Semi-empirical model to determine pre- and post-neutron fission product yields and neutron multiplicity

Post-neutron emission fission product mass distributions are calculated by using pre-neutron emission fission product yields (FPYs) and neutron multiplicity. A semi-empirical model is used to calculate the pre-neutron FPY, first. Then the neutron multiplicity for each fission fragment mass is used to convert the pre-neutron FPY to the post-neutron FPY. In doing so, assumptions are made for the probability for a pre-emission fission fragment to a post-emission fragment. The resulting post-neutron FPYs are compared with the data available. The systems where the experimental data of not only the pre- and post-neutron FPY but also neutron multiplicity are available are the thermal neutron-induced fission of U, U and Pu. Thus, we applied the model calculations to these systems and compared the calculation results with those from the GEF and the data from the ENDF and the EXFOR libraries. Both the pre- and post-neutron fission product mass distributions calculated by using the semi-empirical model and the neutron multiplicity reproduce the overall features of the experimental data.

LEE Jounghwa;  LEE Young-Ouk;  PARK Tae-Sun;  SCHILLEBEECKX Peter;  HONG Seung-Woo; 

2022-09-05

KOREAN PHYSICAL SOC

JRC129585

0374-4884 (online),   

https://link.springer.com/article/10.1007/s40042-022-00490-2,    https://publications.jrc.ec.europa.eu/repository/handle/JRC129585,   

10.1007/s40042-022-00490-2 (online),