T. Wada et al., ONE-BODY DISSIPATION IN AGREEMENT WITH PRESCISSION NEUTRONS AND FRAGMENT KINETIC ENERGIES, Physical review letters, 70(23), 1993, pp. 3538-3541
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.