COMPARISON OF THE GAMMA-RAY YIELD FUNCTIONS FOR THE C-12+MG-24 AND O-16+SI-28 REACTIONS

The -ray yield functions for the C12 + Mg24 reaction have been studied from Ec.m.=15 to 23.7 MeV and the O16 + Si28 reaction from Ec.m.=20 to 34.9 MeV. Structure in the form of a broad oscillation was observed for some channels of the C12 + Mg24 reaction, but for the O16 + Si28 reaction no structure was detected. It was also noted that the fusion-evaporation processes to high spin states of the residual nuclei play a greater role in the C16 + Si28 reaction than for C12 + Mg24. These observations are consistent with a greater surface transparency in the case of the C12 + Mg24 system. NUCLEAR REACTIONS C12 + Mg24, EMg24=45-71 MeV; O16 + Si28, ESi28=55-96 MeV. Natural carbon and oxygen targets. Measured I(E). © 1979 The American Physical Society.