^(84)Rb晕带signature反转的机理  

On the mechanism of signature inversion in the yrast band of ^(84) Rb

作　　者：沈水法[1] 石双惠[1] 顾嘉辉[1] 刘静怡[1] 沈文庆[1] 

机构地区：[1]中国科学院上海原子核研究所,上海201800

出　　处：《物理学报》2003年第1期48-52,共5页Acta Physica Sinica

基　　金：国家重点基础研究发展规划 (批准号 :TG2 0 0 0 0 7740 4);上海市自然科学基金 (批准号 :0 0ZA14 0 78)资助的课题~~

摘　　要：将角动量投影壳模型应用到84 Rb核 ,对组态为πg9 2 νg9 2 的正宇称晕带和组态为π(p3 2 ,f5 2 ) νg9 2 的负宇称晕带理论计算和实验结果进行了比较 ,特别是对正宇称晕带中的signature反转机理进行了探讨 .角动量投影壳模型计算显示正宇称晕带中的signature反转是原子核随自旋增加形状发生变化的信号 ,其间原子核从低自旋的长椭球通过三轴形变变到高自旋的扁椭球 .此外 ,还确定了此两带的原子核形状 .The angular momentum projected shell model(PSM) is applied to the nucleus 84 Rb. The results of theoretical calculations about the positive parity yrast band with configuration πg 9/2 νg 9/2 and the negative parity yrast band with configuration π(p 3/2 ,f 5/2 )νg 9/2 are compared with experimental data;especially,the mechanism of signature inversion in the positive parity yrast band is discussed.The interpretation within the PSM shows that this signature pattern is a signal of a substantial quadrupole shape change with increasing spin,where the nucleus evolves from a prolate shape at low spins through a triaxial shape to an oblate shape at high spins.In addition,the nuclear shape for these two bands are also specified.

关 键 词：^84Rb 角动量投影壳模型 晕带 SIGNATURE反转 反转机理 铷原子 原子核 高自旋态 

分 类 号：O571.2[理学—粒子物理与原子核物理]