Role of nuclear dynamics in deducing the fusion-fission time scales from prescission neutron multiplicities

Existing data on the prescission neutron multiplicities have been analyzed with a new method combining time-dependent statistical cascade calculations with Feldmeier's model of the dynamics of nucleus-nucleus collisions. The analysis resulted in the determination of the time scale ${\mathrm{\ensuremath{\tau}}}_{\mathit{f}}$ of fusion-fission reactions for different composite systems with excitation energies ranging from 80 to 240 MeV. The deduced values of ${\mathrm{\ensuremath{\tau}}}_{\mathit{f}}$ range from 5\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}20}$ to ${10}^{\mathrm{\ensuremath{-}}18}$ s. These time scales are approximately 10 times longer than those deduced for the same set of data with the ``static'' model used by Hinde and collaborators.

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