A≈80区奇-奇核^(80,82)Rb的晕带能谱计算

Calculation of Yrast Bands for Odd-Odd Nuclei ^(80,82)Rb in A≈80 Mass Region

在A≈ 80区奇 -奇核旋称反转问题上已提出几种机制 ,但没有一种理论推断是结论性的 .在本工作中将角动量投影壳模型应用到 80 ,82 Rb核 ,对组态为πg9 2 νg9 2 的正宇称晕带和组态为π(p1 2 ,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反转机制进行了探讨 .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变到高自旋的扁椭球 .此外 。

Several mechanisms have been proposed for the signature inversion in the structure of A≈80 odd-odd nuclei, but the theoretical calculations have not been conclusive. In this work, the angular momentum projected shell model (PSM) is applied to the nuclei 80,82Rb. 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 1/2 or p 3/2 or f 5/2)νg 9/2 are compared with experimental data, especially, the mechanism of the signature inversion in the positive-parity yrast band is discussed. The interpretation within the projected shell model shows that the signature inversion displayed in the positive-parity yrast band in these nuclei is a signal of a substantial quadrupole shape change with increasing spin where the nucleus evolves from a prolate shape at low spin through a triaxial shape to an oblate shape at high spin. In addition, we also specify the nuclear shape for these two bands in these two unclei, respectively.