Study of Pre-equilibrium Fission Based on Diffusion Model

以 Smoluchowski 方程的数字方法，在散开模型的分裂过程的行为被描述了并且分析，包括在时间，以及在在这篇论文的几原子温度的变丑参数之上的信赖。在僵绳点内的分裂率和剩余可能性为可分裂的原子核 n+~(238 ) 被计算 Ureaction 和不可分裂的原子核 p+~(208 ) Pb 反应。结果显示那确实在那里存在短暂分裂处理，它意味着平衡前分裂应该在高温度为可分裂的原子核被考虑。相对地，平衡前分裂能为不可分裂的原子核被忽视。在某些盒子中， Sssion 率的射的现象将发生，它由在僵绳点的散开的水流主要是坚定的。温度越高，射的现象越明显。然而，伴随散开过程的轻粒子的排出物可以变弱或消失射的现象。

In terms of numerical method of Smoluchowski equation the behavior of fission process in diffusion model has been described and analyzed, including the reliance upon time, as well as the deformation parameters at several nuclear temperatures in this paper. The fission rates and the residual probabilities inside the saddle point are calculated for fissile nucleus n＋^238U reaction and un-fissile nucleus p＋^208Pb reaction. The results indicate that there really exists a transient fission process, which means that the pre-equillbrium fission should be taken into account for the fissile nucleus at the high temperature. Oppositely, the pre-equilibrlum fission could be neglected for the un-fissile nucleus. In the certain case the overshooting phenomenon of the fission rates will occur, which is mainly determined by the diffusive current at the saddle point. The higher the temperature is, the more obvious the overshooting phenomenon is. However, the emissions of the light particles accompanying the diffusion process may weaken or vanish the overshooting phenomenon.