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Post-neutron emission fission product mass distributions are calculated byusing pre-neutron emission fission product yields (FPYs) and neutronmultiplicity. A semi-empirical model is used to calculate the pre-neutron FPY,first. Then the neutron multiplicity for each fission fragment mass is used toconvert the pre-neutron FPY to the post-neutron FPY. In doing so, assumptionsare made for the probability for a pre-emission fission fragment with a massnumber $A^*$ to decay to a post-emission fragment with a mass number $A$. Theresulting post-neutron FPYs are compared with the data available. The systemswhere the experimental data of not only the pre- and post-neutron FPY but alsoneutron multiplicity are available are the thermal neutron-induced fission of$^{233}$U, $^{235}$U and $^{239}$Pu. Thus, we applied the model calculations tothese systems and compared the calculation results with those from the GEF andthe data from the ENDF and the EXFOR libraries. Both the pre- and post-neutronfission product mass distributions calculated by using the semi-empirical modeland the neutron multiplicity reproduce the overall features of the experimentaldata.

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