超重核合成的同位素依赖探讨  

On Isotope Dependence of Superheavy Nucleus Production

作　　者：刘祖华[1] 包景东[2] 

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 [2]北京师范大学物理系,北京100875

出　　处：《原子核物理评论》2006年第4期419-423,共5页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(10235020;10235030)~~

摘　　要：利用二参量Smoluchowski方程计算了54Fe+204Pb,56Fe+206Pb,58Fe+208Pb冷熔合和32,34,36S+238U热熔合的复合核形成截面和蒸发残余截面,结果清楚地显示出超重核合成截面随同位素的变化。由于较低的入射道库仑位垒、较低的不对称裂变谷中的条件鞍点和较小的中子分离能,一般地说,丰中子同位素的超重核形成截面明显增强。The cross sections of the compound nucleus formation and evaporation residue for the ^54 Fe ＋ 204 Pb, 56Fe＋206 Pb, 58Fe＋206 Pb cold fusion and 32.34, 36 S＋238U hot fusion have been calculated by using a two-parameter Smoluchowski equation. Our results clearly show the isotope dependence of superheavy nucleus production. The formation cross sections of the neutron-rich isotope are, generally speaking, obviously enhanced due to the lower Coloumb barrier , lower height of the conditional saddle-point, and smaller neutron separation energy.

关 键 词：SMOLUCHOWSKI方程 超重核 同位素依赖 

分 类 号：O571.6[理学—粒子物理与原子核物理]