Neutron spectra and level density parameters from the 16O+12C fusion reaction

Residues following 16O+12C fusion were identified by their characteristic γ rays. For several transitions in 23Mg, 25Mg, and 26Al, coincident neutron spectra were measured at six angles. Through use of an evaporation code, comparisons were made of these spectra with predictions of the statistical model at five 16O projectile energies between 43.2 and 56.0 MeV. The result requires an excitation energy dependence for the effective radius parameter r0, which determines the spin cutoff factor