Research on Spontaneous Fission Yield of Gas Product for ²⁴⁰Pu with Phenomenological Model

Based on the physics of multi-modal random neck rupture, a phenomenological model was developed to study the fission yield of ²³⁹Pu neutron-induced fission and ²⁴⁰Pu spontaneous fission system, where the model parameters were determined by the least square fitting with the available experimental data. The yields calculated with the phenomenological model were analysed and reevaluated, and the recommended fission yields of ^87,88Kr and ^133,135Xe from ²⁴⁰Pu spontaneous fission were presented.