156Gd基态SU(3)→O(6)相变的一种微观理解

原子核物理评论 , 2010, 27(3): 257-262.

156Gd基态SU(3)→O(6)相变的一种微观理解

雷玉玺 ^1, , 张欢 ^2, , 石筑一 ^3, , 汪红 ^4, , 童红 ^5,

1.北方民族大学基础部,宁夏,银川,750021

2.北方民族大学基础部,宁夏,银川,750021

3.北方民族大学基础部,宁夏,银川,750021;贵州民族学院物理系,贵州,贵阳,550025

4.贵州民族学院物理系,贵州,贵阳,550025

5.贵州民族学院物理系,贵州,贵阳,550025

基金项目: 贵州省科学技术基金([2009]2071号) 贵州省教育厅自然科学重点项目(2006318)

关键词：量子相变 , 基态结构演化 , 微观sdIBM-(F)max方案 , 156Gd核

Recognition of SU(3)→O(6)Quantum Phase Transition in Ground-states of 156Gd Nucleus within Microscopic Theory

γ射线能量自旋曲线指认156Gd核基态具有SU(3)和O(6)两种对称性.基于微观sdIBM-(F)max方案和单粒子能量实验值,用两组核子之间的对作用、四极对作用、四极-四极作用的等效强度参数,都很好地再现了这两种能谱及其演化过程.计算结果揭示出对基态相变的一种新理解:SU(3)的基准态是低激发-低有序态,而O(6)基准态则是高激发-高有序的,它们有临界区6+1-8+1态;当核退耦到临界区时,高有序基准态释放多余的有序结构能,导致低有序基准态重组,实现减速旋转驱动高有序核向着低有序核过渡的量子相变.最后用156Gd核的势能曲面作了直观说明.

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156Gd基态SU(3)→O(6)相变的一种微观理解

Recognition of SU(3)→O(6)Quantum Phase Transition in Ground-states of 156Gd Nucleus within Microscopic Theory

参考文献