Complete fusion of heavy ions with 27Al

Cross sections for evaporation residues following complete fusion have been measured for the bombardment of 27Al with 81-, 105-, 126-, and 168-MeV 16O, 138- and 210-MeV 20Ne, and 336-MeV 32S. The results were obtained using a counter telescope and, in some cases, differ considerably from previous work with mica track detectors. The experimental critical angular momenta for fusion are in good agreement with recent theoretical calculations for the O and Ne bombardments. Our data suggest parameters for the critical distance of approach which are significantly smaller than previously reported values