Deformation dependence of symmetry energy coefficients of nuclei  

作　　者：MO QiuHong LIU Min CHENG LiChun WANG Ning 

机构地区：[1]Department of Physics, Guangxi Normal University [2]School of Material Science and Engineering, Guilin University of Electronic Technology

出　　处：《Science China(Physics,Mechanics & Astronomy)》2015年第8期33-38,共6页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grants Nos.11275052,11365005 and 11422548)

摘　　要：Based on the semi-classical Thomas-Fermi approximation together with the Skyrme energy-density functional, we study the deformation dependence of symmetry energy coefficients of finite nuclei. The symmetry energy coefficients of nuclei with mass number A = 40, 100, 150, 208 are extracted from two-parameter parabola fitting to the calculated energy per particle. We find that the symmetry energy coefficients decrease with the increase of nuclear quadrupole deformations, which is mainly due to the isospin dependence of the difference between the proton and neutron surface diffuseness. Large deformations of nuclei can cause the change of the symmetry energy coefficient by about 0.5 Me V and the influence of nuclear deformations on the symmetry energy coefficients is more evident for light and intermediate nuclei.Based on the semi-classical Thomas-Fermi approximation together with the Skyrme energy-density functional, we study the de- formation dependence of symmetry energy coefficients of finite nuclei. The symmetry energy coefficients of nuclei with mass number A = 40, 100, 150, 208 are extracted from two-parameter parabola fitting to the calculated energy per particle. We find that the symmetry energy coefficients decrease with the increase of nuclear quadrupole deformations, which is mainly due to the isospin dependence of the difference between the proton and neutron surface diffuseness. Large deformations of nuclei can cause the change of the symmetry energy coefficient by about 0.5 MeV and the influence of nuclear deformations on the symmetry energy coefficients is more evident for light and intermediate nuclei.

关 键 词：symmetry energy Skyrme energy-density functional nuclear deformation THOMAS-FERMI 

分 类 号：O571[理学—粒子物理与原子核物理]