Semiclassical description of heavy-ion collisions

The heavy-ion reaction and fission dynamics are modelled in terms of a single neutron within two mean potentials, the centers of which are moving along given classical trajectories. For a finite depth two-center potential an adiabatic single-particle basis consisting of bound states and Gamow states is presented, in which particle emission and Landau-Zener excitation are treated for peripheral collisions. Within a similar model the features of particle emission from a fissioning system are investigated. It is concluded that the one-body mechanism can cause only a small contribution to the neutron emission spectra in nuclear fission, which hardly can be disentangled evaporation component calculated with limited precision. The creation of very fast neutrons seems to be unlikely. 10 figs., 13 refs