超重核合成的同位素依赖探讨

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 e vaporation residue for the 54Fe+204Pb， 56Fe+206Pb， 58Fe+208Pb cold fusion and 32,34, 36S+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.

On Isotope Dependence of Superheavy Nucleus Production

The cross sections of the compound nucleus formation and evaporation residue for the ~(54)Fe (~(204)Pb,) ~(56)Fe ~(206)Pb,~(58)Fe ~(208)Pb cold fusion and ~(32,34,36)S ~(238)U 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.