Study of fission fragment mass distributions for the reaction 18O + 197Au

The study of fusion fission dynamics in medium mass nuclei is of great interest due to the observation of many interesting and exciting results. Recent experimental results on 19F + 197Au shows that mass equilibration is slower than the K degrees of equilibration. These results are some what contradictory to the results observed in heavier and highly fissile systems. In order to understand the relaxation mechanism of various degrees of freedom in less fissile systems one has to study both fission fragment angular and mass distributions. The complete K equilibration for the reaction 18O + 197Au through fission fragment angular distribution studies have been reported previously. The entrance channel mass asymmetry of the reaction 18O + 197Au is very much similar to that of the reaction 19F + 197Au, where fission fragment angular distributions show no evidence of pre-equilibrium fission. In order to investigate complete mass equilibration is taking place or not in this reaction, fission fragment mass distributions for the reaction 18O + 197Au around the coulomb barrier have been studied