Energy Dependence of Complete and Incomplete Fusion for Mass 56 Entrance Channel Systems at E/sub Lab/ > 10 MeV/nucleon

摘要

Three entrance channels sup 16 O + sup 40 Ca, sup 28 Si + sup 28 Si, and sup 32 S + sup 24 Mg forming the sup 56 Ni compound nucleus have been studied in the energy range 5 to 17 MeV/nucleon. Time-of-flight measurements provided mass identification and allowed for extraction of velocity distributions. These distributions were used to identify evaporation residues and to decompose the evaporation residues yields into complete and incomplete fusion components using evaporation code calculations. The velocity centroids as function of angle and mass are found to put constraints on the possible pre-equilibrium emission of light particles. 16 refs., 6 figs.