基于非对称粒子空穴组态的手征双重带  

Chiral Doublet Bands in Nuclei with Asymmetric Particle-Hole Configuration

作　　者：张双全[1] 彭婧[1] 孟杰[1] 

机构地区：[1]北京大学物理学院技术物理系,北京100871

出　　处：《高能物理与核物理》2004年第2期161-166,共6页High Energy Physics and Nuclear Physics

基　　金：国家重点基础研究发展规划项目 (G2 0 0 0 0 740 7);国家自然科学基金 ( 10 0 2 5 5 2 2;10 0 470 0 1;10 2 2 10 0 3 1993 5 0 3 0 )资助~~

摘　　要：利用三轴形变的粒子转子模型对基于非对称粒子空穴组态πg-19 2 νh11 2 和πh-111 2 νi13 2 等的手征双重带进行了研究 .详细分析了转动能谱、角动量随转动频率的变化关系、以及约化跃迁几率B(E2 )和B(M1)等性质 .发现基于非对称组态的三轴形变原子核也有类似对称组态的手征双重带现象 .但它们所对应的最佳三轴形变值从γ =30°变为γ～ 2 7° .随着组态中价核子角动量的增加 ,出现手征双重带的自旋随之增加 。Based on the triaxial particle-rotor model (PRM), the chiral doublet bands with symmetric particle-hole configurations πg 9/2νg -1 9/2, πh 11/2νh -1 11/2 and asymmetric configurations πg -1 9/2νh 11/2, πh -1 11/2νi 13/2 have been investigated, including their rotation spectra, the relations between spin and rotational frequency, and the reduced B(E2), B(M1) transition probabilities. These configurations correspond to regions A～100, A～130 and A～170 in nuclear chart respectively. It is observed that the larger angular momentum provided by the valence nucleons, the higher the spin corresponding to the appearance of the chiral doublet bands, and the broader their spin interval. The chiral bands based on asymmetric configurations exhibit quite similar properties as those on symmetric ones, and can be discovered in future in-beam γ experiments.

关 键 词：手征双重带 单粒子组态 能谱 约化跃迁几率 原子核物理学 转动频率 粒子-转子模型 

分 类 号：O582[理学—物理]