基于双核模型对超重元素合成机制的研究

Study of the mechanism for synthesizing superheavy nuclei based on dinuclear system

在双核模型基础上,考虑了熔合与准裂变的竞争,通过数值法求解主方程,计算了50Ti,58Fe+208Pb,209Bi这4个反应系统通过冷熔合反应合成超重元素的激发函数,得到了与实验比较符合的结果.计算了不同入射能量时各角动量分波对熔合概率和超重核存活概率的影响以及对蒸发剩余截面的贡献.这些结果对进一步理解超重核的合成机制有重要意义.

Based on the concept of dinuclear system,considering the strong competition between fusion and quasiffision processes,by solving the master equation numerically to calculate the fusion probability of superheavy nuclei,we have estimated the excitation functions for the reactions ^50Ti,^58Fe＋ ^208Pb,^209Bi,and the experimental data are basically reproduced.For different incident energies and different angular momentum,the effects on fusion and survival probability and the contribution to evaporationresidue cross section have been given. These results help to further understand the mechanism for synthesizing superheavy nuclei.