Density and Symmetric Potential Dependences of Isoscaling Behaviour in the Lattice Gas Model  

作　　者：苏前敏 马余刚 田文栋 方德清 蔡翔舟 王鲲 

机构地区：[1]Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800 [2]Graduate School of the Chinese Academy of Sciences, Beijing 100049 [3]College of Electronic and Electrical Engineering, Shanghai University of Engineering Science, Shanghai 201620

出　　处：《Chinese Physics Letters》2008年第6期2000-2003,共4页中国物理快报（英文版）

基　　金：Supported in part by the National Basic Research Programme of China under Contract No 2007CB815004, the Shanghai Development Foundation for Science and Technology under Grant Nos 06JC14082 and 06QA14062, the National Natural Science Foundation of China under Grant Nos 10535010 and 10775167.

摘　　要：Isoscaling behaviour of the statistical emission fragments from the equilibrated sources with Z = 30 and N = 30, 33, 36 and 39 is investigated in the framework of the isospin-dependent lattice gas model. The dependences of isoscaling parameters α on source isospin asymmetry, temperature and freeze-out density are studied, and the ＇symmetry energy＇ is deduced from isoscaling parameters. The results show that symmetry energy Csym is insensitive to the change of temperature but follows the power-law dependence on the freeze-out density p. The effect of strength of asymmetry of nucleon-nucleon interaction potential on the density dependence of the symmetry energy is discussed.Isoscaling behaviour of the statistical emission fragments from the equilibrated sources with Z = 30 and N = 30, 33, 36 and 39 is investigated in the framework of the isospin-dependent lattice gas model. The dependences of isoscaling parameters α on source isospin asymmetry, temperature and freeze-out density are studied, and the ＇symmetry energy＇ is deduced from isoscaling parameters. The results show that symmetry energy Csym is insensitive to the change of temperature but follows the power-law dependence on the freeze-out density p. The effect of strength of asymmetry of nucleon-nucleon interaction potential on the density dependence of the symmetry energy is discussed.

关 键 词：supernova explosion proto-neutron star shock wave 

分 类 号：O571[理学—粒子物理与原子核物理]