密度分布对原子核阻止同位旋效应的影响  

Influence of Density Distribution on Nuclear Stopping Isospin Effects

作　　者：张凡[1] 郭文军[1] 张霄吉[1] 倪晟[1] 

机构地区：[1]上海理工大学理学院,上海200093

出　　处：《原子核物理评论》2012年第1期21-24,共4页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(10905041);上海市教育委员会科研创新项目(09YZ207)~~

摘　　要：利用同位旋相关的量子分子动力学(IQMD)模型,分析了中能重离子碰撞过程中相对论平均场和Skyrme Hartrere-Fork等核结构模型给出的核密度分布对原子核阻止的影响。研究表明,从费米能到100MeV/u的较大能量范围内,无论小质量体系还是大质量体系,原子核阻止对同位旋相关的核子-核子碰撞截面都非常灵敏,而不同模型给出的核密度分布对原子核阻止影响不大。这说明原子核阻止作为提取同位旋相关核子-核子碰撞截面的灵敏探针是与原子核结构模型无关的。Influence of density distribution which is given by RMF and Skyrme-Hartrere-Fork et al. nuclear structure model on nuclear stopping in heavy-ion collisions at intermediate energies is studied hy using isospin-dependent quantum molecular dynamics （IQMD） model. Research shows that in the range from the Fermi energy to the energy of 100 MeV/u, for both small and large mass system, nuclear stopping is found to be strongly dependent on the nucleon-nucleon cross sections, and weakly on different density distribution . This shows that nuclear stopping can be used as a probe to extract the information on the isospin dependence N-N cross sections and has no relationship with nuclear structure models.

关 键 词：原子核阻止 密度分布 IQMD 

分 类 号：O571.6[理学—粒子物理与原子核物理]