Competition between fission and neutron emission at high spins and excitation energies

Abstract

The influence of deformation changes at high spins and excitation energies on the competition between fission and neutron emission is studied in the framework of the statistical theory for $^{210}\mathrm{Po}$ and $^{232}\mathrm{U}$. It is found that the shell effects at high spins strongly affect the competing processes if the height of the fission barrier is comparable with the neutron separation energy. In this case the ratio $\frac{{\ensuremath{\Gamma}}_{f}}{{\ensuremath{\Gamma}}_{n}}$ is influenced by the rotation mainly through the change of the saddle point deformation.NUCLEAR STRUCTURE $^{210}\mathrm{Po}$, $^{232}\mathrm{U}$; studied $\frac{{\ensuremath{\Gamma}}_{f}}{{\ensuremath{\Gamma}}_{n}}$; dependence on angular momentum; shell effects at high spins; statistical theory.