The nuclear symmetry energy from relativistic Brueckner-Hartree-Fock model  

作　　者：Chen can Wang Jinniu Hu Ying Zhang Hong Shen 王宸璨;胡金牛;张颖;申虹(School of Physics,Nankai University,Tianjin 300071,China;Department of Physics,Faculty of Science,Tianjin University,Tianjin 300072,China)

机构地区：[1]School of Physics,Nankai University,Tianjin 300071,China [2]Department of Physics,Faculty of Science,Tianjin University,Tianjin 300072,China

出　　处：《Chinese Physics C》2022年第6期203-211,共9页中国物理C（英文版）

基　　金：Supported by in part by the National Natural Science Foundation of China(11775119,12175109);the Natural Science Foundation of Tianjin。

摘　　要：The microscopic mechanisms of the symmetry energy in nuclear matter are investigated in the framework of the relativistic Brueckner-Hartree-Fock(RBHF)model with a high-precision realistic nuclear potential,pvCDBonn A.The kinetic energy and potential contributions to symmetry energy are decomposed.They are explicitly expressed by the nucleon self-energies,which are obtained through projecting the G-matrices from the RBHF model into the terms of Lorentz covariants.The nuclear medium effects on the nucleon self-energy and nucleon-nucleon interaction in symmetry energy are discussed by comparing the results from the RBHF model and those from Hartree-Fock and relativistic Hartree-Fock models.It is found that the nucleon self-energy including the nuclear medium effect on the single-nucleon wave function provides a largely positive contribution to the symmetry energy,while the nuclear medium effect on the nucleon-nucleon interaction,i.e.,the effective G-matrices provides a negative contribution.The tensor force plays an essential role in the symmetry energy around the density.The scalar and vector covariant amplitudes of nucleon-nucleon interaction dominate the potential component of the symmetry energy.Furthermore,the isoscalar and isovector terms in the optical potential are extracted from the RBHF model.The isoscalar part is consistent with the results from the analysis of global optical potential,while the isovector one has obvious differences at higher incident energy due to the relativistic effect.

关 键 词：RBHF model nuclear matter symmetry energy 

分 类 号：O571[理学—粒子物理与原子核物理]