Exploring nuclear symmetry energy with isospin dependence in neutron skin thickness of nuclei  

作　　者：刘敏 李祝霞 王宇 张丰收 

机构地区：[1]College of Nuclear Science and Technology, Beijing Normal University [2]Department of Physics, Guangxi Normal University [3]China Institute of Atomic Energy [4]Beijing Radiation Center

出　　处：《Chinese Physics C》2011年第7期629-634,共6页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (10875031, 10847004, 10675172);Doctoral Station Foundation ofMinistry of Education of China (200800270017);National Basic Research Program of China (2007CB209900, 2010CB832903)

摘　　要：We propose an alternative way to constrain the density dependence of the symmetry energy from the neutron skin thickness of nuclei which shows a linear relation to both the isospin asymmetry and the nuclear charge with a form of Z2/3. The relation of the neutron skin thickness to the nuclear charge and isospin asymmetry is systematically studied with the data from antiprotonic atom measurement, and with the extended Thomas-Fermi approach incorporating the Skyrme energy density functional. An obviously linear relationship between the slope parameter L of the nuclear symmetry energy and the isospin asymmetry dependent parameter of the neutron skin thickness can be found, by adopting 70 Skyrme interactions in the calculations. Combining the available experimental data, the constraint of -20 MeV 〈～ L 〈～ 82 MeV on the slope parameter of the symmetry energy is obtained. The Skyrme interactions satisfying the constraint are selected.We propose an alternative way to constrain the density dependence of the symmetry energy from the neutron skin thickness of nuclei which shows a linear relation to both the isospin asymmetry and the nuclear charge with a form of Z2/3. The relation of the neutron skin thickness to the nuclear charge and isospin asymmetry is systematically studied with the data from antiprotonic atom measurement, and with the extended Thomas-Fermi approach incorporating the Skyrme energy density functional. An obviously linear relationship between the slope parameter L of the nuclear symmetry energy and the isospin asymmetry dependent parameter of the neutron skin thickness can be found, by adopting 70 Skyrme interactions in the calculations. Combining the available experimental data, the constraint of -20 MeV 〈～ L 〈～ 82 MeV on the slope parameter of the symmetry energy is obtained. The Skyrme interactions satisfying the constraint are selected.

关 键 词：nuclear symmetry energy neutron skin thickness isospin asymmetry nuclear charge 

分 类 号：O571.5[理学—粒子物理与原子核物理]