丰中子锶同位素的投影壳模型研究

Projected Shell Model Studies for Neutron-rich Sr Isotopes

利用考虑跨壳激发的投影壳模型(PSM)方法,研究了质子数Z=38、中子数N=63和64大形变丰中子101,102Sr同位素的结构性质。主要计算了转动谱、转动惯量和电磁跃迁性质等(如B(E2)和g因子),并与相应的实验数据进行系统比较和相关的理论预言。结果表明,PSM可以利用理论计算的能带图解释101,102Sr同位素的转动惯量、电磁跃迁随自旋的变化,分析晕带的结构。PSM理论可以很好地再现实验结果,说明PSM方法及其采用的有效相互作用可以外推研究丰中子核区101,102Sr同位素的原子核结构。对于101,102Sr同位素,核子开始填布质子g9/2和中子h11/2轨道,通过更为仔细地分析能带图中来自质子g9/2和中子h11/2轨道对各转动带的组态成分的贡献,清晰地表明丰中子核结构性质对不同核子填布的依赖。

Recently, we have carried out systematically studies on the structural properties of proton number Z = 38, neutron number N = 63 and 64 neutron-rich isotopes101,102 Sr by using the projected shell model（PSM）with consideration of cross shell excitation. The rotation spectra, the moment of inertia and the electromagnetic transition properties（such as B（E2） and g-factor） are calculated and compared with the corresponding experimental data in this paper. Furthermore, more high spin states are predicted in the calculation and expected to be confirmed experimentally. The results show that the PSM can not only well analyze the structural properties of yrast bands in101,102 Sr but also interpret the variation of the moment of inertia, electromagnetic transition with spins in terms with the theoretical band diagram. The good agreement with the experimental data suggests that the PSM with the adopted effective interactions can be generalized to study the nuclear structure of101,102 Sr isotopes in neutron-rich mass region. For101,102 Sr isotopes, the nucleons begin to fill proton g9/2 and neutron h11/2 orbital, the dependence of nuclear structure and properties on the different orbital occupies is described by carefully analyzing the contribution from proton g9/2 and neutron h11/2 orbital to the configuration of rotational bands in band diagram.