ANALYSIS OF PRESCISSION NEUTRON MULTIPLICITIES IN TERMS OF THE STATISTICAL-MODEL WITH KRAMERS DISSIPATIVE FISSION

Pre-scission neutron multiplicities in fusion-fission reactions, repor ted by Hinde et al., have been analysed in terms of the statistical mo del assuming a possible hindrance of the compound-nucleus fission widt h by the Kramers factor which depends on nuclear dissipation. Contrary to earlier results reported by Hofman, Back and Paul on an analysis o f the GDR gamma-decay, the nuclear dissipation deduced in the present analysis does not show a clear dependence on the temperature of the co mpound nucleus. On average, the deduced values of the nuclear dissipat ion are consistent with the one-body dissipation estimate.