Evaporation residues from the fusion of 32S on 27Al at E = 142-227 MeV

The evaporation residues from the reaction 32S on 27Al were measured at 142, 153, 175, 187 and 227 MeV incident sulphur energies, using a time-of-flight spectrometer. The measured fusion-evaporation residue excitation function shows a maximum around Elab = 170 MeV, which corresponds to a limiting angular momentum of 43 ℎ. Several possible mechanisms were investigated as being responsible for this limitation. It was found that both fission and entrance channel effects could be the limiting factors for the fusion-evaporation cross section at high energies. (orig.)