Fission fragment mass distributions in reactions forming the 213Fr compound nucleus.

The fission fragment mass angle correlations and mass ratio distributions have been investigated for the two systems 16O+197Au and 27Al+186W, leading to the same compound nucleus 213Fr around the Coulomb barrier energies. Systematic analysis of the variance of the mass distributions as a function of temperature and angular momentum suggests true compound nuclear fission for both the reactions, indicating the absence of nonequilibrium fission processes. [ABSTRACT FROM AUTHOR]