Calculations of the Energy and Mass Yields from the Thermal-Neutron Fission ofU235

Improvements in a semiempirical correlation of the energy and mass yield data for ${\mathrm{U}}^{236}$ fission are presented. The available mass, energy, and neutron-emission data are correlated with each other within the accuracy of the input data. A simple model of the ${\mathrm{U}}^{236}$ fragments at scission is presented. This model, together with some experimental data, is used to predict the surface-tension parameters of the fragments and kinetic energies of the fragment pairs. The calculated kinetic energies agree reasonably well with experiment. The surface-tension parameters of the fragments show strong shell effects, as indicated in other studies. The shapes of the fragments at scission are estimated from the model.