Symmetry energy of neutron-rich fragments in the 140 A MeV 58Ni+9Be projectile fragmentation in the AMD model
作者单位：Institute of Modern PhysicsChinese Academy of Sciences
会议名称：《第十四届全国核结构大会暨第十次全国核结构专题讨论会》
会议日期：2012年
学科分类：08[工学] 0827[工学-核科学与技术] 082701[工学-核能科学与工程]
摘 要：The symmetry energy of neutron-rich nuclei is one of the hottest topics in nuclear physics[1,2].Depending both on temperature and density,the symmetry energy of nuclear matter is still not well defined theoretically,and it is also difficult to be measured *** the cross section of fragments produced in heavy ion reactions,the symmetry energy of neutron-rich nuclei can be extracted in the framework of modified fisher model(MFM)[1].In this report we calculated the fragment yield in the 140 A MeV Ni+Be projectile fragmentation using antisymmetrized molecular dynamics(AMD) model with a statistical decay code, GEMINI as an afterburner[3-5].Isobaric yield ratios in the reaction are analyzed and the symmetry energy coefficients relative to the temperature(a/T) of the emitting source are obtained as a function of mass of the neutron-rich *** extracted a/T of fragments is compared to those of the experimental results[6].