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

• Published in: Journal of the Korean Physical Society Vol. 80; no. 10; pp. 953 - 963
• Main Authors: Lee, Jounghwa, Lee, Young-Ouk, Park, Tae-Sun, Schillebeeckx, Peter, Hong, Seung-Woo
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Physical Society 01.05.2022; Springer Nature B.V; 한국물리학회
• Subjects: Atomic properties; Fission products; Mathematical and Computational Physics; Mathematical models; Neutron emission; Neutrons; Original Paper - Particles and Nuclei; Particle and Nuclear Physics; Physics; Physics and Astronomy; Theoretical; Thermal neutrons; 물리학; Neutron multiplicity; Poisson distribution; Fission product yield
• ISSN: 0374-4884; 1976-8524
• DOI: 10.1007/s40042-022-00490-2

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 with a mass number A ∗ to decay to a post-emission fragment with a mass number A . 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 233 U, 235 U and 239 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.