Statistical and dynamical modeling of heavy-ion fusion–fission reactions

摘要

AbstractA modified statistical model and a four dimensional dynamical model based on Langevin equations have been used to simulate the fission process of the excited compound nuclei207At and216Ra produced in the fusion19F?+?188Os and19F?+?197Au reactions. The evaporation residue cross section, the fission cross section, the pre-scission neutron, proton and alpha multiplicities and the anisotropy of fission fragments angular distribution have been calculated for the excited compound nuclei207At and216Ra. In the modified statistical model the effects of spinKabout the symmetry axis and temperature have been considered in calculations of the fission widths and the potential energy surfaces. It was shown that the modified statistical model can reproduce the above mentioned experimental data by using appropriate values of the temperature coefficient of the effective potential equal toλ=0.0180±0.0055,0.0080±0.0030?MeV?2and the scaling factor of the f