Angular momentum dependence of the prescission time of medium mass hot nuclei

We have deduced the prescission time of hot nuclei as a function of the angular momentum from the light charged particle– and γ ray–multiplicities measured simultaneously in coincidence with fully-damped binary decay fragments in the reaction of 58Ni+56Fe at the incident energy of 10.0 MeV/nucleon. The prescission time was found to decrease as the angular momentum of the system increases. Theoretical calculations of the fissioning motion with the Langevin equation have shown that this dependence originates primarily from the change in the potential landscape due to the centrifugal energy.