多重碎裂的同位旋效应和动量相关作用的影响

利用同位旋相关的量子分子动力学模型,对中能重离子碰撞过程中多重碎裂对于同位旋自由度和动量相关作用的依赖性进行了研究.结果表明:在相对较高能区,碎片的平均多重性敏感地依赖于介质中核子–核子碰撞截面的同位旋效应,但很弱地依赖于对称势;动量相关作用增强了中等质量碎片多重性对于核子–核子碰撞截面的同位旋依赖的敏感性.中等质量碎片的平均多重性可用作提取介质中同位旋相关的核子–核子碰撞截面的探针.

Isospin Effects on Fragmentation Process and Role of Momentum Dependent Interaction in Heavy Ion Collisions at Intermediate Energy

The isospin effects on the fragmentation process and the role of momentum dependent interaction in heavy ion collisions at intermediate energy are studied systematically by using isospin dependent Quantum Molecular Dynamical model (IQMD). The results show that multiplicity of intermediate mass fragments b averaged over all impact parameters depends on the isospin effects of in-medium nucleon-nucleon cross section strongly but on the symmetry potential weakly. The momentum dependent interaction enhances the sensitivity of N imf to the isospin effects of in-medium nucleon-nucleon cross section. Therefore, b can be used as a probe to extract the information of in-medium isospin-dependent nucleon-nucleon cross section in heavy ion collisions at intermediate energy.==