重离子熔合反应的动力学势垒  

Dynamic Potential Barrier in Heavy-ion Fusion Reaction

作　　者：李晓琳[1] 薛毅娴[2] 田俊龙[3] 

机构地区：[1]山西师范大学物理与信息工程学院,山西临汾041004 [2]北京交通大学交通运输学院,北京100044 [3]山西长治学院物理系

出　　处：《山西师范大学学报（自然科学版）》2006年第1期45-52,共8页Journal of Shanxi Normal University(Natural Science Edition)

基　　金：国家自然科学基金资助(10275042;10475054);山西省自然科学基金资助(20021006)

摘　　要：用改进的量子分子动力学模型研究了与入射能量相关的重离子熔合反应86Kr+100Mo的动力学势垒.在库仑势垒附近,随着入射能的降低可以观察到动力学势垒的最低值,这个最低动力学势垒与绝热势垒非常接近;另一方面,动力学势垒随着入射能的增加而升高,最终接近于静态势垒(非绝热势垒).发现颈部的形成和体系的动力学形变是促使动力学势垒降低的主要原因.基于动力学势垒的研究,对于重离子熔合反应的势垒贯穿给出了一种全新的解释.Based on the improved quantum molecular dynamics model, the incident energy dependences of dynamic potential barriers in the entrance channel of fusion reaction are investigated. It is found ＇that the lowest dynamic barrier is obtained which approaches to the adiabatic static barrier with the incident energy decreasing and the dynamic barrier goes up to the diabatic static barrier with increase of the incident energy. A new explaining of tunneling process for the fusion at the incident energy below the static and above the lowest dynamic bartier is presented. In order to understand the energy dependence of the dynamical barrier we also pay a great attention to study the neck formation and shape deformation during the dynamic lowering of the barrier.

关 键 词：量子分子动力学模型 动力学势垒 颈部 

分 类 号：O572.32[理学—粒子物理与原子核物理]