ONE-BODY DISSIPATION IN AGREEMENT WITH PRESCISSION NEUTRONS AND FRAGMENT KINETIC ENERGIES

Fission dynamics of hot nuclei have been investigated using the two-di mensional Langevin equation. Including particle evaporation in the con tinuous limit, prescission multiplicities of neutrons, protons, and al pha particles have been calculated. Both the calculated number of pres cission neutrons and the average total kinetic energy of fission fragm ents are consistent with experimental values when one-body dissipation is assumed. Unusually strong hydrodynamical two-body viscosity also r eproduces the experimental neutron multiplicity, but it significantly underestimates the average kinetic energy.