Analysis of fusion–fission dynamics in superheavy mass region by pre-scission neutron multiplicities

Abstract

We discuss thc fusion-fission process in superheavy mass region. By analyzing the mass distribution of fission fragments, we can distinguish between fusion-fission process and quasi-fission process. We investigate these two processes using the fluctuation-dissipation model. In the dynamical calculation, we employ the three-dimensional Langevin equation. We find 90 ∼ 99% of mass symmetric fission events come from the quasi-fission process in the superheavy mass region. In order to classify the fusion-fission process more precisely. we analyze the pre-scission neutron multiplicity. © 2004 Elsevier B.V. All rights reserved.