低および中高エネルギー領域の核衝突の微視的研究

1995 Fiscal Year Annual Research Report

• Project/Area Number: 07304030
• Research Category: Grant-in-Aid for Co-operative Research (A)
• Research Institution: Kyoto University
• Principal Investigator: 堀内 昶 京都大学, 大学院・理学研究科, 助教授 (60027349)
• Co-Investigator(Kenkyū-buntansha): 香村 俊武 筑波大学, 物理学系, 教授 (20015556) ; 大塚 孝治 東京大学, 大学院・理学系研究科, 助教授 (20201379) ; 市村 宗武 東京大学, 教養学部, 教授 (10012436) ; 大坪 久夫 大阪大学, 大学院・理学研究科, 教授 (30029491) ; 滝川 昇 東北大学, 大学院・理学研究科, 助教授 (00125600)
• Keywords: 微視的シミュレーション理論 / 直接反応理論 / 不安定核 / 分子的構造 / スピン・アイソスピン励起 / 重陽子分解反応 / 相対論的平均場近似 / クラスター構造

Research Abstract

本研究計画の主要課題毎に研究実績の概要を述べると以下のようである。(i)「核反応の微視的シミュレーション理論による研究」の課題については、反対称化分子動力学(AMD)理論の統計的性質が古典的か量子的かにつき国際的にも論議をよび、その解明が著しく進展した。また軽イオン反応にAMD、量子分子動力学(QMD)がともに適用されて多くの成功を収めるとともに、「直接反応理論による研究」の分野の研究者との間に活発な研究交流が為されようになっている。QMDへの相対論的運動学導入や、QMDでの波束幅の時間変化などの研究も興味深い結果を得た。またハイパー核生成反応の研究も進展した。(ii)「直接反応理論による研究」の課題については、準弾性散乱領域でのスピン・アイソスピン励起が△粒子励起も扱い応答関数法とDWIAで研究され、重陽子分解反応が偏極量を中心に広いエネルギー領域で研究された。また、天体物理学的エネルギー領域での核子移行反応や中性子捕獲反応が研究され、後者は中間子交換電流の研究に進展を与えた。(iii)「不安定核の構造と反応」の課題については、中性子過剰核を用いた時間依存Hartree-Fock法による反応研究、中性子過剰核構造の変形殻模型、RPA法や共鳴準位まで含めた少数多体クラスター理論による研究、中性子過剰核における種々の構造変化の反対称化分子動力学による研究など強力且つ斬新な研究が展開されています。また相対論的平均場近似と非相対論的スカ-ムHartree-Fock法による陽子及び中性子密度分布や変形の研究が進展し興味深い知見が得られた。(iv)「分子的構造と核反応機構」の課題については、我国のクラスター模型研究の卓越した研究実績に基づいた様々な進展が新しい理論の開発を伴いつつ行われた。例えば、軽い中性子過剰核での新たなクラスター構造の発現のAMDによる研究、中性子過剰核の反応研究における分子軌道法の適用などである。^<12>C、^<16>Oのαクラスター単位のAMD法による研究、pf-殻領域のクラスター構造研究、6α鎖構造研究、複合粒子間相互作用理論を導入したFaddeev計算などにおいても多くの成果を挙げた。

Research Products

• [Publications] S. Aoyama: "Theoretical Prediction of Low-Lying Three-Body Resonance states in ^6He" Pregress of Theoretical Physies. 94. 596-599 (1995)
• [Publications] G. F. Filippov: "On the Complete Basis of Pauli-Allowed States of Three-Clustor Systems in the Fock-Bargmann Space" Journal of Mathematical Physics. 36. 4571-4589 (1995)
• [Publications] N. Itagaki: "Microscopic α-Cluster Model for ^<12>C and ^<16>O Based on Antisymmetrizted Molecular Dynamics" Progress of Theoretical Physics. 94. 1019-1038 (1995)
• [Publications] Y. Nara: "Target Mass Dependence of ^4H Formation Mechanism from K^- Absorption at Rest" Physics Letters B. 346. 217-222 (1995)
• [Publications] A. Ohnishi: "Incorporation of Quantum Statistical Features in Molecular Dynamics" Physical Review Letters. 75. 596-599 (1995)
• [Publications] K. Hagino: "Effects of Finite Excitation Energy of Environment on Sudden Quantum Tunneling" Physical Review C. 51. 3190-3200 (1995)
• [Publications] S. Yoshida: "Surface Properties of Cs Isotopes" Physical Review C. 51. 157-163 (1995)
• [Publications] K. Hagino: "Path Integral Approach to Non-Coriolis Approximation in Heavy-Ion Collisions" Physical Review C. 52. 286-290 (1995)
• [Publications] Y. Yamashita: "Reaction Mechanism of ^<11>B (p, α) ^8Be Reaction at Astrophysically Relevant Energies" Nuclear Physies A. 589. 460-474 (1995)
• [Publications] T. Ogaito: "Polarization Phenomena in Hypernuclear Reaction" Progress of Theoretical Physics. 94. 199-213 (1995)
• [Publications] T. Kaneko: "Approximate Treatment of the Deuteron-Nucleus Interaction in the Resonating Group Formulation" Nuclear Physics A. 591. 209-226 (1995)
• [Publications] H. Kanada: "Scattering and Reaction Cross Sections in the p+α Systom with the Mulliconfiguration Resonating Group Method" Progress of Theoretical Physics. 94. 1061-1071 (1995)
• [Publications] E. I. Tanaka: "Proton Inelastic Scattering to Continuum Studied with Antisymmetrized Molecular Dynamiss" Physical Riview C. 52. 316-325 (1995)
• [Publications] Y. Kanada-En'yo: "Structure of Li and Be Isotopes studied with Antisymmetrized Molecular Dynamics" Physical Review C. 52. 628-646 (1995)
• [Publications] Y. Kanada-En'yo: "Neutron-Rich B Isotopes studied with Antisymmetrized Molecular Dynamics" Physical Review C. 52. 647-662 (1995)
• [Publications] A. Engel: "△Degrees of Freedom in Antisymmetrized Molecular Dynamics and (p, p') Reactions in the △ Region" Physical Review C. 52. 3231-3248 (1995)
• [Publications] H. Horiuchi: "Light Neutron-Rich Nuclei Studied with Antisymmetrized Molecular Dynamics" Nuclear Physics A. 588. 121-127 (1995)
• [Publications] T. Nagata: "N. N^^- Vacuum Polarizations and Meson Exchange Interactions in Finite Nuclei" Nuclear Physics. (校正中). (1996)
• [Publications] E. Uzu: "^2H^^→ (d^^→, p)^3H Reaction Calculations at 20-120 keV by the Four-Body Yakubovsky Equations with the Paris Potential" Few-Body Systems Supplement. 8. 97-101 (1995)
• [Publications] T. Sams: "Quasifree(d^^→, ^2He) Data" Physical Review C. 51. 1945-1960 (1995)
• [Publications] M. Wakamatsu: "The Problem in the Skyrme Model and the Fermion-Boson Non-Correspondence" Progress of Theoretical Physics Supplement. 120. 313-321 (1995)
• [Publications] M. Wakamatsu: "Tracing the Origin of the G_A Problem in the Skyrme Model" Progress of Theoretical Physics. 95. 143-173 (1996)
• [Publications] H. Kouno: "Effective Nucleon Mass, Incompressibility, and Third Derivative of Nuclear Binding Energy in the Nonliknear Relativistic Mean Field Theory" Physical Review C. 51. 1754-1761 (1995)
• [Publications] H. Kouno: "Effective Nucleon Mass, Incombressibility, and Third-Order Derivative of the Nuclear Saturation Curve in the Relativistic Mean Field Theory with Vector Meson Self-Interaction" Physical Review C. 52. 135-143 (1995)
• [Publications] G. J. Mathews: "Inhomogeneous Primordial Nucleosynthesis and New Abundance Constraints on Ω_bh^2" Astrophysical Journal. 456. 98-105 (1996)
• [Publications] Y. Yoshii: "Beryllium and Boron Abumdances of Metal-deficient Halo Stars and Accration of Interstellar Matter" Astrophysical Journal. 447. 184-190 (1995)
• [Publications] S. Kubono: "Structure of ^<24>Al for the Stellar Reaction Rate of 23Mg(p,σ)^<24>Al" Nuclear Physics A. 588. 521-536 (1995)
• [Publications] T. Kajino: "Inhomogeneous Big-Bang Model, Rerived, and Evolution 05 the Light Elemonts in Cosmic Rays" Nuclear Physics A. 588. 339C-344C (1995)
• [Publications] A. Kato: "Relativistic Medium Polarization Corrections to Nuclear Meson Exchange Interactions" Progress of Theoretical Physics. 94. 657-662 (1995)
• [Publications] S. Kinpara: "Relativistic Calculation of Two-Body Correlations in Newtron-Rich Light Nuclei" Progress of Theoretical Physics. 94. 1157-1161 (1995)
• [Publications] M. Hirsch: "Extended Operator Expansion Method for O_<22>ββ Decay" Zeitschrift fur Physik A. 352. 33-45 (1995)
• [Publications] S. Nakamura: "Up-Down Quark Mass Difference Effect in Nuclear Many-Body Systems" Physical Review Letters. 76. 881-884 (1995)
• [Publications] K. Niita: "Analysis of the (N, xN^1) Reactions by Quantum Molecular Dynamics plus Statistical Decay Model" Physical Review C. 52. 2620-2635 (1995)
• [Publications] T. Maruyama: "Relativistic Effects in Sinulations of Fagmentation Process with the Microscopic framework" Physics Letters B. 358. 34-39 (1995)
• [Publications] T. Maruyama: "Extension of Quantum Molecular Dynamics and Its Application to Heavy-Ion Colli sions" Physical Review C. 53. 297-304 (1996)
• [Publications] Iwamoto: "Collision of Deformed Nuclei : A Path to the Far Side of the Superheavy Island" Nuclear Physics A. 596. 329-354 (1996)
• [Publications] Y. Iseri: "Virtual Break up to Spin-Singlet States in Elastic Scattering of Deuterons from Nuclei" Physics Letters B. 354. 183-188 (1995)
• [Publications] B. Imanishi: "Fusion Cross Section for the Weakly Bound Neutron System ^<11>Be+^<10>Be at Energies below and near the Coulomb Barrier" Physical Review C. 52. 3249-3258 (1995)
• [Publications] W. von Oertzen: "A study of Coupled-Reaction Channel Effects in the ^<36>S+^<37>Cl System, Hybridization between single Particle Orbits" Zeitschrift fur Physik A. 353. 373-385 (1996)
• [Publications] M. Yokoyama: "Giant Quadrupole Excitation in Nuclei with Neutron Skin" Physical Review C. 52. 1122-1125 (1995)
• [Publications] T. Suzuki: "Magnetic Moment of ^<11>Be" Physics Letters B. 364. 69-74 (1995)
• [Publications] A. Mengoni: "Direct Radiative Capture of p-Wave Neutrons" Physical Review C. 52. 2334-2338 (1995)