Studies of the 32S + 182W reaction

Fission-like products from the reaction 32S + 182W were measured over the entire angular range from Theta = 10-1700 and for bombarding energies of E/sub lab/ = 166, 177, 222, and 260 MeV using an array of eight Si detectors. From the measured energy and time-of-flight the product mass was determined event-by-event by performing the appropriate corrections for the plasma delay and pulse height defect associated with Si detectors. The mass, angular, and total kinetic energy distributions of fission-like fragments are obtained by assuming two-body kinematics. The angular distributions are more anisotropic than predicted by the standard fission theory. Furthermore, they observe an angular dependence of the fragment mass distributions, a feature which is incompatible with compound nucleus decay. Both of these observations indicate that a fraction of fission-like products originate from quasi-fission, a process in which a large degree of mass transfer occurs between the two interaction nuclei in a short time scale