Fusion and binary-decay mechanisms in the 35Cl+24Mg system at E/A≈8 MeV

Compound-nucleus fusion and binary-reaction mechanisms have been investigated for the Cl-35+Mg-24 system at an incident beam energy of E-lab=282 MeV. Charge distributions, inclusive energy spectra. and angular distributions have been obtained for the evaporation residues and the binary fragments. Angle-integrated cross sections have been determined for evaporation residues from both the complete and incomplete fusion mechanisms. Energy spectra for binary fragment channels near the entrance-channel mass partition are characterized by an inelastic contribution that is in addition to a fully energy damped component. The fully damped component which is observed in all the binary mass channels can be associated with decay times that are comparable to, or longer than, the rotation period. The observed mass-dependent cross sections for the fully damped component are well reproduced by the fission transition-state model, suggesting a fusion followed by fission origin. The present data cannot, however, rule out the possibility that a long-lived orbiting mechanism accounts for part or all of this yield.