中子晕核结构在引起核碎裂中的特殊作用  

Special Role of Neutron-Halo Structure in the Fragmentation Reactions

作　　者：刘建业[1] 郭文军[2] 任中洲[2] 邢永忠[3] 左维[1] 李希国[1] 

机构地区：[1]中国科学院近代物理研究所,兰州730000 [2]南京大学物理系,南京210008 [3]天水师范学院数理信息学院基础物理研究所

出　　处：《高能物理与核物理》2005年第8期761-765,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(G2000077400);国家重点自然科学基金(10435080);国家自然科学基金(10477006;10125521;10447113);中国科学院知识创新工程重要方向项目(KJCX2SWN02);江苏省博士后科研计划项目资助~~

摘　　要：基于同位旋相关量子分子动力学模型,研究和对比分析了中子晕核11Li和相等质量稳定核11B在相同入射道条件下引起核碎裂反应中的特征.由于中子晕核松散的晕中子结构和小的分离能与相等质量稳定核相比具有容易碎裂的特征,因此在较低能区这种松散的晕结构有利于碎裂过程的发生,随入射能量升高,这种晕结构效应逐渐消失.而且这种在碎裂中的中子晕结构作用随靶核质量和碰撞参数的增加而减弱.Based on the quantum molecular dynamics model the special role of neutron-halo structure in the fragmentation reactions was studied. In order to compare and emphasize the special role of neutron halo structure ^11Li in the fragmentation reactions we also studied the fragmentation reactions induced by the stable nucleus ^11B with the same mass and the same incident channel condition. We found that the special neutron-halo structure of ^11Li is of benefit to the fragmentation reactions in the lower energy region, compared to that induced by stable nucleus ^11B. However the beneficial role of neutron-halo ^11Li on the fragmentation reactions decreases till to be canceled with the increase of beam energy. The beneficial role of neutron-halo ^11Li on the fragmention reactions also decreases with increasing target mass and impact parameter.

关 键 词：中子晕核 碎裂反应 量子分子动力学 同位旋 碰撞参数 

分 类 号：O571.2[理学—粒子物理与原子核物理]