Isoscaling in Statistical Sequential Decay Model  

作　　者：田文栋 马余刚 蔡翔舟 方德清 郭威 马春旺 刘贵华 沈文庆 石钰 苏前敏 王宏伟 王鲲 颜廷志 

机构地区：[1]Shanghai Institute of Applied Physics, Chinese Academy of Sciences, P.O. Box 800-204, Shanghai 201800 [2]School of the Chinese Academy of Sciences, Beijing 100049

出　　处：《Chinese Physics Letters》2007年第2期385-388,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 10405033, 10405032, 10505026 and 10135030, the Shanghai Development Foundation for Science and Technology under Grant Nos 05XD14021 and 03QA14066, and the Major State Basic Research Programme under Contract No G200077404.

摘　　要：A sequential decay model is used to study isoscaling, i.e. the factorization of the isotope ratios from sources of different isospins and sizes over a broad range of excitation energies, into fugacity terms of proton and neutron number, R21（N, Z） = Y2（ N, Z）/Y1（ N, Z） = Cexp（αN -βZ）. It is found that the isoscaling parameters α and β have a strong dependence on the isospin difference of equilibrated source and excitation energy, no significant influence of the source size on α andβ has been observed. It is found that α and β decrease with the excitation energy and are linear functions of 1/T and △（Z/A）2 or△（N/A）2 of the sources. Symmetry energy coefticient Gsym is constrained from the relationship of a and source △（Z/A）2, /3 and source △（N/A）2.A sequential decay model is used to study isoscaling, i.e. the factorization of the isotope ratios from sources of different isospins and sizes over a broad range of excitation energies, into fugacity terms of proton and neutron number, R21（N, Z） = Y2（ N, Z）/Y1（ N, Z） = Cexp（αN -βZ）. It is found that the isoscaling parameters α and β have a strong dependence on the isospin difference of equilibrated source and excitation energy, no significant influence of the source size on α andβ has been observed. It is found that α and β decrease with the excitation energy and are linear functions of 1/T and △（Z/A）2 or△（N/A）2 of the sources. Symmetry energy coefticient Gsym is constrained from the relationship of a and source △（Z/A）2, /3 and source △（N/A）2.

关 键 词：FRAGMENTS EMISSION DYNAMICS COLLISIONS ENERGIES FISSION NUCLEI 

分 类 号：O57[理学—粒子物理与原子核物理]