Coincidence study of the 27Al(16O, 12Cα)27Al reaction at 65 MeV

Both in-plane and out-of plane angular correlations of coincident C and α particles have been measured for 65-MeV 16O bombardment of an 27Al target. Exploitation of the time-of-flight method enabled measurement of very-low-energy alpha particles at back angles. Results from the present experiment show that evaporation from an intermediate nucleus 31P* accounts for the majority of the C-α coincidence events observed. A small number of alpha particles from the break-up of 16O* were detected at angles around that of the carbon detector. Fewer than 10% of the alpha particles detected are of pre-equilibrium origin. this finding is in sharp contrast to earlier results. 11 figures