Formation Mechanism and Structure of Three-body Resonances in Nuclear System

核系统三体共振的形成机制和结构

• 批准号: 08640359
• 负责人: IKEDA Kiyomi
• 金额: $ 1.34万
• 依托单位: Niigata 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-08640359/
• 关键词: Complex Scaled Method; Resoncmce State; Neutron Excess Nuclei; Halo Structure; Isospin-Multiplet; Thomas-Ehermass-effect; Pairing Corvelation; Pauli-blocking; アインスピン多重項; パウリブロッキング; 3体クラスター構造; 複索座標スケーリング法; E1和則値; ソフト・タイポール励起; クーロン分解反応; 複素座標ス

The comlex-scaling method enable us the structural analyses for the resonance states of nuclear finite many body systems just in same standard as for the bound states. First success under the present research project is the analysis of the ground resonance state of ^<10>He. The energy and width of the three body system of ^8He+n+n are solved by adopting the folding-type ^8He-n potential being consistent to the ^9Li-n folding potential which is employed succsesfully in description of the halo structure of ^<11>Li. Second successful result is the structural analysis of the s-orbital resonance states of ^<10>N and ^<10>Li. The neutron s-orbital resonance is thought to be difficult to observe because it appears as virtual resonance or broad resonance. Therefore, the resonance state being isospin-multiplet in the mirror nucleus ^<10>N.where there is Coulomb barrier. should give an important information of the s-orbital state. Our analysis predict the resnance energy with its narrow width.Th … More e recent most important results are following two items : (1) we make clear the mechanism of the anomalous energy shift between s-states in mirror nuclei with a hero structure. and (2) we give a quantitative reasoning of the closing of the energy levels between the P_<1/2> and S_<1/2> in ^<10>Li orbital states which is due to the dynamical effect on the ^9Li-n interaction induced by Pauli blocking of the j^p= 0^+ pairing correlation. As for (1), anormalous energy shift between s-orbital isospin-multiplet states in mirror nuclei has been known as the Thomas-Eherman effect due to the Coulomb potential. We have analize the energy shifts for the s-orbital states in mirror nuclei for the cases with neutron halo structure. As the result, a large energy shift is reasonably explained by the conbination of two mechanisum of the kinetic energy reduction and the Coulomb energy reduction. As for (2). theoretical analisis gives the new reas oning that in non-deformed nucleus of Li the closing of the P_<1/2>-S_<1/2> states is due to the Pauli-blocking of the most important pairing states with (p_<1/2>) ^2J=0. Less

复尺度方法使我们能够以与束缚态相同的标准对核有限多体系统的共振态进行结构分析，本研究项目的第一个成功是^<10>的基共振态的分析。采用与描述中成功使用的^9Li-n折叠势一致的折叠式^8He-n势来求解^8He+n+n三体系统的能量和宽度。 ^<11>Li 的晕结构。第二个成功的结果是 ^<10>N 和 ^<10>Li 的 s 轨道共振态的结构分析 中子 s 轨道共振被认为是难以观察的。它表现为虚共振或宽共振，因此，存在库仑势垒的镜像核^<10>N中的共振态应该给出重要的信息。我们的分析预测了其窄宽度的共振能量。Th…最近最重要的结果有以下两项：（1）我们阐明了镜核中s态之间异常能量转移的机制。 (2)我们给出了^<10>Li轨道态中P_<1/2>和S_<1/2>之间能级闭合的定量推理，这是由于动力学效应造成的。由泡利阻断 j^p= 0^+ 配对相关性引起的 ^9Li-n 相互作用 至于 (1)，镜像核中 s 轨道同位旋多重态之间的异常能量转移被称为托马斯-埃赫曼 (Thomas-Eherman)。我们分析了具有中子晕结构的情况下镜核中 s 轨道态的能量偏移。动能减少和库仑能减少两种机制的结合给出了Li非变形核中P_<1/2>-S_<闭合的新推理。 1/2> 状态是由于最重要的配对状态 (p_<1/2>) ^2J=0 的泡利阻塞所致。