中子晕核的松散结构在重离子碰撞动量耗散中的作用  

Special Role of Neutron-Halo Nucleus on the Momentum Dissipation in Heavy Ion Collisions

作　　者：邢永忠[1] 刘建业[1] 左维[1] 李希国[1] 

机构地区：[1]兰州重离子加速器国家实验室原子核理论中心

出　　处：《高能物理与核物理》2005年第10期978-982,共5页High Energy Physics and Nuclear Physics

基　　金：国家重点基础研究发展计划项目(G2000077400)国家自然科学基金重点项目(10435080)国家自然科学基金(10447006)中国科学院知识创新工程重要方向项目(KJCX2-SW-N02)资助~~

摘　　要：利用同位旋相关量子分子动力学模型,对比和研究了中子晕核19B和相等质量稳定核19F在相同入射道条件下引起核反应动量耗散中的特征.由于中子晕核的松散中子晕结构和小的分离能,与相等质量稳定核相比,在低能区具有减弱动量耗散的特征.但随入射能量的升高,这种晕核结构对动量耗散的作用减弱.而且对所有质量靶核,所有碰撞参数和中子晕核结构都具有减弱动量耗散的作用.The special role of neutron-halo nucleus ^19B on the momentum dissipation was investigated by using isospin dependent quantum molecular dynamics. In order to compare and protrude the special role of neutron-halo-nucleus ^19B, the momentum dissipation induced by a same mass stable nucleus ^19F was investigated under the same incident channel condition. It is found that the weak bound neutron-halo structure of ^19B weakens the momentum dissipation process compared to those induced by stable nucleus ^19F in the lower energy region. However the nuclear stopping of colliding system with the neutron-halo nucleus ^19B decreases gradually with the increasing beam energy. For all of mass targets and impact parameters the neutron-halo nucleus ^19B weakens the momentum dassipation process.

关 键 词：中子晕核 动量耗散 重离子碰撞 晕核结构 晕结构 耗散 动量 中子 松散 量子分子动力学模型 

分 类 号：O571.2[理学—粒子物理与原子核物理]