Study of Nuclear Resonance States by Means of Complex Scaling Method

复标度法研究核共振态

• 批准号: 08640340
• 负责人: KATO Kiyoshi
• 金额: $ 1.41万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08640340/
• 关键词: Neutron-Rich Nuclei; Complex Scaling Method; Resonances; Extended Completeness Relation; Sum-Rule; Pairing; Pauli Blocking; 原子核; 強度関数; ソフトダイポール共鳴; E1和則値; ソフト・ダイポール励起; クーロン分解反応

In this project, we have performed the following subjects :A) Study about resonance states of various kinds of nuclear systems by means of the complex scaling method, andB) Development of the complex scaling method in order to apply to various kinds of analyses of resonance phenomena.For these subjects, we have obtained the following results :A-1) In studies of neutron-rich. nuclei,(i) we performed investigations of the neutron halo structure using a core+n+n cluster model, and obtained important results on the evidence of pairing correlations in neutron-rich nuclei,(ii) we discussed the inversion problem of s- and rho-orbits in unstable nuclei, and found the importance on the Pauli-blocking effect in Li-isotopes.(iii) we analyzed energy shifts of weakly-bound and resonance states in mirror nuclei, and found that the barrier effect is very important in resonance states in addition to the Thomas-Ehrman shift in bound states.A-2) Open channel effects on the mass spectrum of charmonium.A-3) Resonance mechanism in the ^<12>C+^<12>C system.B-1) A new calculational method of matrix elements of physical quantities between resonant states.B-2) A new method to see the contributions from resonant states to the transition strength.B-3) A new formalism of the extended completeness relation using the complex scaling method.

在这个项目中，我们完成了以下课题：A）通过复标度方法研究各种核系统的共振状态，以及B）开发复标度方法以应用于各种共振分析对于这些课题，我们获得了以下结果：A-1) 在富中子的研究中。原子核，(i)我们使用核心+n+n簇模型对中子晕结构进行了研究，并在富中子原子核配对相关性的证据方面获得了重要结果，(ii)我们讨论了s-反演问题和不稳定核中的rho轨道，并发现了Li同位素中泡利阻挡效应的重要性。(iii)我们分析了镜中弱束缚态和共振态的能量转移原子核，并发现除了束缚态的托马斯-埃尔曼位移之外，势垒效应在共振态中也非常重要。A-2) 开通道对粲素质谱的影响。A-3) ^< 中的共振机制12>C+^<12>C系统。B-1) 一种新的谐振态之间物理量矩阵元素的计算方法。B-2) 一种查看谐振态对跃迁强度贡献的新方法。B-3 ) 一个使用复标度方法的扩展完整性关系的新形式主义。