Speaker
Description
Fission fragments are highly excited after scission, and they de-excite by the emission of neutrons and the subsequent gamma emission. The products before and after the emission of neutrons and gammas are called pre- and post-neutron fission fragments, respectively. Pre- and post-neutron emission fission product yields (FPY) can be related through the emitted neutrons, i.e. neutron multiplicity. To have comprehensive understanding of the fission process, one need to describe both pre- and post-neutron FPY data by taking into account the neutron multiplicity.
In this work, we attempt to describe post-neutron emission FPY by using pre-neutron FPY and neutron multiplicity data. We propose a simple empirical model for the calculation of pre-neutron FPY. Then, the experimental data for the neutron multiplicity of each fission fragment mass are used to calculate the post-neutron FPY. The probability of the number of emitted neutrons from each fragment is not known, and thus a few different assumptions for the neutron multiplicity are made. Despite naive approximations, calculated post-neutron fission product mass distributions reproduce the experimental data well. In this manner, we may describe the pre- and post-neutron emission FPY and the neutron multiplicity in a consistent way.