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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

基本信息

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

项目摘要

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

复标度方法使我们能够对核有限多体系统的共振态进行与束缚态相同的结构分析。在本研究项目下的第一个成功之处是分析了^&lt；10；He的地面共振态。采用与^9Li-n折叠势一致的折叠型^8He-n势，求解了^8He+n+n三体系统的能量和宽度，成功地描述了^&lt；11&gt；Li的晕结构。第二个成功的结果是对^&lt；10&gt；N和^&lt；10&gt；Li的S轨道共振态进行了结构分析。中子S轨道共振被认为很难观察到，因为它看起来是虚共振或广义共振。因此，在存在库仑势垒的镜像核^&lt；10&gt；N中，共振态是同位旋多重态。应该给出S轨道状态的一个重要信息。我们的分析预测了窄宽度的共振能量。Th…最近最重要的结果有以下两点：(1)我们弄清了具有英雄结构的镜像核中S态之间的反常能量移动的机制。(2)定量地推导了在^&lt；10&gt；Li轨道态中，由于J^p=0^+泡利阻塞对^9Li-n相互作用的动力学影响，P_&lt；1/2&gt；与S_&lt；1/2&gt；在^&lt；10&gt；Li轨道态之间的能级关闭。对于(1)，由于库仑势，镜像核中S轨道同位旋多重态之间的异常能量移动被称为托马斯-埃赫曼效应。我们分析了具有中子晕结构的镜像核中S轨道态的能量位移。结果表明，动能约化和库仑能量约化两种机制的结合合理地解释了大的能量转移。至于第(2)项。理论分析给出了在未变形的Li核中，P_&lt；1/2&gt；-S_1/2&gt；态的关闭是由于最重要的配对态(p_&lt；1/2&gt；)^2j=0的泡利阻塞所致。较少