^(84)Rb晕带signature反转的机理

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

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.