中子诱发重核裂变后产物的演化规律及定量描述研究，重在建立科学的裂变模型。本项目一方面开展五维位能面模型研究，发展中子诱发重核裂变后现象的理论，定量描述裂变核在断点前的势能分布及势能随形变的演化；另一方面，建立唯象模型研究复合核在断裂点时刻的驱动势分布，评价计算中子诱发锕系重核裂变后，发射中子前裂变碎片的质量分布数据；第三，将唯象模型植入Geant4程序，Geant4调用该模型模拟中子诱发重核裂变过程，进一步研究唯象模型对裂变后物理描述的科学性和普适性，定量研究裂变碎片质量分布、电荷分布、平均总动能分布的特性和物理机制；最终，将实验测量数据与理论计算数据对比分析，系统地评价给出不同能量中子诱发不同重核裂变后裂变碎片质量分布、电荷分布和动能分布数据。为核装置研究、新型核能利用系统的研发提供可靠的数据支持，对全方位裂变后理论研究提供方案，同时为培养国防科技领域青年科技人才提供帮助。

Developing the scientific fission model is key to studying on the evolution rule and quantitative description of post-fission phenomenon for neutron-induced heavy nuclei fission. Firstly, based on five-dimensional deformation space, we develop post-fission theory for neutron-induced fission to quantitatively describe the potential energy distribution before the breakpoint, and describe potential energy along with the evolution of the deformation. Secondly, we establish a phenomenological model to precisely calculate the driving potential distribution and pre-neutron-emission mass distributions for neutron-induced heavy nuclei fission. Thirdly, phenomenological model is implanted on Geant4, Geant4 code simulates physical process of neutron-induced actinide nuclei post-fission, which contributes to further research on scientificity and universality, and also break out the limitation for computer capacity. Based on potential-driving model, Geant4 code studies and calculates the mass or charge distributions for independent yields and cumulative yields, kinetic energy distribution and fission neutron spectrum. Ultimately, we develop TFGIC detector to experimental research on mass distribution and kinetic energy distribution for neutron-induced heavy nuclei post-fission. Compared between experimental measurement data and theoretical data, we evaluate and provide the mass distribution and kinetic energy distribution for neutron-induced heavy nuclei post-fission, which will provide reliable data for the developments of nuclear device and new nuclear power system. It is help to provide solutions for all-round fission theory for neutron-induced heavy nuclei fission, meanwhile, it is help to train more young talent for national defendant science and technology.