Mg,Si和S同位素链的壳反常

Shell Anomalies of Mg, Si and S Isotopes

采用考虑轴向形变的相对论平均场理论 ,以双中子、双质子分离能隙δ2n δ2p作为壳封闭的特征 ,分析了Mg ,Si和S同位素链的壳封闭和壳反常 ,发现Mg同位素链在N =12 ,16处 ,Si同位素链在N =14 ,S同位素链在N =16处出现明显的壳封闭结构 ,Si同位素链在N =2 8处壳层结构并没有消失 .Mg ,Si和S同位素链在N =2

The shell closure and shell anomalies of Mg, Si and S isotopes are investigated in the framework of relativistic mean-field theory. From two-proton and two-neutron separation gaps, we find that (1) there exist obvious shell effects at N=12, 16 in Mg isotopes, at N=14 in Si isotopes, and at N=16 in S isotopes, (2) the shell structure of Si isotopes at N=28 does not disappear, (3) the shell effects of Mg, Si and S isotopes at 20 are not very obvious.