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Study of nuclear deformation by boson models

用玻色子模型研究核变形

基本信息

批准号：
01540231
负责人：
OTSUKA Takaharu
金额：
$ 1.6万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

项目摘要

The following points have been clarified in this research project. (1) The phase transition between spherical and deformed shapes is studied in terms of the sdg boson model, by taking Samarium isotopes. It has been indicated that the phase transition produces a clear effect on M1 excitation strength. This kind of studies have been extended to Polonium, Radium, etc. It has been shown what Pauli effect should appear in E2 transition strength throughout this phase transition. (2) Octupole deformation has been studied in terms of the spdf boson model. (3) Triaxial deformation has been investigated in terms of the sd boson model. The relation between level compression and gamma unstable deformation was studied with analytic expressions for O(6) symmetry.Besides these studies, the structure of odd mass nuclei has been studied in terms of the Interacting Boson-Fermion Model. The moment of inertia of high-spin states has been studied with a simple expression for its variation for even-even nuclei. Superdeformation has been described by introducing an extended model of the Interacting Boson Model. The E2 decay out of superdeformed bands was suggested. Mixed-symmetry states have been invesigated for Ion, Cadmium and Barium isotopes. The relations between chaos and symmetries have been studied in terms of the shell model and the boson model. The nuclear rotation has been discussed from the viewpoint of quantal coupling of proton and neutron bodies.Thus, various aspects of the nuclear collective motion have been studied, providing us with deeper understandings.

本研究项目明确了以下几点。(1)以钐同位素为例，用sdg玻色子模型研究了球形和形变形状之间的相变。结果表明，相变对M1激发强度有明显的影响。这类研究已扩展到钋，镭等，它已被证明泡利效应应该出现在整个E2跃迁强度的相变。(2)用spdf玻色子模型研究了八极形变。(3)用sd玻色子模型研究了三轴形变。本文用O（6）对称性的解析表达式研究了能级压缩与γ不稳定形变的关系，并用相互作用玻色子-费米子模型研究了奇质量核的结构。本文研究了高自旋态转动惯量，给出了高自旋态转动惯量随偶偶核转动惯量变化的简单表达式。超形变是通过引入相互作用玻色子模型的扩展模型来描述的。提出了超形变带的E2衰变。对离子、镉和钡同位素的混合对称态进行了研究。用壳模型和玻色子模型研究了混沌与对称性之间的关系。本文从质子体和中子体的量子耦合的观点讨论了核转动，从而研究了核集体运动的各个方面，使我们对集体运动有了更深的认识。