Investigating nuclear dissipation properties at large deformations via excitation energy at scission

Abstract

Using the stochastic Langevin model coupled with a statistical decay model, we study nuclear dissipation properties at large deformations with excitation energy at scission (\(E_{\mathrm {sc}}^*\)) measured in experiments. It is found that the postsaddle dissipation strength required to fit \(E_{\mathrm {sc}}^*\) data is 12 \(\times 10^{21}\) s\(^{-1}\) for \(^{254,256} \)Fm and 6 \(\times 10^{21}\) s\(^{-1}\) for \(^{189}\)Au, which has a smaller postsaddle deformation than the former heavy nucleus, showing a rise of nuclear dissipation strength with increasing deformation.