Production of high-energy gamma rays in proton- and alpha-induced reactions

The high-energy gamma rays have been measured in proton and alpha-induced reactions on medium mass target nuclei In-11(5) and Sn-112, respectively. Theoretical analyses of the spectra have been performed within the Hauser-Feshbach statistical model and the Akkermans-Gruppelaar exciton model formalisms. It is observed that the proton-induced reaction has significant contribution from the direct-semidirect capture in the region E-gamma approximate to 10-20 MeV. The He-4-ion-induced reaction could be described reasonably well by the results of the statistical model calculations. A reduced level density parameter, as compared to that used for the proton-induced reaction, was required to explain the high-energy gamma-ray spectrum in the He-4-ion-induced reaction.