Symmetry energy and experimentally observed cold fragments in intermediate heavy-ion collisions  

作　　者：张苏雅拉吐 黄美容 R.Wada 刘星泉 林炜平 王建松 

机构地区：[1]College of Physics and Electronics Information,Inner Mongolia University for Nationalities [2]Cyclotron Institute,Texas A&M University,College Station [3]Institute of Modern Physics,Chinese Academy of Sciences

出　　处：《Chinese Physics C》2017年第4期50-55,共6页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China(U1432247,11605097);National Basic Research Program of China(973Program,2014CB845405);Doctoral Scientific Research Foundation of Inner Mongolia University for the Nationalities(BS365)

摘　　要：An attempt is made to study the symmetry energy at the time of primary fragment formation from the experimentally observed cold fragments for a neutron-rich system of ^64Ni ＋ ^9Be at 140 MeV/nucleon,utilizing the recent finding that the excitation energy becomes lower for more neutron-rich isotopes with a given Z value.The extracted α（sym）/T values from the cold fragments,based on the Modified Fisher Model（MFM）,are compared to those from the primary fragments of the antisymmetrized molecular dynamics（AMD） simulation and become consistent with the simulation when the I = N —Z value becomes larger,indicating that the excitation energy of these neutron-rich isotopes is indeed lower.An attempt is made to study the symmetry energy at the time of primary fragment formation from the experimentally observed cold fragments for a neutron-rich system of ^64Ni ＋ ^9Be at 140 MeV/nucleon,utilizing the recent finding that the excitation energy becomes lower for more neutron-rich isotopes with a given Z value.The extracted α（sym）/T values from the cold fragments,based on the Modified Fisher Model（MFM）,are compared to those from the primary fragments of the antisymmetrized molecular dynamics（AMD） simulation and become consistent with the simulation when the I = N —Z value becomes larger,indicating that the excitation energy of these neutron-rich isotopes is indeed lower.

关 键 词：symmetry energy modified Fisher model antisymmetrized molecular dynamics simulations 

分 类 号：O571.6[理学—粒子物理与原子核物理]