Application of extended random-phase approximation with ground-state correlations to collective excitations of 16O

17th International Conference on Recent Progress in Many-Body Theories

Tohyama, M.^1

Kyorin University School of Medicine, Mitaka, Tokyo 181-8611, Japan^1

关键词: Collective excitations;    Density matrix;    Ground-state correlation;    Hole configuration;    Random phase approximations;    Single particle state;    Time-dependent density matrix;    Two particles;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/529/1/012026/pdf
DOI  :  10.1088/1742-6596/529/1/012026

来源: IOP

【 摘 要 】

The ground-state correlation effects on the octupole excitation of16O are studied using the extended random phase approximation (ERPA) derived from the time-dependent density-matrix theory. ERPA includes the effects of ground-state correlations through the fractional occupation of single-particle states and a correlated two-body density matrix. The coupling to two particle-two hole configurations is also included in ERPA. It is found that the first 3-state calculated in the random phase approximation (RPA) is shifted upward when the self-energy contributions due to ground-state correlations are included in particle-hole pairs and that the coupling to two particle-two hole states plays a role in shifting the first 3-state down to the right position.