摘要
基于修正的同位旋相关的量子分子动力学模型(IQMD),对中高能区重离子碰撞过程中动量相关作用(MDI)、多重碎裂和耗散过程的同位旋效应的作用进行了研究.计算结果显示:在考虑了动量相关作用的情况下,原子核的阻止、核子发射以及中等质量碎片的多重性均大于不考虑动量相关作用时的数值,特别是在相对较高能区,在有动量相关作用时,根据同位旋相关的核子-核子碰撞截面和同位旋无关的核子-核子碰撞截面所得到的计算结果之差,也大于不考虑动量相关作用时的相应取值.这表明:在相对较高的能区,动量相关作用增强了这些物理量对于核子-核子碰撞截面的同位旋效应的敏感性.
Based on an isospin-dependent quantum molecular dynamics model,the role of the momentum dependent interaction(MDI) on the isopspin effects of fragmentations and dissipations in the intermediate energy heavy ion collisions are studied.lt was found that the values of the nuclear stopping,the number of nucleon emissions and the multiplicity of the intermediate mass fragments with MDI are larger than those without MDI. Especially the differences between those quantities with isospin dependent in-medium nucleon-nucleon cross section and those without the isospin independent in-medium nucleon-nucleon cross section (i.e., the isospin effect of in-medium nucleon-nucleon cross section) under MDI are also larger than those differences without MDI in the relative high energy region, which means that the momentum dependent interaction enhances the sensitivities of those quantities to the isospin effect of in-medium nucleon-nucleon cross section at the relative high beam energies.
出处
《高能物理与核物理》
CSCD
北大核心
2002年第z1期63-72,共10页
High Energy Physics and Nuclear Physics
基金
国家重点基金研究发展规划(G2000077407)
中国科学院百人计划
国家自然科学基金(10175080
10004012)
中国科学院知识创新工程重点方向项目(KJCX2-SW-NO2)资助
关键词
同位旋效应
多重碎裂
核子-核子碰撞截面
动量相关作用
isospin effect, fragmentation, nucleon-nucleon cross section, momentum dependent interaction
