中能Abrasion-Ablation模型的核内核子密度分布修正  

Correction of Abrasion-Ablation Model of Intermediate Energy with Distributions of Nucleon Density in Nucleus

作　　者：胡佩钢[1] 吴和宇[1] 靳根明[1] 李祖玉[1] 贺智勇 符彦飚 王宏伟[1] 段利敏[1] 张保国[1] 戴光曦[1] 

机构地区：[1]中国科学院近代物理研究所,兰州730000

出　　处：《高能物理与核物理》2000年第7期662-666,共5页High Energy Physics and Nuclear Physics

基　　金：甘肃省自然科学基金 ;中国科学院"九五"基础性研究重大科学基金 !(KJ95T - 0 3);"百人计划"基金

摘　　要：将具体的核内核子 (包括中子、质子 )密度分布引入到中能Abrasion -Ab lation模型中 ,用修正后的模型计算了 30MeV/u　 4 0 Ar +natAg反应中的弹核碎裂过程 .结果表明 ,在非常周边的碰撞中 ,修正后的模型计算的碎片截面与修正前的计算相比有明显的差别 ,反映了核密度边缘弥散的影响 .与实验结果的比较验证了中能弹核碎裂碎片能量相对于束流能量的降低是由摩擦作用引起的 .Nucleon density distributions in nucleus (including neutron and proton)have been introduced into the Abrasion-Ablation model for the intermediate energy collision.Process of projectile fragmentation in the reaction of 30MeV/u 40 Ar+ nat Ag has been simulated with the model of corrected version. The results show that in the rather peripheral collisions there are obvious differences for the calculated cross sections with and without correction of nucleon density distributions in the model.The differences come from the effects of dispersion on the edge of nuclei. It has been verified by comparison with experimental results that reduction of mean energy of projectile-like fragments from beam energy is mainly caused by the action of friction.

关 键 词：Abrasion-Ablation模型 核子密度分布 弹核碎裂 

分 类 号：O571.6[理学—粒子物理与原子核物理]