低激发能情况下锕系核结构效应对裂变产物质量分布的影响

锕系核裂变产物质量分布的研究，对核能的利用、裂变模型的完善具有重要意义。本项目以低激发能情况下的锕系核二分裂变为研究对象，发展定量描述裂变产物质量分布的统计模型。该模型假设初始碎片是由裂变核发生多种途径两体崩裂反应的产物，借鉴核反应理论中的细致平衡原理，研究两体崩裂反应几率与初始碎片对的约化质量、两碎片对总动能、生成两碎片对的逆截面及两碎片对的断点组态数等之间的关联。同时，基于协变密度泛函理论及双核系统思想，研究锕系核的势能曲面及不同碎片对的量子贯穿几率大小对逆截面的影响。另外，通过两碎片对的能级密度折叠积分研究裂变核断裂为不同碎片对的组态数目，从而进一步了解锕系核的结构效应对裂变产物质量分布的影响。

It is very helpfull for further improving the nuclear energy utilization and the fission models that the study of the fission product mass distirbutions for actinide nuclear. For binary fission at low excited energies, the statistical model which can quantitatively describe the fission product mass distributions will be developed. In this model, the primary fission fragment pairs are assumed as the products through multi-channel two-body breakup process. We will study the dependences of the two-body breakup probabilities at scission for the different complementary fragment pairs on their reduced masses, their total kinetic energies, their inverse cross sections and their scission configuration populations. At the same time based on the covariant density functional theory and the di-nuclear system concept, we will study the potential energy surfaces of actinide nuclei, and its dependence on the inverse cross sections of the complementary fragment paires. In addtion, we will also study the scisson configuration populations through the fold integration of the level densities of the complementary fragment pairs. These studies could be helpfull for further understanding the structural effects of the fissile nucleus on the fission product mass distributions.