Fission fragment angular distribution for theF19+Au197fusion-fission reaction at near-barrier energies

Abstract

Angular distribution of fission fragments have been measured for $^{19}\mathrm{F}+^{197}\mathrm{Au}$ reaction at bombarding energies from 91 to 110 MeV. Fission fragment angular distributions have been calculated by transition state model with the transmission coefficients obtained using the coupled-channels theory. The calculated angular anisotropies are in good agreement with the experimental anisotropies. The experimental fission cross sections have also been reproduced on the basis of the coupled-channels theory. The results of angular distribution measurement do not show any significant contribution from quasifission as was reported in the literature based on the measurement of evaporation residues and mass distribution.