Fission product mass yield curves and their energy dependence

摘要: It has been found that the mass yield curves for 232Th, 233U, 235U, 238U and 239pU neutron fission can be fitted, with an accuracy of better than 20 %, by superposition two pairs asymmetric gaussian a single symmetric curve. The parameters fit have investigated as function nuclear temperature at saddle point fissioning compound nucleus, widths positions are to vary linearly this temperature. In addition, broad peaks in weights gaussians, being related partial cross sections. This empirical analysis compared predictions Nix (1969) model deficiencies existing theory discussed.