An investigation of radiative proton–capture reactions in the Cd–In mass region

Abstract The reaction network in the neutron–deficient part of the nuclear chart around A ∼ 100 contains several nuclei of importance to astrophysical processes, such as the p–process. This work reports on the results from recent experimental studies of the radiative proton-capture reactions 112,114Cd ( p , γ ) 113,115In. Experimental cross sections for the reactions have been measured for proton beam energies residing inside the respective Gamow windows for each reaction, using isotopically enriched 112Cd and 114Cd targets. Two different techniques, the in–beam γ–ray spectroscopy and the activation method have been employed, with the latter considered necessary to account for the presence of low–lying isomers in 113In ( E γ ≈ 392 keV, t 1 / 2 ≈ 100 min), and 115In ( E γ ≈ 336 keV, t 1 / 2 ≈ 4.5 h). Following the measurement of the total reaction cross sections, the astrophysical S factors have been additionally deduced. The experimental results are compared with Hauser–Feshbach theoretical calculations carried out with the most recent version of TALYS . The results are discussed in terms of their significance to the various parameters entering the models.