SEMIEMPIRICAL DETERMINATION OF THE SHELL CORRECTION TEMPERATURE AND SPIN DEPENDENCE BY MEANS OF NUCLEAR-FUSION

We study the temperature and angular momentum dependence of the shell effects in the fissioning nucleus by means of a theoretical analysis o f the total fission probability. We find clear evidence of the disappe arance of the shell correction to the fission barrier with both increa sing spin and temperature and propose a general method to determine th e level density at the saddle-point configuration. The results of the present study might explain the differences between the fission barrie rs extracted from the heavy-ion reactions and those obtained using lig ht-particle induced fission.