Mass - energy distribution of fission fragments in diffusion model

A method is suggested for calculating the two-dimensional mass-energy distribution of fission fragments in the framework of the diffusion model based on the Fokker-Planck equation (FPE) for the distribution function of collective variables. The mass-energy distribution and all relevant parameters are calculated for a totality of excited compound nuclei in a wide region of the parameter Z2/A (from 30 to 44). The model takes into account the coordinate dependence of all FPE coefficients calculated in the hydrodynamical approximation. The calculations provide a good quantitative fit to all characteristics of the mass-energy distribution and their dependences upon different parameters of the compound nucleus