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We developed a method superposing two different fission modes calculated in afour-dimensional Langevin model to obtain more accurate fission fragment yieldand total kinetic energy (TKE). The two fission modes correspond to thestandard I and standard II modes reported by Brosa et al., and parameters inthe Langevin model and the superposing ratio were determined to reproduce thefission fragment yield of $^{240}$Pu of spontaneous fission. We alsoinvestigated the fission fragment yields and the TKEs of other Pu isotopes byusing the same Langevin parameters and different superposing ratios, such asspontaneous fission of $^{238,242}$Pu and neutron-induced fission of$^{239}$Pu. The prompt fission observables, such as the neutron multiplicity,the prompt fission neutron spectrum, and the independent fission product yieldwere calculated in the Hauser-Feshbach statistical decay model implemented in anuclear reaction code TALYS with $^{239}$Pu(n,f) in the incident energiesranging from thermal energy up to 5 MeV. The calculated fission observablesqualitatively reproduce several known trends while calculated results havequantitative discrepancies between reported data. Although more improvementsare needed for the most important nuclides, it turned out that our approach hasthe capability to provide prompt fission observables for difficult-to-measurenuclides.

Connection of four-dimensional Langevin model and Hauser-Feshbach theory to describe statistical decay of fission fragments