高K带中的能量Staggering问题

Energy Staggering in the High K Rotational Band*

引入Ｓｔａｇｇｅｒｉｎｇ指数Ｓ（Ｉ）描写λ一刚性和λ一软性核的能谱可清楚地显示其Ｋ＝２带的两类不同的Ｓ（Ｉ）－Ｉ锯齿图，它们可分别用带振动一转动耦合的三轴转子模型和带三体势的ＩＢＭＩ的Ｏ（６）极限或角动量投影形变ＨＦ方法（ＰＤＨＦ）来描述．同时，还对３Ｋ８的高Ｋ带中的Ｓｔａｇｇｅｒｉｎｇ进行了理论预测．分析了质量数１６０Ａ１８４区域中若干原子核的高Ｋ带能谱数据。

Introducing the staggering index S(I) to describe the energy spectra of the λrigid and λ-soft nuclei, it becomes very clear that there are two kinds of energy staggering for which the S(I) -I plots have opposite zigzag behavior. They can be described using the axially asymmebtric rotor model with vibration-rotation coupling and the interaction boson model O(6) limit with three-body potential or the angular momentum projection deformed Hartree-Fock method (PDHF ), respectively. The theoretical predictions for the characteristics of the staggering in high K rotational band are given. Analyzing the experimental data of high K band spectra of the nuclei in the mass range. 160, it is demoastrated that the energy staggering does exist in the high K band. At the same time, some evidences for the shape transition indicated by zigzag phase change of S(I)-I plots are undoubtedly found.