时间反演不对称投影后变分方法  

The VAP calculations with time-odd Hartree-Fock mean field in nuclear many body theory

作　　者：图雅[1] 何艳[1] 高早春[2] 陈永寿[2] 田永威 TU Ya HE Yan GAO Zaochun CHEN Yongshou TIAN Yongwei(College of Physics Science and Technology, Shenyang Normal University, Shenyang 110034, China China Institute of Atomic Energy, Beijing 102413, China)

机构地区：[1]沈阳师范大学物理科学与技术学院,沈阳110034 [2]中国原子能科学研究院,北京102413

出　　处：《沈阳师范大学学报（自然科学版）》2017年第2期156-160,共5页Journal of Shenyang Normal University:Natural Science Edition

基　　金：国家自然科学基金青年科学基金资助项目(11305108);国家自然科学基金理论物理专款项目(11047171)

摘　　要：在HF(Hartree-Fock)平均场的基础上,建立了新的投影后变分方法(Variation after projection即VAP方法)。由于算法中考虑了HF平均场的时间反演对称性破缺,使得新的VAP方法能够很自然地推广到偶偶核的奇自旋态,以及奇奇核和奇-A核的所有晕态计算中。采用这种新的VAP方法,初步计算了sd-壳原子核^(24) Mg,^(25) Mg,^(26) Mg和^(26) Al的晕带,并将其与壳模型(Shell Model,SM)给出的准确值进行比较,结果发现二者非常接近。这表明VAP方法是一种非常有效的壳模型近似方法。同时,根据计算结果,分析认为角动量投影在获得良好的壳模型近似中起到了关键的作用。We have implemented a new variation after projection（VAP）calculation based on the Hartree-Fock（HF）mean field.Due to the time reversal symmetry breaking of the mean field,the present VAP can be naturally extended to the yrast states in odd-A and odd-odd nuclei as well as the yrast states in the even-even nuclei.With the new VAP code,we calculated the yrast states in 24 Mg,25 Mg,26 Mg and 26 Al.All the calculated VAP energies are very close to the Shell Model（SM）ones.This clearly shows that the spin projection is very important in achieving agood approximation to the full shell model.

关 键 词：超越平均场 投影后变分 原子核结构 

分 类 号：O571.21[理学—粒子物理与原子核物理]