Cross-section measurements of radiative proton-capture reactions in Cd-112 at energies of astrophysical interest

摘要

Reactions involving the group of nuclei commonly known as p nuclei are part of the nucleosynthetic mechanisms at astrophysical sites. The In-113 nucleus is such a case with several open questions regarding its origin at extreme stellar environments. In this paper, the experimental study of the cross sections of the radiative proton-capture reaction Cd-112(p, gamma)In-113 is attempted for the first time at energies lying inside the Gamow window with an isotopically enriched Cd-112 target. Two different techniques, the in-beam gamma-ray spectroscopy and the activation method, have been applied. The latter method is required to account for the presence of a low-lying In-113 isomer at 392 keV having a half-life of approximate to 100 min. From the cross sections, the astrophysical S factors and the isomeric ratios have been additionally deduced. The experimental results are compared to detailed Hauser-Feshbach theoretical calculations using TALYS and discussed in terms of their significance to the optical model potential involved.