08 [Refereed][Not invited]
     
    The Airy structure in O-16 + C-14 rainbow scattering is studied with an extended double-folding (EDF) model that describes all the diagonal and off-diagonal coupling potentials derived from the microscopic realistic wave functions for O-16 by using a density-dependent nucleon-nucleon force. The experimental angular distributions at E-L = 132, 281, and 382.2 MeV are well reproduced by the calculations. By studying the energy evolution of the Airy structure, the Airy minimum around theta = 76 degrees in the angular distribution at E-L = 132 MeV is assigned as the second-order Airy minimum A2 in contrast to the recent literature which assigns it as the third order A3. The Airy minima in the 90 degrees excitation function is investigated in comparison with well-known O-16 + O-16 and C-12 + C-12 systems. Evolution of the Airy structure into the molecular resonances with the O-16 + C-14 cluster structure in the low-energy region around E-c.m. = 30 MeV is discussed. It is predicted theoretically for the first time for a non-4N O-16 + C-14 system that Airy elephants in the 90 degrees excitation function are present.
  • R. S. Mackintosh, Y. Hirabayashi, S. Ohkubo
    PHYSICAL REVIEW C 91 (2) 024616-1 - 024616-8 0556-2813 2015/02 [Refereed][Not invited]
     
    Background: It was shown recently that an anomaly in the elastic scattering of O-16 on C-12 at around 300 MeV is resolved by including within the scattering model the inelastic excitation of specific collective excitations of both nuclei, leading to a secondary rainbow. There is very little systematic knowledge concerning the contribution of collective excitations to the interaction between nuclei, particularly in the overlap region when neither interacting nuclei are light nuclei. Purpose: Our goals are to study the dynamic polarization potential (DPP) generated by channel coupling that has been experimentally validated for a case (O-16 on C-12 at around 300 MeV) where scattering is sensitive to the nuclear potential over a wide radial range; to exhibit evidence of the nonlocality due to collective coupling; to validate, or otherwise invalidate, the representation of the DPP by uniform renormalizing folding models or global potentials. Methods: S-matrix to potential, S-L -> V (r), inversion yields local potentials that reproduce the elastic channel S matrix of coupled channel calculations. Subtracting the elastic channel uncoupled potential yields a local L-independent representation of the DPP. The dependence of the DPP on the nature of the coupled states and other parameters can be studied. Results: Local DPPs were found due to the excitation of C-12 and the combined excitation of O-16 and C-12. The radial forms were different for the two cases, but each were very different from a uniform renormalization of the potential. The full coupling led to a 10% increase in the volume integral of the real potential. Evidence for the nonlocality of the underlying formal DPP and for the effect of direct coupling between the collective states is presented. Conclusions: The local DPP generating the secondary rainbow has been identified. In general, DPPs have forms that depend on the nature of the specific excitations generating them, but, as in this case, they cannot be represented by a uniform renormalization of a global model or folding model potential. The method employed herein is a useful tool for further exploration of the contribution of collective excitations to internuclear potentials, concerning which there is still remarkably little general information.
  • Tom Harada, Yoshiharu Hirabayashi
    NUCLEAR PHYSICS A 934 8 - 17 0375-9474 2015/02 [Refereed][Not invited]
     
    We theoretically investigate an inclusive pi(-) spectrum of a He-3(K- pi(-)) reaction at 870 MeV/c in a distorted-wave impulse approximation using the continuum discretized coupled channels (CDCC) method, in order to well describe the pp Lambda continuum states above the p + p + Lambda breakup threshold. We calculate the continuum ppA states applying the multichannel Green's function with a microscopic 2N - Lambda folding-model potential constructed by the CDCC wavefunctions. The results show that the calculated spectra reproduce available experimental data, and that the pp continuum states lying in higher energies are needed to fully describe these spectra, depending on the momentum transfer in the (K- pi(-)) reaction. It is shown that this calculation provides the ability of describing three-body ppA breakup systems for the (K- pi(-)) spectra. (C) 2014 Elsevier B.V. All rights reserved.
  • Toru Harada, Yoshiharu Hirabayashi
    PHYSICS LETTERS B 740 312 - 316 0370-2693 2015/01 [Refereed][Not invited]
     
    We theoretically investigate a possible existence of a p-wave He-4(Sigma) resonant state with J(pi) =1(-), T similar or equal to 1/2 above the Sigma threshold, using a coupled (3N - A) + (3N-Sigma) model with a spreading potential. We calculate inclusive and Sigma-A conversion pi(-) spectra in a He-4(K-, pi(-)) reaction at 1.5 GeV/c, theta(lab) = 4-12 degrees by the Green's function method in a distorted-wave impulse approximation. The pole position for the p-wave Sigma resonant state in He-4(Sigma) is determined on the Riemann sheets in the complex E plane. The result shows that a peak of the He-4(Sigma) resonant state is clearly obtained in the conversion spectra above the X threshold, and that the angular distributions of these spectra enable extraction of the contribution of the resonant state from the pi(-) spectra. Effects of the Sigma-nucleus potential and the interference between A and X on the spectra are also discussed. (C) 2014 The Authors. Published by Elsevier B.V.
  • S. Ohkubo, Y. Hirabayashi, A. A. Ogloblin, Yu. A. Gloukhov, A. S. Dem'yanova, W. H. Trzaska
    PHYSICAL REVIEW C 90 (6) 064617-1 - 064617-6 2469-9985 2014/12 [Refereed][Not invited]
     
    Inelastic O-16 + C-12 rainbow scattering to the 2(+) (4.44 MeV) state of C-12 was measured at the incident energies, E-L = 170, 181, 200, 260, and 281 MeV. A systematic analysis of the experimental angular distributions was performed using the coupled-channels method with an extended double folding potential derived from realistic wave functions for C-12 and O-16 calculated with a microscopic alpha cluster model and a finite-range density-dependent nucleon-nucleon force. The coupled-channels analysis of the measured inelastic-scattering data shows consistently some Airy-like structure in the inelastic-scattering cross sections for the first 2(+) state of C-12, which is somewhat obscured and still not clearly visible in the measured data. The Airy minimum was identified from the analysis and the systematic energy evolution of the Airy structure was studied. The Airy minimum in inelastic scattering is found to be shifted backward compared with that in elastic scattering.
  • S. Ohkubo, Y. Hirabayashi
    PHYSICAL REVIEW C 89 (6) 061601-1 - 061601-5 2469-9985 2014/06 [Not refereed][Not invited]
     
    We present evidence for the nuclear ripples superimposed on the Airy structure of the nuclear rainbow, which is similar to the meteorological rainbow. The mechanism of the nuclear ripples is also similar to that of the meteorological rainbow, which is caused by the interference between the externally reflective waves and refractive waves. The nuclear ripple structure was confirmed by analyzing the elastic angular distribution in O-16 + C-12 rainbow scattering at E-L = 115.9 MeV using the coupled channels method by taking account of coupling to the excited states of C-12 and O-16 with a double folding model derived from a density-dependent effective nucleon-nucleon force with realistic wave functions for C-12 and O-16. The coupling to the excited states plays the role of creating the external reflection.
  • S. Ohkubo, Y. Hirabayashi
    PHYSICAL REVIEW C 89 (5) 051601(R)-1 - 051601(R)-5 2469-9985 2014/05 [Refereed][Not invited]
     
    Rainbows are generally considered to be caused by static refraction and reflection. A primary and a secondary rainbow appear due to refraction and internal reflection in a raindrop as explained by Newton. The quantum nuclear rainbow, which is generated by refraction in the nucleus droplet, only has a "primary" rainbow. Here we show for the first time evidence for the existence of a secondary nuclear rainbow generated dynamically by coupling to an excited state without internal reflection. This has been demonstrated for experimental O-16 + C-12 scattering using the coupled channel method with an extended double folding potential derived from microscopic realistic wave functions for C-12 and O-16.
  • Toru Harada, Yoshiharu Hirabayashi
    PHYSICAL REVIEW C 89 (5) 054603-1 - 054603-16 0556-2813 2014/05 [Refereed][Not invited]
     
    We theoretically demonstrate the inclusive and semiexclusive spectra in the He-3( K-, pi(+)) reactions at 600 MeV/c (4 degrees) within a distorted-wave impulse approximation, using a coupled (2N - A) + (2N - Sigma) model with a spreading potential. We present the possible existence of the Sigma NN quasibound state with J(pi) = 1/2(+), T similar or equal to 1 near the Sigma threshold, predicted by a 2N - Y folding-model potential derived from YN g-matrices. The result shows that a signal of the 3(Sigma) He quasibound state is clearly confirmed near the Sigma threshold in the pi(-) spectrum, whereas a peak of the 3(Sigma)n n quasibound state is rather reduced in the pi(+) spectrum owing to the interference effects caused by the (3)S1- (1)S0 admixture in the NN pair. The mechanism of Sigma production for these spectra and charge symmetry breaking effects are also discussed.
  • Toru Harada, Yoshiharu Hirabayashi, Atsushi Umeya
    NUCLEAR PHYSICS A 914 85 - 90 0375-9474 2013/09 [Refereed][Not invited]
     
    We theoretically study production of a Lambda Lambda hypernucleus C-16(Lambda Lambda) in a (K-, K+) reaction on an O-16 target at pK(-) = 1.8 GeV/c, within a distorted-wave impulse approximation. The calculated spectrum provides promising peaks of the Lambda Lambda bound and excited states of C-16(Lambda Lambda) in a one-step mechanism K- p -> K+ Xi(-) via Xi(-) doorways caused by a Xi(-) p -> Lambda Lambda coupling, rather than in a two-step mechanism as K- p -> pi(0) Lambda followed by pi(0) p -> K+ Lambda. The cross sections and Xi(-) admixture probabilities are discussed in terms of the Xi N-Lambda Lambda coupling in the nucleus. (C) 2013 Elsevier B.V. All rights reserved.
  • Toru Harada, Yoshiharu Hirabayashi
    Few-Body Systems 54 (7-10) 1205 - 1209 0177-7963 2013/08 [Refereed][Not invited]
     
    We theoretically demonstrate the inclusive and semiexclusive spectra in the 3He (K -, π ∓) reactions at 600 MeV/c (4°) within a distorted-wave impulse approximation, using a coupled (2N - Λ) + (2N - Σ) model with a spreading potential. It is shown that a signal of a 3ΣHe quasibound state is clearly observed near the Σ threshold in the π - spectrum, whereas a peak of a 3Σn quasibound state is relatively reduced in the π + spectrum. The mechanism of Σ production for these spectra is discussed. © 2013 Springer-Verlag Wien.
  • Y. Hirabayashi, S. Ohkubo
    PHYSICAL REVIEW C 88 (1) 014314-1 - 014314-6 0556-2813 2013/07 [Refereed][Not invited]
     
    The Airy structure of the nuclear rainbow and prerainbow in inelastic and elastic alpha + O-16 scattering is studied with the coupled channel method using a folding potential derived from the microscopic wave functions of O-16. The theoretical calculations reproduce the characteristic energy evolution of the Airy minimum of the experimental angular distributions. The energy levels with alpha-cluster structure in Ne-20 are reproduced well using the potentials determined from the analysis of scattering. It is shown that the emergence of the K = 0(3)(+) alpha-cluster band with core excitation at 7.19 MeV in Ne-20 is intimately related to the emergence of the prerainbow and rainbow in inelastic scattering to the O-16(0(2)(+)). It is found that the alpha-cluster states with core excitation, the prerainbow and the rainbow in inelastic scattering are understood in a unified way as well as in the case of elastic scattering.
  • Sh Hamada, Y. Hirabayashi, N. Burtebayev, S. Ohkubo
    Physical Review C - Nuclear Physics 87 (2) 024311  1089-490X 2013/02/13 [Refereed][Not invited]
     
    Angular distributions for elastic and inelastic scattering of 3He from 12C were measured at energies 50.5 and 60 MeV. The Airy minimum of the prerainbow scattering was clearly observed in the angular distributions for the 02+ (7.65 MeV) state of 12C (Hoyle state). The experimental results were analyzed with a coupled channels method with double folding potentials derived from the microscopic wave functions for the ground 01+, 2+ (4.44 MeV), 3 - (9.64 MeV), and 02+ states. The analysis supports the view that the Hoyle state is a three α particle condensate with a large radius of dilute matter distribution. © 2013 American Physical Society.
  • D. Ichinkhorloo, Y. Hirabayashi, K. Kato, M. Aikawa, T. Matsumoto, S. Chiba
    PHYSICAL REVIEW C 86 (6) 064604-1 - 064604-7 2469-9985 2012/12 [Refereed][Not invited]
     
    We study Li-7(n, n')Li-7* reactions by using the continuum-discretized coupled-channels (CDCC) method with the complex Jeukenne-Lejeune-Mahaux effective nucleon-nucleon interaction. In this study, the Li-7 nucleus is described by an alpha + t cluster model. The calculated elastic cross sections for incident energies between 11.5 and 24.0 MeV show good agreements with experimental data. Furthermore, we calculate the neutron spectra of Li-7 ground and excited breakup states measured at selected angular points for incident energies of 11.5 and 18.0 MeV. The results reproduce the observed data systematically. DOI: 10.1103/PhysRevC.86.064604
  • Toru Harada, Yoshiharu Hirabayashi
    PHYSICAL REVIEW C 86 (1) 014606  0556-2813 2012/07 [Refereed][Not invited]
     
    We theoretically investigate the elastic scattering of 50-MeV Sigma(-) hyperons from Si-28 and Pb-208 in order to clarify the radial distribution of Sigma-nucleus (optical) potentials. The angular distributions of differential cross sections are calculated using several potentials that can explain experimental data of the Sigma(-) atomic x-ray and (pi(-), K+) reaction spectra simultaneously. The magnitude and oscillation pattern of the angular distributions are understood by the use of nearside/farside decompositions of their scattering amplitudes. It is shown that the resultant angular distributions provide a clue to discriminating among the radial distributions of the potentials that have a repulsion inside the nuclear surface and an attraction outside the nucleus with a sizable absorption.
  • T. Matsumoto, D. Ichinkhorloo, Y. Hirabayashi, K. Katō, S. Chiba
    Physical Review C 83 (6) 064611  0556-2813 2011/06 [Refereed][Not invited]
  • S. Ohkubo, Y. Hirabayashi
    INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS 20 (4) 880 - 884 0218-3013 2011/04 [Refereed][Not invited]
     
    The existence of a rotational band with the alpha+C-12(0(2)(+)) cluster structure is demonstrated near the four-alpha threshold of O-16 in agreement with experiment. A drastic reduction of the moment of the inertia of the 0(+) state at 15.1 MeV suggests that it is superfluid with four alpha-particle condensation. The rotational excitation of the condensate in O-16 is discussed.
  • Dagvadorj Ichinkhorloo, Takuma Matsumoto, Yoshiharu Hirabayashi, Kiyoshi Kato, Satoshi Chiba
    Journal of Nuclear Science and Technology 48 (11) 1357 - 1360 0022-3131 2011 [Refereed][Not invited]
     
    The n + 6Li reactions are important not only from the basic interest but also from the application point of view. We study 6Li breakup reactions at incident neutron energies of 11.5, 14.1, and 18.0MeV applying a d + α cluster model to 6Li and using the continuum-discretized coupled-channels (CDCC) approach. At the present energies, our calculation well reproduces the experimental data. This successful result indicates the reliability of the CDCC approach based on the cluster model to the nuclear reaction evaluation of light nuclear reactions. © 2011 Atomic Energy Society of Japan.
  • D. Ichinkhorloo, T. Matsumoto, Y. Hirabayashi, K. Kato, S. Chiba
    SECOND INTERNATIONAL ULAANBAATAR CONFERENCE ON NUCLEAR PHYSICS AND APPLICATIONS 1342 102 - 105 0094-243X 2011 [Refereed][Not invited]
     
    The few-body, especially three-body, problem is still an open (and therefore interesting) subject in nuclear physics, and has been studied intensively by various theoretical frameworks. The n + Li-6 reactions are important not only from the basic interest but also from the application point of view. The Li-6 nucleus is well described by the cluster model such as a + d and a + p + n. Therefore, it is necessary for us to treat the n + Li-6 system with a + d + n and a + p + n + n models. In this work, we study the n + Li-6 inelastic reactions applying the a + d cluster model to Li-6 and using the continuum-discretized coupled-channels approach. We have included elastic and inelastic data at 14.1 MeV neutron incident energies in the calculation. At the present energy, our calculation gives almost good agreement with experimental data.
  • Toru Harada, Yoshiharu Hirabayashi, Atsushi Umeya
    PHYSICS LETTERS B 690 (4) 363 - 368 0370-2693 2010/06 [Refereed][Not invited]
     
    We examine theoretically production of doubly strange hypernuclei, (Xi)-C-16 and C-16(Lambda Lambda), in double-charge exchange O-16(K-, K+) reactions using a distorted-wave impulse approximation. The inclusive K+ spectrum at the incident momentum p(K)- = 1.8 GeV/c and scattering angle theta(lab) = 0 degrees is estimated in a one-step mechanism, K(-)p -> K+Xi(-) via Xi(-) doorways caused by a Xi(-)p-Lambda Lambda coupling. The calculated spectrum in the Xi(-) bound region indicates that the integrated cross sections are on the order of 7-12 nb/sr for significant 1(-) excited states with C-14(0(+) ,2(+)) circle times s(Lambda)p(Lambda) configurations in C-16(Lambda Lambda) via the doorway states of the spin-stretched N-15(1/2(-), 3/2(-)) circle times s(Xi-) in (Xi)-C-16 due to a high momentum transfer q(Xi)- similar or equal to 400 MeV/c. The Xi(-) admixture probabilities of these states are on the order of 5-9%. However, populations of the 0(+) ground state with C-14(0(+)) circle times s(Lambda)(2), and the 2(+) excited state with C-14(2(+)) circle times s(Lambda)(2) are very small. The sensitivity of the spectrum on the Xi N-Lambda Lambda coupling strength enables us to extract the nature of Xi N-Lambda Lambda dynamics in nuclei, and the nuclear (K-, K+) reaction can extend our knowledge of the S = -2 world. (C) 2010 Elsevier B.V. All rights reserved.
  • S. Ohkubo, Y. Hirabayashi
    PHYSICS LETTERS B 684 (2-3) 127 - 131 0370-2693 2010/02 [Refereed][Not invited]
     
    The existence of a rotational hand with the alpha + C-12(0(2)(+)) Cluster structure, in which three alpha particles in C-12(0(2)(+)) are locally condensed, is demonstrated near 2 the four-alpha threshold of O-16 in agreement with experiment. This is achieved by Studying structure and scattering for the alpha + C-12(0(2)(+)) system in a unified way. A drastic reduction (quenching) of the moment of the inertia of the 0(+) state at 15.1 MeV just above the four-alpha threshold in O-16 suggests that it Could be a candidate for the superfluid state in alpha-particle condensation. (C) 2010 Elsevier B.V. All rights reserved.
  • Toru Harada, Yoshiharu Hirabayashi
    NUCLEAR PHYSICS A 829 (1-2) 100 - 125 0375-9474 2009/10 [Refereed][Not invited]
     
    We study a production of Coulomb-assisted Sigma(-)-nucleus bound states by nuclear (K-, pi(+)) reactions within a distorted-wave impulse approximation, so as to examine several types of the Sigma-nucleus potentials that are consistent with the available Sigma(-) atomic X-ray data and nuclear (pi(-), K+) data. We theoretically demonstrate the inclusive (K-, pi(+)) spectra of the Sigma(-) unstable bound states on Si-28, Ni-58, and Pb-208 targets at incident K- lab momenta p(K) = 400-800 MeV/c. The results show that the near-recoilless (K-, pi(+)) reaction on the Ni-58 target gives a clear candidate to confirm properties of the Sigma-nucleus potentials having a repulsion inside the nuclear surface and an attraction outside the nucleus with a sizable absorption, whereas details of the repulsion of the potential at the nuclear center cannot be determined by the inclusive spectra. This is a promising attempt to extract properties of the Sigma-nucleus potential in the nucleus at forthcoming J-PARC experiments, as a full complement to the analyses of the Sigma(-) atomic and (pi(-), K+) data. (C) 2009 Elsevier B.V. All rights reserved.
  • T. Harada, A. Umeya, Y. Hirabayashi
    PHYSICAL REVIEW C 79 (1) 014603  0556-2813 2009/01 [Refereed][Not invited]
     
    We theoretically examine production of the neutron-rich Li-10(Lambda) hypernucleus by a double-charge exchange (pi(-), K+) reaction on a B-10 target with distorted-wave impulse approximation calculations. We calculate the inclusive spectrum at the incident momentum 1.20 GeV/c by a one-step mechanism pi(-) p -> K+Sigma(-) via Sigma(-) doorways caused by a Sigma(-) p <-> Lambda n coupling. The resultant spectrum can explain the magnitude of the recent experimental data, so that the Sigma(-) admixture probability in Li-10(Lambda) is found to be of the order of 10(-1)%. The (pi-, K+) reaction provides the ability to extract properties of wave functions with Lambda-Sigma coupling effects in neutron-rich nuclei, as well as the reaction mechanism.
  • S. Ohkubo, Y. Hirabayashi
    Journal of Physics: Conference Series 111 (1) 012014-1 - 012014-4 1742-6596 2008/05/01 [Refereed][Not invited]
     
    It is shown that a dilute property of an a particle condensate can be seen in the Airy structure of nuclear rainbow and prerainbow scattering. The dilute property of the Hoyle state of 12C with a developed α cluster structure is discussed by studying refractive 3He+ 12C and α + 12C scattering. © 2008 IOP Publishing Ltd.
  • S. Ohkubo, Y. Hirabayashi
    PHYSICAL REVIEW C 77 (4) 041303  0556-2813 2008/04 [Refereed][Not invited]
     
    The existence of a higher nodal band state with a (3)He cluster structure, i.e., a vibrational mode in which the intercluster relative motion is excited in (19)Ne in addition to those with the alpha cluster structure in (20)Ne and the (16)O cluster structure in (32)S, is suggested, which reinforces the importance of the concept of (3)He clustering in nuclei. This conclusion was reached by investigating (3)He scattering from (16)O in a wide range of incident energies and prerainbow oscillations.
  • Prerainbow Oscillation in 3He Scattering from the Hoyle State of 12C and Alpha Particle
    S. OHKUBO, Y. HIRABAYASHI
    Proc. Int. Symp. Physics of Unstable Nuclei 92 - 97 2008 [Refereed][Not invited]
  • Development of Experimental Nuclear Reaction Data File for Astrophysics
    N. Otuka, M. Aikawa, Y. Hirabayashi, A. Ohnishi, K. Kato
    AIP Conference Proceedings 1016 156 - 161 2008 [Refereed][Not invited]
  • Alpha particle condensation in 12C and nuclear rainbow scattering
    S Ohkubo, Y Hirabayashi
    AIP Conference Proceedings 1012 407 - 409 2008 [Refereed][Not invited]
  • S. Ohkubo, Y. Hirabayashi
    PHYSICAL REVIEW C 75 (4) 044609  0556-2813 2007/04 [Refereed][Not invited]
     
    We have analyzed He-3 scattering from C-12 at 34.7 and 72 MeV in a coupled channel method with a double folding potential derived from the precise wave functions for the ground 0(+) state and 0(2)(+) (7.65 MeV) Hoyle state, which has been suggested to be an alpha particle condensate. It is found that strong refraction of He-3 in the Hoyle state can be clearly seen in the experimental angular distribution at a low incident energy region as an Airy minimum of the prerainbow oscillations.
  • T Harada, Y Hirabayashi
    NUCLEAR PHYSICS A 767 206 - 217 0375-9474 2006/03 [Refereed][Not invited]
     
    We investigate theoretically the Sigma(-) hypernuclear production by the inclusive (pi(-), K+) reaction on a neutron-excess Bi-209 target in the framework of a distorted wave impulse approximation with an optimal Fermi-averaging for the elementary pi(-) + p -> K+ + Sigma(-) t-matrix. In order to study the Sigma-nucleus potentials constructed with isoscalar and isovector components, we compare the calculated spectra of the Bi-209(pi(-), K+) reaction with the experimental data at KEK, using several Sigma-nucleus (optical) potentials for Sigma(-)-Pb-208 which are determined by fits to the Sigma(-) atomic X-ray data. Our analysis confirms that the potentials having a repulsion inside the nuclear surface and an attraction outside the nucleus with a sizable absorption, can well reproduce the data. But it is still difficult to discriminate among the radial distributions of these potentials inside the heavy nucleus. The contribution of the isovector component in the potential is not determined uniquely by the Bi-209(pi(-), K+) spectrum. (c) 2006 Elsevier B.V. All rights reserved.
  • Is the Σ-nucleus potential for Σ- atoms consistent with the 28Si(π-,K+) reactions data ?
    Toru Harada, Yoshiharu Hirabayashi
    Nuclear Physics A 759 (1,2) 143 - 169 2005/09 [Refereed][Not invited]
  • T Harada, Y Hirabayashi
    NUCLEAR PHYSICS A 744 323 - 343 0375-9474 2004/11 [Refereed][Not invited]
     
    In order to describe A quasi-free production spectra from (pi(+), K+) reactions, we propose an optimal Fermi-averaging for the elementary pi(+) + n --> K+ + Lambda t-matrix in a nucleus under the on-energy-shell condition. We calculate these quasi-free spectra for (pi(+), K+) reactions on a C-12 target at p(pi) = 1.20 GeV/c and 1.05 GeV/c, and compare them with experimental data. The results show that the shape and magnitude of the spectra can explain the data, because the optimal Fermi-averaged t-matrix gives a good description of the energy-dependence in the spectra. The Lambda quasi-free spectra on a heavier Si-28 target are also discussed. (C) 2004 Elsevier B.V. All rights reserved.
  • S Ohkubo, Y Hirabayashi
    PHYSICAL REVIEW C 70 (4) 041602  0556-2813 2004/10 [Refereed][Not invited]
     
    It is shown that the dilute density distribution of alpha particles in nuclei can be observed in the Airy structure in nuclear rainbow scattering. We have analyzed alpha+C-12 rainbow scattering to the 0(2)(+) (7.65 MeV) state of C-12 in a coupled-channel method with the precise wave functions for C-12. It is found that the enhanced Airy oscillations in the experimental angular distributions for the 0(2)(+) state is caused by the dilute density distribution of this state in agreement for the idea of Bose-Einstein condensation of the three alpha particles.
  • M. Ito, Y. Hirabayashi, Y Sakuragi
    Physical Review 66 (3) 034307  0556-2813 2002/09 [Refereed][Not invited]
  • Y Hirabayashi, S Ohkubo
    PHYSICS OF ATOMIC NUCLEI 65 (4) 683 - 688 1063-7788 2002/04 [Refereed][Not invited]
     
    In order to understand the alpha-nucleus interactions for the alpha + C-12 similar to alpha + O-16 systems systematically, a scattering from 12C is studied in a microscopic coupled-channel model using a folding potential and realistic microscopic wave functions of 12C. The experimental angular distributions of elastic and inelastic scattering to the 2(+) (4.43 MeV), 3(-) (9.64 MeV), and 0(2)(+) (7.66 MeV) states in the range of E-alpha = 41-172.5 MeV are analyzed. (C) 2002 MAIK "Nauka/Interperiodica".
  • Y. Hirabayashi, T. Suzuki, M. Tanifuji
    Physical Review 64 (5) 054605  0556-2813 2001/11 [Refereed][Not invited]
  • M. Ito, Y. Sakuragi, Y. Hirabayashi
    Physical Review C 63 (6) 064303  0556-2813 2001/01 [Refereed][Not invited]
  • Channel coupling effect in resonant breakup of 42MeV 7Li with 58Ni target", Dhruba Gupta, C. Samanta, A. Chatterijee, K. Rusek and Y. HirabayashiChannel coupling effect in resonant breakup of 42MeV 7Li with 58Ni target
    Dhruba Gupta, C. Samanta, A. Chatterijee, K. Rusek, Y. Hirabayashi
    Journal of physics. G, Nuclear and particle physics 26 L81 - L86 2000 [Refereed][Not invited]
  • Relation Between (p,p') and (d,d') on 12C in the Sudden Approximation
    Y. Hirabayashi, T. Suzuki, M. Tanifuji
    Proceedings RCNP-TMU Sympsium SPIN IN NUCLEAR AND HADRONIC REACTION 56 - 61 2000 [Refereed][Not invited]
  • Microscopic Coupled-Channel Study of 12C+12C Resonant Reaction
    M. Ito, Y. Sakuragi, Y. Hirabayash
    Few-Body Systems Suppl. 12 137 - 140 2000 [Refereed][Not invited]
  • Microscopic coupled-channel study of heavy-ion resonances in multi-cluster exit channels
    Y Sakuragi, M Ito, M Katsuma, M Takashina, Y Kudo, Y Hirabayashi, S Okabe, Y Abe
    PROCEEDINGS OF THE 7TH INTERNATIONAL CONFERENCE ON CLUSTERING ASPECTS OF NUCLEAR STRUCTURE AND DYNAMICS 138 - 142 2000 [Refereed][Not invited]
     
    Heavy-ion resonances recently discovered in nuclear collisions of C-12+C-12 and O-16+O-16 systems leading to multi-cluster exit channels, C-12+C-12 --> 3 alpha+C-12, 3 alpha +3 alpha, 2 alpha+O-16 and O-16+O-16 --> (alpha+C-12)+O-16, (alpha+C-12)+(alpha+C-12), are studied theoretically by the coupled-channel (CC) and coupled-channel Born approximation (CCBA) calculations using microscopic cluster-model wave functions of the colliding nuclei, C-12 and O-16, and nucleus-nucleus interactions based on the realistic G-matrix interaction. These resonance states correspond to highly excited states of the compound systems, Mg-24 and S-32 nuclei, at excitation energies more than 40 similar to 55 MeV. The the microscopic CC and CCBA calculations well reproduce the characteristic features of these new resonance states.
  • M. Ito, Y. Sakuragi, Y. Hirabayashi
    The European Physical Journal A 5 (4) 373 - 383 1434-6001 1998/08 [Refereed][Not invited]
  • S. Ohkubo, Y. Hirabayashi, T. Sakuda
    Physics Review C 57 (5) 2760 - 2762 0556-2813 1998/05 [Refereed][Not invited]
  • Heavy-ion resonance and multi-cluster states in highly excited nuclei
    Y Sakuragi, M Ito, M Katsuma, M Takashina, Y Hirabayashi, S Okabe, Y Abe
    PROCEEDINGS OF THE XVII RCNP INTERNATIONAL SYMPOSIUM ON INNOVATIVE COMPUTATIONAL METHODS IN NUCLEAR MANY-BODY PROBLEMS 196 - 204 1998 [Refereed][Not invited]
     
    Heavy-ion resonances recently observed in the collisions of C-12+C-12 and O-16+O-16 systems leading to the multi-cluster exit channels are studied theoretically. The excitation of C-12 and O-16 to the states having the 3 alpha and alpha+C-12 cluster configurations are explicitly taken into account by the coupled-channels (CC) calculation using microscopic form factors based on the microscopic cluster-model wave functions. The calculation reproduces the essential features of the resonances observed in the multi-cluster exit channels surprisingly well. A prominent resonance structure is also predicted in the Be-8+O-16 system by the CC calculation with the Be-8 excitations treated explicitly, which suggests a possible explanation of the resonances observed in the C-12+C-12 --> B-8+O-16 alpha-transfer reactions.
  • Sakuragi, M. Ito, Y. Hirabayashi, C. Samanta
    Progress of Theoretical Physics 98 (2) 521 - 525 0033-068X 1997/08 [Refereed][Not invited]
  • D OKelly, T Botting, B Hurst, RP Schmitt, YW Lui, Y Hirabayashi, S Okabe, Y Sakuragi, H Utsunomiya, T Yamagata, M Ohta
    PHYSICS LETTERS B 393 (3-4) 301 - 306 0370-2693 1997/02 [Refereed][Not invited]
     
    Coincidence measurements of alpha-C-12 pairs collinearly emitted in the breakup of 30 MeV/u- O-16 incident on Pb-208 and Sn-120 were performed with a two detector system set up along the focal plane of a magnetic spectrograph. Double differential cross sections for sequential breakup via the 2(2)(+) and 2(3)(+) states in O-16 were analyzed within the framework of coupled-channels (CC) calculations which incorporated microscopic alpha-C-12 cluster model wave functions for bound and unbound states of O-16, The experimental data are satisfactorily reproduced by the CC calculations to within a factor of two. The results are discussed in terms of the interference between nuclear- and Coulomb-breakup amplitudes.
  • 3α + 3α Structure of Highly Excited States in 24Mg
    M. Ito, Y. Sakuragi, Y. Hirabayashi, Y. Abe
    Proceedings THE XVII RCNP INTERNATIONAL SYMPOSIUM ON INNOVATIVE COMPUTATIONAL METHOD IN NUCLEAR MANY-BODY SYSTEMS 229 - 231 1997 [Refereed][Not invited]
  • Y. Hirabayashi, Y. Sakuragi, Y. Abe
    Physical Review Letters 74 (21) 4141 - 4144 1995/05 [Refereed][Not invited]
  • Y. Sakuragi, S. Funada, Y. Hirabayashi
    Nuclear Physicsd A 588 (1) 65C - 69C 0375-9474 1995/05 [Refereed][Not invited]
  • Coulomb Dissociation of Halo Nuclei and its Effect on the Elastic Scattering
    Y. Sakuragi, S. Funada, Y. Hirabayashi
    Third IN2T3-RIKEN Symposium on Heavy Ion Collisions 39 - 46 1995 [Refereed][Not invited]
  • Theoretical Study of 16O → α + 12C Breakup Reaction
    Y. Hirabayashi, Y. Sakuragi
    Proc. Int. Symp. Tours Symposium on Nuclear Physics II 118 - 125 1995 [Refereed][Not invited]
  • Breakupo of 16O on The Way to The Astrophysical Problem in Astrophysical Interes
    H. Utsunomiya, M. Yamagami, Y. Hirabayashi, M. Hirai, H. Sakurai, T. Ichihara, M. Kamimura, S. Kato, S. Kubono, T. Motobayashi, S. Okabe
    Proc. Int. Symp. Tours Symposium on Nuclear Physics II 126 - 131 1995 [Refereed][Not invited]
  • T.Yamagata, H.Utsunomiya, S.Nakayama, H.Koori, M.Tanaka, A.Tamii, Y.Fujita, K.Katori, M.Inoue, M.Fujiwara, H.Ogata, Y.Hirabayashi
    Physical Review C 50 (5) 2606 - 2607 0556-2813 1994/11 [Refereed][Not invited]
  • Y.Hirabayashi, Y.Sakuragi, M.Tanifuji
    Physics Letters B 318 (1) 32 - 38 0370-2693 1993/11 [Refereed][Not invited]
  • Y HIRABAYASHI, Y SAKURAGI
    PHYSICAL REVIEW LETTERS 69 (13) 1892 - 1895 0031-9007 1992/09 [Refereed][Not invited]
     
    The nuclear-breakup and Coulomb-breakup contributions to the sequential breakup of 156-MeV Li-6 by Pb-208 via the 3+ resonance state of Li-6 at 2.186 MeV are investigated by three-body calculations based on the continuum-discretized coupled-channels method. The nuclear-breakup contribution is as important as the Coulomb-breakup one up to forward angles where the Coulomb breakup was believed to be dominant. The effects of multistep processes via various nonresonant continuum states due to the three-body dynamics are also found to be important.
  • Y HIRABAYASHI, Y SAKURAGI
    NUCLEAR PHYSICS A 536 (2) 375 - 396 0375-9474 1992/01 [Refereed][Not invited]
     
    Previously published coupled-channels (CC) analyses by Rusek et al. of polarized Li-6 elastic scattering by Mg-26 and Sn-120 at E(lab) = 44 MeV are reanalyzed. Excitations of Li-6 to its three lowest T = 0 excited states are taken into account in the framework of continuum-discretized coupled-channels (CDCC). The analyses are made with the use of the projectile-target interactions based on the cluster-folding (CF) model and those on the double-folding (DF) one. It is shown that the coupling to the Li-6-excited states has large contributions to the vector and tensor analyzing powers of the elastic scattering. A test of the accuracy of the weak-binding-energy approximation (WBEA), which was used in the previous analyses, is made in comparison with the results of the CDCC calculation. It is also pointed out that there exists an ambiguity in the deuteron-target spin-orbit interaction, which affects the conclusion on the competition between the folding spin-orbit interaction and the projectile-excitation effects in the vector analyzing power.
  • Y.Hirabayashi
    Physical Review C 44 (4) 1581 - 1587 0556-2813 1991/10 [Refereed][Not invited]
  • ANOMALOUS RENORMALIZATION OF CLUSTER-FOLDING INTERACTIONS FOR LI-6-NUCLEUS SCATTERING AT LOW ENERGIES
    Y HIRABAYASHI, Y SAKURAGI
    PHYSICS LETTERS B 258 (1-2) 11 - 16 0370-2693 1991/04 [Refereed][Not invited]
     
    The validity of cluster-folding (CF) interactions for elastic scattering of Li-6 by various nuclei is investigated in the alpha + d + target three-body model. The Li-6 --> alpha + d breakup process is taken into account in the framework of the continuum-discretized coupled-channels (CDCC). It is shown that, at low energies below E(lab)/A(p) congruent-to 10 MeV, the real part of the CF potentials has to be reduced by about (40-50)%, even when the resonant and non-resonant breakup channels are explicitly included in the CDCC calculations, while no renormalization is necessary for fits to scattering at higher energies.
  • Is Coulomb Dissociation Method Applicable to Astrophysics ?
    Y. Sakuragi, Y. Hirabayashi
    Proc. Int. Symp. Origin and Evolution of the Elements 220  1991 [Refereed][Not invited]
  • LI-11-]LI-9+2N BREAKUP EFFECT ON LI-11-NUCLEUS ELASTIC-SCATTERING
    Y HIRABAYASHI, S FUNADA, Y SAKURAGI
    STRUCTURE AND REACTIONS OF UNSTABLE NUCLEI 227 - 232 1991 [Refereed][Not invited]
  • Coupled-channels analysis of 6Li scattering at 44 MeV
    Y. Hirabayashi, Y. Sakuragi
    Inst. Phys. Conf. 110 (3) 323 - 330 1991 [Refereed][Not invited]
  • Projectile breakup effect in elastic and inelastic scattering of 9Be
    Y. Hirabayashi
    Proceedings of the RIKEN Synposium on LIGHT AND LIGHT-HEAVY INO REACTIONS 174 - 183 1989/12 [Refereed][Not invited]
  • Y.Hirabayashi, S.Okabe, Y.Sakuragi
    Physics Letters B 221 (3/4) 227 - 232 0370-2693 1989/05 [Refereed][Not invited]
  • Roles of Breakup Processes in Light Heavy-Ion Scattering
    Y. Sakuragi, Y. Hirabayashi
    Proc. Fifth Int. Conf. Clustering Aspects in Nucl. and Subnucl. Systems 58 (suppl.) 560 - 566 1988 [Refereed][Not invited]

MISC

  • S Ohkubo, Y Hirabayashi  PHYSICAL REVIEW C  70-  (4)  041602(R)  2004/10  [Not refereed][Not invited]
     
    It is shown that the dilute density distribution of alpha particles in nuclei can be observed in the Airy structure in nuclear rainbow scattering. We have analyzed alpha+C-12 rainbow scattering to the 0(2)(+) (7.65 MeV) state of C-12 in a coupled-channel method with the precise wave functions for C-12. It is found that the enhanced Airy oscillations in the experimental angular distributions for the 0(2)(+) state is caused by the dilute density distribution of this state in agreement for the idea of Bose-Einstein condensation of the three alpha particles.
  • Optimal Fermi-averaging for the pi+ + n -> K+ + Lambda t-matrix in Lambda-hypernuclear production from (pi+,K+) reactions
    NUCLEAR PHYSICS A  744, 323-  2004  [Not refereed][Not invited]
  • M Ito, Y Hirabayashi, Y Sakuragi  PHYSICAL REVIEW C  66-  (3)  034307  2002/09  [Not refereed][Not invited]
     
    The nuclear structure of Mg-24 with C-12+3alpha and 3alpha+3alpha configurations, existing at an extremely highly-excited energy domain is studied by the microscopic coupled-channels (MCC) calculation based on the double-folding interactions using 3alpha-RGM wave functions of C-12 and a realistic nucleon-nucleon interaction called DDM3Y. The dinuclear C-12+C-12 configuration of Mg-24, corresponding to the so-called "higher-energy molecular resonances," is also investigated by the same MCC framework. The MCC calculation predicts the existence of three kinds of the molecular bands having 3alpha+3alpha, C-12+3alpha, and C-12+C-12 structures around the excitation energy of about 40 MeV with respect to the ground state of Mg-24. The channel coupling among the 3alpha states in each C-12 plays very important roles for the formation of the C-12+3alpha and 3alpha+3alpha molecular bands. It is found that the populations of the C-12(g.s.)+C-12(g.s.), C-12(g.s.)+C-12(0(2)(+)), and C-12(0(2)(+))+C-12(0(2)(+)) channels are very small in the individual molecular bands with C-12+C-12, C-12+3alpha, and 3alpha+3alpha configurations, respectively. The reaction mechanism for the inelastic scattering leading to the C-12(g.s.)+C-12(0(2)(+)) and C-12(0(2)(+))+C-12(0(2)(+)) excitation channels is also investigated in relation to the obtained three kinds of the molecular bands. The result suggests that the inelastic scattering to the C-12(0(2)(+))+C-12(0(2)(+)) [C-12(g.s.)+C-12(0(2)(+))] channel can be interpreted in terms of weak transitions from the C-12(g.s.)+C-12(g.s.) component of the C-12+C-12 molecular bands to the C-12(0(2)(+))+C-12(0(2)(+)) [C-12(g.s.)+C-12(0(2)(+))] component of the multicluster 3alpha+3alpha (C-12+3alpha) molecular bands. All the results are discussed in connection with the band crossing model which was proposed in describing the higher-energy molecular resonance with dinuclear configuration as well as the resonances observed in the C-12(0(2)(+))+C-12(0(2)(+)) and C-12(g.s.)+C-12(0(2)(+)) exit channels.
  • Physics of Atomic Nuclei  65, 683-  2002  [Not refereed][Not invited]
  • Relation between(p,p')and(d,d')on12C in the sudden approximation
    Proc. RCNP-TMU Symp. Spin in Nuclear and Hadronic Reactions(World Scientific)  56  2000  [Not refereed][Not invited]
  • Microscopic Coupled-Channel Study of12C+12C Resonance Reactions
    Few-Body Systems Suppl.  12-  137  2000  [Not refereed][Not invited]
  • Channel coupling effect in resonant breakup of 42MeV 7Li with 58Ni target
    Journal of Physics G: Nuclear and Particle Physics  (26)  L81  2000  [Not refereed][Not invited]
  • Microscopic Coupled-Channel Study of Heavy-Ion Resonances in Multi-Cluster Exit Channels
    The 7th International Conference on Clustering Aspects of Nuclear Structure and Dynamics(would Scientific)  138  1999  [Not refereed][Not invited]
  • THE EUROPEAN PHYSICAL JOURNAL  (A5)  373  1999  [Not refereed][Not invited]
  • 3α+3α Structure of Highly Excited States in 24Mg
    The (]G0010[)(]G0007[) RCNP International Symposium on Innovative Computational Method in Nuclear Many-Body Systems (World Sientific)  229  1998  [Not refereed][Not invited]
  • Heavy-Ion Resonance and Multi-Cluster States in Highly Excited Nuclei
    The (]G0010[)(]G0007[) RCNP International Symposium on Innovative Computational Method in Nuclear Many-Body Systems (World Sientific)  196  1998  [Not refereed][Not invited]
  • Physical Review C  57-  (5)  2760  -2762  1998  [Not refereed][Not invited]
  • D OKelly, T Botting, B Hurst, RP Schmitt, YW Lui, Y Hirabayashi, S Okabe, Y Sakuragi, H Utsunomiya, T Yamagata, M Ohta  PHYSICS LETTERS B  393-  (3-4)  301  -306  1997/02  [Not refereed][Not invited]
     
    Coincidence measurements of alpha-C-12 pairs collinearly emitted in the breakup of 30 MeV/u- O-16 incident on Pb-208 and Sn-120 were performed with a two detector system set up along the focal plane of a magnetic spectrograph. Double differential cross sections for sequential breakup via the 2(2)(+) and 2(3)(+) states in O-16 were analyzed within the framework of coupled-channels (CC) calculations which incorporated microscopic alpha-C-12 cluster model wave functions for bound and unbound states of O-16, The experimental data are satisfactorily reproduced by the CC calculations to within a factor of two. The results are discussed in terms of the interference between nuclear- and Coulomb-breakup amplitudes.
  • Yukinori Sakuragi, Makoto Ito, Yoshiharu Hirabayashi, Chhanda SAMANTA  Progress of Theoretical Physics  98-  (2)  521  -525  1997  [Not refereed][Not invited]
  • Y. Sakuragi, S. Funada, Y. Hirabayashi  Nuclear Physics, Section A  588-  (1)  c65  -c69  1995/05/29  [Not refereed][Not invited]
  • Coulomb Dissociation of Halo Nuclei and its Effect on Elastic Scattering
    Third IN2T3-RIKEN Symposium on Heavy Ion Collisions (World Sientific)  39  1995  [Not refereed][Not invited]
  • Breakup of 16O on The Way to The Astrophysical Problem
    ours symposium on Nuclear Physics 〓(World Scientiffic)  126  1995  [Not refereed][Not invited]
  • Theoretical Study of 16→2+12C Breakup Reaction in Astophysical interest
    Tours symposium on Nuclear Physics 〓(World Scientiffic)  118  1995  [Not refereed][Not invited]
  • PHYSICAL REVIEW LETTERS  74-  (21)  4141  1995  [Not refereed][Not invited]
  • PHYSICS LETTERS B  318-  (1)  32  -38  1993  [Not refereed][Not invited]
  • NUCLEAR PHYSICS A  536-  (2)  375  -396  1992  [Not refereed][Not invited]
  • PHYSICAL REVIEW LETTERS  69-  (13)  1892  -1895  1992  [Not refereed][Not invited]
  • Is Coulomb Dissosiation Method Applicable to Astrophysics?
    Origin and Evolution of the Elements (World Sientific)  220  1991  [Not refereed][Not invited]
  • LI-11-]LI-9+2N BREAKUP EFFECT ON LI-11-NUCLEUS ELASTIC-SCATTERING
    Y HIRABAYASHI, S FUNADA, Y SAKURAGI  STRUCTURE AND REACTIONS OF UNSTABLE NUCLEI  227  -232  1991  [Not refereed][Not invited]
  • Coupled-channels analysis of 6Li scattering at 44Mev
    Heavy Ion Collisions at Energies Near Coulomb Barrier 1990(IOP Publishing)  1991  [Not refereed][Not invited]
  • Anomolous renormalization of cluster-folding interactions for 6Li-nucleus scattering at low energies(共著)
    PHYSICS LETTERS B  258-  (1)  2,11  1991  [Not refereed][Not invited]
  • PHYSICAL REVIEW C  44-  (4)  1581  -1587  1991  [Not refereed][Not invited]
  • Roles of Breakup Processes in Light Heavy-Ion Scattering
    Supplement of the Journal of the Physical Society of Japan  58-  560  1989  [Not refereed][Not invited]
  • PHYSICS LETTERS B  221-  (3)  4,227  1989  [Not refereed][Not invited]

Research Grants & Projects

  • 直接核反応論
  • Direct Nuclear Reaction Theory

Educational Activities

Teaching Experience

  • Inter-Graduate School Classes(General Subject):Inter-Disciplinary Sciences
    開講年度 : 2018
    課程区分 : 修士課程
    開講学部 : 大学院共通科目
    キーワード : 情報教育, 情報倫理, 教育の情報化, 指導実践
  • Introduction to Informatics I
    開講年度 : 2018
    課程区分 : 学士課程
    開講学部 : 全学教育
    キーワード : 情報活用,情報社会,情報科学
  • People and Culture
    開講年度 : 2018
    課程区分 : 学士課程
    開講学部 : 全学教育
    キーワード : プログラミング,情報活用能力,オブジェクト指向,Ruby
  • People and Culture
    開講年度 : 2018
    課程区分 : 学士課程
    開講学部 : 全学教育
    キーワード : プログラミング,情報活用能力,オブジェクト指向


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