Consistency of angular momentum and cross section in near-barrier fusion of 28Si+68Zn, 32S+64Ni, and 37Cl+59Co

Partial cross sections of evaporation residues following the fusion reactions 28Si+68Zn, 32S+64Ni, and 37Cl+59Co have been measured for center-of-mass energies from 5 MeV below to 10 MeV above the Coulomb barrier. Average angular momentum bar l has been deduced from these cross sections on the basis of statistical-model calculations. These are compared to bar l values that can be derived from the shape of the measured excitation function of these reactions, on the basis of some simple assumptions. Good agreement is found between these two, establishing the validity of these assumptions