Isospin Dependence of Nucleon-Nucleon Cross-Section in Heavy Ion Reactions

Abstract

The rapid progress in producing energetic radioactive beams has offered an excellent opportunity to investigate various isospin effects in the dynamics of nuclear reaction. This study has made it possible to obtain crucial information about the equation of state of isospin asymmetric nuclear matter and the isospin dependent in-medium nucleon nucleon cross-section. Recently, several interesting isospin effects in heavy ion collisions have been explored both experimentally and theoretically. Based on an isospin dependent quantum molecular dynamics model (IQMD), we studied the underlying influence of the isospin effect of nucleon nucleon cross section on the fragmentation, elliptical flow and stopping at intermediate energy heavy-ion collisions. We found the pronounced isospin effects in the nuclear stopping, the multiplicity of intermediate mass fragments and elliptical flow due to mainly the isospin dependent nucleon-nucleon cross-section.