TIME-SCALE AND EXCITATION-ENERGY PARTITION IN SEQUENTIAL BINARY DECAYS INDUCED BY HEAVY-ION COLLISIONS AT SIMILAR-OR-EQUAL-TO-6MEV-A

We studied the sequential binary decay of the systems S-32+Sc-45, Ge-7 6, Y-89, Co-59, Cu-63 and F-19+Cu-63 induced by collisions at similar or equal to 6 MeV.A. The two stages of the process have reaction-times compatible with the dynamics of different mechanisms. The study of th e excitation energy partition shows that the reaction mechanism of the first step has influence on the de-excitation of the primary fragment s producing two decay components which have different time scale.