Fission fragment angular distribution measurements for ~(16)O+ ~(194)Pt reaction at energies near the Coulomb barrier

摘要

Fission fragment angular distributions have been measured for ~(16)O+ ~(194)Pt reaction forming the compound system ~(210)Rn, in the laboratory energy range from 79 to 90 MeV. The measured fission fragment anisotropies as a function of E _(c.m.)/V _B are compared with the predictions of standard saddle point statistical model (sspm). Anisotropies calculated using the average excitation energy and angular momentum values could not reasonably fit the experimental data. Statistical model calculations were performed using the pace with modified fission barrier and level density parameters. Fission probability, evaporation residue cross section and neutron multiplicity were simultaneously used to fix the statistical parameters. Model calculations incorporating the chance nature of fission decay and scaled values of the rotating finite range model (RFRM) moment of inertia could reasonably fit the fragment angular anisotropies.