Abstract
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.
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Acknowledgements
This work was supported in part by the National Research Foundation (NRF) of Korea funded by the Ministry of Science and ICT (NRF-2020R1A2C1102384, NRF-2018M7A1A1072274). TSP acknowledges the support from the IBS grant funded by the Korean government (No. IBS-R031-D1).
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Lee, J., Lee, YO., Park, TS. et al. Semi-empirical model to determine pre- and post-neutron fission product yields and neutron multiplicity. J. Korean Phys. Soc. 80, 953–963 (2022). https://doi.org/10.1007/s40042-022-00490-2
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DOI: https://doi.org/10.1007/s40042-022-00490-2