用修正的擦碎模型研究碎裂反应的同位素分布  

Study on Isotopic Distribution Produced by Nucleus-Nucleus Collisions with Modified SAA Model

作　　者：钟晨[1] 方德清[1] 蔡翔舟[1] 沈文庆[1] 张虎勇[1] 魏义彬[1] 马余刚[1] 

机构地区：[1]中国科学院上海原子核研究所,上海201800

出　　处：《高能物理与核物理》2003年第1期39-43,共5页High Energy Physics and Nuclear Physics

基　　金：国家重点基础研究发展规划项目(G2000077402)资助~~

摘　　要：对统计擦碎模型(SAA)的计算方法进行修正和优化,并引入参数化的介质中核子-核子碰撞截面和核物质密度分布弥散度,可很好符合从中能到高能下碎裂反应产生同位素分布的实验截面,并能计算和拟合远离峰位、很低截面的同位素分布.Base on Brohm's Statistic-Ablation-Abrasion (SAA) model, the modified SAA model was developed via introducing the isospin dependence of nucleon distribution in nucleus and parameterized formulas for nucleon-nucleon cross section in nuclear matter. It can simulate well the isotopic distribution at both high and intermediate energies. By the improvement of computational method, the range of calculation of isotopic distribution can be increased from three order magnitude to eight order magnitude (even higher) . It can reproduce experimental data and predict the isotopic distribution for very far from stability line which is very important from experimental viewpoint.

关 键 词：修正 同位素分布 统计擦碎模型 碎裂反应 SAA 计算方法 优化 高能重离子反应 

分 类 号：O572.21[理学—粒子物理与原子核物理]