Langevin calculations of fission fragment mass distribution in fission of excited nuclei

A stochastic approach based on two-dimensional Langevin equations was applied to study the main features of fission fragment mass distributions of excited fissioning systems. The forms and the variances of fission fragment mass distributions in the fissility parameter range 20<Z²/A<40 have been calculated. The calculated fission fragment mass distributions and their variances on the whole are consistent with experimental data. The calculations were carried out within two liquid drop models (LDM's): the LDM with the sharp surface of the nucleus and the LDM with the finite range of nuclear interaction.