Systematic study of proton capture reactions in medium-mass nuclei relevant to the p process: The case of 103Rh and 113,115In

The cross sections of the Rh-103(p,gamma) Pd-104 and the In-113,In-115(p,gamma) Sn-114,Sn-116 reactions have been determined from. angular distribution measurements carried out at beam energies from 2 to 3.5 MeV. An array of four highly efficient HPGe detectors all shielded with BGO crystals for Compton background suppression was used. Astrophysical S factors and reaction rates were deduced from the measured cross sections. Statistical model calculations were performed using the Hauser-Feshbach (HF) code TALYS and were compared with the new data. Agood agreement between theory and experimentwas found. In addition, the effect of different combinations of the nuclear input parameters entering the HF calculations on the ground-state reaction rates was investigated. It was found that these rates differ by a factor 3 at the most, being thus within the average discrepancies observed between calculated p-nuclei abundances and observations, if certain combinations of optical model potentials, nuclear level densities, and gamma-ray strength functions are used.