摘要
利用同位旋相关的量子分子动力学模型研究了中能重离子碰撞过程中 ,同位旋相关的核子碰撞截面的介质修正对于多重碎裂的影响 .结果表明 :在包括动量相关作用在内的软势的情况下 ,介质修正明显地提高了自由核子的发射和中等质量碎片的多重性对于核子碰撞截面的同位旋依赖的敏感性 .但对于原子核阻止敏感地依赖于核子碰撞截面的同位旋效应而不敏感地依赖于对称势的形式这一性质的影响并不明显 ,因此 。
The influence of medium correction of isospin dependent nucleon nucleon (NN) cross section on fragmentation in heavy ion collisions at intermediate energies is studied by using the isospin dependent quantum molecular dynamical model. The results show that the medium correction of isospin dependent nucleon nucleon cross section enhances the sensitivity of the free nucleons emission and multiplicity of intermediate mass fragments on the isospin effects of NN cross section. The character of nuclear stopping that depends strongly on the isospin effect of NN cross section and weakly on the different forms of symmetry potential is not affected by the medium correction of NN cross section.And hence this charater of nuclear stopping stems mainly from the isospin effects of free nucleon nucleon cross section.
出处
《高能物理与核物理》
CSCD
北大核心
2003年第5期421-425,共5页
High Energy Physics and Nuclear Physics
基金
国家重点基础研究发展规划 (G2 0 0 0 0 7740 7)
国家自然科学基金 ( 10 175 0 80
10 0 0 40 12 )
中国科学院百人计划和中国科学院知识创新工程重点方向性项目 (KJCX2 -SW -N0 2 )资助~~
