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The present work concerns two successful models used today: Point by Point(PbP) and the Monte Carlo approaches. The description of the PbP model and ofthe extended Los Alamos model for higher energies that takes into account thesecondary chains and ways is given in Chapter II. In this chapter are givenalso examples of PbP and most probable fragmentation approach calculations forvarious quantities which characterize prompt emission: multi-parametricmatrices, quantities as a function of fragment mass, quantities as a functionof the TKE and total average quantities, for different spontaneous and neutroninduced fissioning systems. Special care was given to the TXE partition betweenthe fully accelerated fission fragments, two partition methods used in the PbPmodel being discussed in details. In Chapter III is given the description ofthe Monte Carlo treatment included in the FIFRELIN code. Only those aspectsthat differ from the PbP treatment are emphasized. A special attention is givento the latest developments of the code concerning the inclusion of the energydependent compound nucleus cross section of the inverse process of neutronevaporation from fragments. In this chapter examples of calculation with theFIFRELIN code for the case of the standard fissioning system 252Cf(SF) aregiven. Original results for several plutonium spontaneous fissioning systems(236,238,240,242,244Pu) and one neutron induced fissioning system(239Pu(nth,f)) obtained with both PbP and Monte Carlo treatments are given inChapter IV. The last chapter includes an overview of the most importantconclusions resulting from the intercomparison of the results obtained withboth treatments in chapter IV.

Theoretical description of prompt fission neutron multiplicity and spectra