重离子熔合势垒的动力学模型研究  

Study on Fusion Potential Barrier in Heavy Ion Reactions Based on the Dynamical Model

作　　者：俊龙 吴锡真[1] 李祝霞[1] 王宁[2] 刘福虎[3] 

机构地区：[1]中国原子能科学研究院,北京102431 [2]中国科学院理论物理研究所,北京100080 [3]山西师范大学现代物理研究所,临汾041004

出　　处：《高能物理与核物理》2004年第7期725-732,共8页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金 ( 10 175 0 93 ;10 175 0 89;10 2 3 5 0 3 0;10 2 3 5 0 2 0 );国家重点基础研究发展规划项目 (G2 0 0 0 0 7740 0 )资助~~

摘　　要：在改进的量子分子动力学模型基础上系统地研究了超重核合成中的入射道静态势和动力学势 .从入射道静态势给出了质量不对称度与静态势垒高度以及质量不对称度与接触点驱动势的关系 .动力学势垒高度是能量依赖的 ,随着入射能量的增加而增加 ,最终趋近于密度冻结势垒高度 ;动力学势垒高度随着入射能量的降低而降低 ,它的最低值接近于绝热势垒高度 .在冷熔合反应中 。Based on an improved quantum molecular dynamics model the static and dynamic potential in the entrance channel of synthesis of superheavy nuclei are studied. The dependence of the static potential (and driving potential) on mass-asymmetry is obtained. From this study we find out that the mass-symmetric system seems to be difficult to fuse and the fusing system with the largest driving potential could be the optimal choice of the projectile-target combination. By comparing the static potential barrier with the dynamic one we find that the latter one is lower than former one obviously, and that the dynamical potential barrier is entrance energy dependent. The maximum and minimum of dynamic potential barriers approach to the diabatic (sudden approximation) and the adiabatic static potential barriers, respectively.

关 键 词：量子分子动力学模型 超重元素 入射道静态势 动力学势垒 原子核物理 不对称度 

分 类 号：O562[理学—原子与分子物理]