Evaporation decay following the 32S + 24,25,26Mg fusion

The evaporation residue cross-sections are measured for all the outgoing channels of the 32S + 24,25,26Mg fusion reaction leading to the formation of 56Ni, 57Ni, 58Ni compound nuclei in the range of Elab = (90-175)MeV. The identification in both A and Z is carried out by means of the in-beam γ-ray detection. Suppression of any long-lived γ radioactivity has been done by means of a beam chopper automatically controlled by the acquisition system. Correction for 12C and 16O impurities of the targets and of the beam is also applied. Comparison with statistical model calculation is performed through individual residue excitation functions, summed channel cross-sections and nucleon and α multiplicities. The general behaviour and the main features of the data are well accounted by the model, when a standard set of parameters is used. Due to the limitation of the angular momentum occurring in the entrance channel, a reduction of the α emission probability and consequently a favoured nucleon emission is observed, related to the decreasing angular momentum of the compounds