Weighted variation after projection method for low-lying nonyrast states  

作　　者：连占江 陆晓 李雪薇 高早春 陈永寿 Zhan-Jiang Lian;Xiao Lu;Xue-Wei Li;Zao-Chun Gao;Yong-Shou Chen(China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]China Institute of Atomic Energy,Beijing 102413,China

出　　处：《Chinese Physics C》2023年第7期89-95,共7页中国物理C（英文版）

基　　金：Supported by the National Natural Science Foundation of China(11975314);the Key Laboratory of Nuclear Data foundation(JCKY2022201C158);the Continuous Basic Scientific Research Project(WDJC-2019-13,BJ20002501)

摘　　要：We propose a simple algorithm to further improve the previous variation after projection(VAP)wave functions for low-lying nonyrast states.We attach a weight factor to each calculated energy;then,the sum of these weighted energies is minimized.It turns out that a low-lying nonyrast VAP wave function can be further optimized when the weight factor for the corresponding energy is far larger than the other ones.Based on the improved WVAP wave functions,the energy-variance extrapolation method is applied to estimate the exact shell model energies.The calculated results for nuclei in the sd and pf model spaces clearly show that the extrapolated energies for all the calculated states are very close to the exact shell model ones within 10 keV.

关 键 词：variation after projection energy-variance extrapolation shell model 

分 类 号：O571[理学—粒子物理与原子核物理]