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 $A\sim 100$ 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 ${}^{112,114}\mathrm{Cd}(p,\gamma {)}^{113,115}\mathrm{In}$. 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 ${}^{112}\mathrm{Cd}$ and ${}^{114}\mathrm{Cd}$ targets. Two different techniques, the in-beam $\gamma$-ray spectroscopy and the activation method have been employed, with the latter considered necessary to account for the presence of low-lying isomers in ${}^{113}\mathrm{In}$ ($E_{\gamma }\approx 392$~keV, $t_{1/2}\approx 100$~min), and ${}^{115}\mathrm{In}$ ($E_{\gamma }\approx 336$~keV, $t_{1/2}\approx 4.5$~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.

17 pages, 9 figures, accepted for publication in Nuclear Physics, Section A. arXiv admin note: text overlap with arXiv:1905.13199

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• Alpha-induced cross sections of 106Cd for the astrophysical p-process
• Relativistic RPA in axial symmetry
• The activation method for cross section measurements in nuclear astrophysics
• A simple analytic model for astrophysical S-factors
• Cross-section measurements of radiative proton-capture reactions in ${}^{112}$Cd at energies of astrophysical interest