^(76)Ge形变的壳模型分析  

Shell-model Analysis for Deformation of ^(76)Ge

作　　者：金华[1] 

机构地区：[1]上海电机学院数理教学部,上海201306

出　　处：《上海电机学院学报》2017年第5期301-305,共5页Journal of Shanghai Dianji University

基　　金：中国科学院高精度核谱学重点实验室开放课题项目资助;上海电机学院学科建设项目资助(16JCXK02)

摘　　要：在pf_(5/2)g_(9/2)模型空间下,利用壳模型程序MSHELL,基于JUN45有效相互作用对核素76 Ge进行了大规模的壳模型计算。计算较好地再现了实验上观测到的能级和E2跃迁概率。通过对计算的γ带能级分布的分析和对受限的Hartree-Fock方法计算得到的等势能面的考察,发现JUN45有效相互作用给出76 Ge较软的三轴形变特征。这与实验上76 Ge具有刚性三轴形变的分析结果不符,表明现有的JUN45有效相互作用存在一定的缺陷。研究表明,球形壳模型方法适用于中等质量核素形变激发的描述。Large-scale shell-model calculation is performed for nucleus ^(76)Ge with the shell-model code MSHELL using JUN45 effective interaction in the model space of pf_(5/2)g_(9/2) shell.The calculation well reproduces observed experimental levels and E2 transition probabilities.The energy level distribution for the calculatedγband and potential energy surface are studied,and calculated using the constrained Hartree-Fock method.It is found that the JUN45 effective interaction shows the characteristic of soft triaxial deformation in ^(76)Ge.This result does not agree with that of rigid triaxial deformation obtained in experimental studies.Some defects exist in the present JUN45 effective interaction.The paper indicates that the spherical shell-mode method is suitable for description of deformation excitation in medium-mass nuclei.

关 键 词：大规模壳模型计算 JUN45有效相互作用 三轴形变 等势能面 

分 类 号：O571.2[理学—粒子物理与原子核物理]