ENERGY-DEPENDENCE OF FUSION EVAPORATION-RESIDUE CROSS-SECTIONS IN THESI-28-12 REACTION(C)

Fusion evaporation-residue cross sections for the Si-28 + C-12 reactio n have been measured in the energy range 18 less-than-or-equal-to E(c. m.) less-than-or-equal-to 136 MeV using time-of-flight techniques. Vel ocity distributions of mass-identified reaction products were used to identify evaporation residues and to determine the complete-fusion cro ss sections at high energies. The data are in agreement with previousl y established systematics which indicate an entrance-channel mass-asym metry dependence of the incomplete-fusion evaporation-residue process. The complete-fusion evaporation-residue cross sections and the deduce d critical angular momenta are compared with earlier measurements and the predictions of existing models.