A-144质量区丰中子八极形变核的壳模型研究

Plenty of nuclear structure properties have been recognized with the great developments of the nuclear theories and experiments. The octupole deformation in nuclei is one of the most interesting ones. Study of such exotic shapes may provide a deep understanding of the symmetry breaking under the reflection in nuclei, which are complicated quantum many-body systems. In the A-144 region, octupole deformation has been well established, and many octupole rotaional bands have been observed by experiments. However, there are very few systematical theoretic researches of the octupole bands in this region. In the present project, we plan to carry out a microscopic research for those experimental octupole bands by using the Reflection Asymmetric Shell Model(RSAM). The intrinsic states and their effects on the octupole bands will be studied in detail. The physics of the parity inversion in the even-even Ba isotopes, and the behavior of the deformation with the proton and neutron numbers will be systematically investigated.The study will improve our unstanding of the nuclear structure, symmetry as well as its broken. This study can also contribute to nuclear astrophysics studies.

随着实验技术的进步和理论研究的深入发展，人们认识到原子核有着极其丰富的核结构特性。原子核的八极形变是其中很重要的一种，对它们进行深入探索和研究，有助于我们更加深入认识原子核这一复杂的量子多体体系。A-144核区原子核具有典型的八极形变，并已积累了相当多的实验数据。然而，对该区系统深入的理论研究，目前相对较少。本项目拟采用反射不对称壳模型理论，对该核区实验八极转动带结构进行系统的微观研究。深入理解八极形变下，丰中子核区奇-A核内禀单粒子能级结构对八极形变带的影响。探讨Ba偶偶同位素八极形变核宇称劈裂反转的物理机制；探讨八极形变特性随中子数和质子数变化的系统行为。研究结果对深入了解原子核结构、对称性及其破缺以及核天体物理研究具有重要的意义。

随着实验技术的进步和理论研究的深入发展，人们认识到原子核有着极其丰富的核结构特性。原子核的八极形变是其中很重要的一种，对它们进行深入探索和研究，有助于我们更加深入认识原子核这一复杂的量子多体体系。本项目内容为用反射不对称壳模型(RASM)研究A-144质量区丰中子八极形变核的微观结构。在该项目的支持下，我们首先对A-144核区八极形变核的单粒子能级进行了探讨，然后结合最新奇-A八极形变核的实验数据，用RASM对奇-A 八极形变核的能谱以及波函数进行了计算与分析，探讨了原子核内禀单粒子能级结构对八极形变带特性的影响，探讨了八极形变宇称双重带的轨道来源。结合最新实验数据对偶偶八极形变核的能谱也进行了计算，对波函数进行了分析，从理论上对偶偶八极形变核中出现的宇称劈裂反转以及影响宇称劈裂反转的一些因素进行了初步的探讨。该项目的完成，进一步扩展了反射不对称壳模型的应用范围，加深了我们对原子核结构的了解。本项目目前共发表期刊论文3篇，均被SCI收录，部分研究成果受到国内外同行专家的高度关注。