Monte-Carlo study of pre-neutron emission mass and energy for neutron-induced ²³²Th fission

Abstract

The development of fourth-generation reactors and advanced nuclear energy systems require high-precision, multi-nuclide, and wide-energy-area neutron nuclear data. However, the current nuclear energy-related nuclear fission data in the China Nuclear Data Evaluation Library (CENDL library) are incomplete and cannot meet the current need. It is extremely important to establish the reliable calculation methods and tools for the neutron nuclear data. Based on the Monte-Carlo method, a model for calculating the pre-neutron fission fragment is established in this work. The mass and kinetic energy distribution of <sup>232</sup>Th(n,f) reaction at the medium- and low- incident neutron energy are studied. The calculations of the mass distribution with the different values of incident energy are compared with the experimental results. The maximum deviation of this work from the experimental data is ~1%, which is advantageous compared with the GEF and TALYS code (maximum deviation from the experimental value is ~2%). The calculation of the pre-neutron fission fragment kinetic energy also shows good agreement with experimental result. The results indicate that this model can well describe and predict the characteristics of pre-neutron fission fragment for <sup>232</sup>Th(n,f) reaction at the medium- and low- incident neutron energy. It also provides a new idea for calculating the neutron-induced actinide fission reactions.

A method to simulate Twin Frisch-grid ionization chamber response to fission fragments

“…The AC/DC module of COMSOL was used to investigate the field maps, including electric field and weighting potential [13]. On the other hand, Geant4 is a Monte-Carlo transport toolkit that has proven to be an efficient tool for studying the properties of the fission products for neutron-induced fission and the FFs transportation [16][17][18]. In this study, Geant4 was used to perform the generation of the FFs and their transportation.…”