Abstract
The cross sections of the 72Ge( α , γ)76Se and 1°7Ag(ρ, γ)1°8Cd reactions were measured at energies relevant to p-process nucleosynthesis. The new data, together with cross section results from our previous ( α , γ) measure-ments on 65Cu and 118Sn and other ( α , γ) cross-section data reported in lit-erature are compared with statistical model calculations performed using the latest version (1.9) of the statistical model code TALYS. In addition, the effect on these calculations of different combinations of the optical model potentials (OMPs), nuclear level densities (NLDs) and γ-ray strength functions (γSFs) entering the calculations was investigated.
Highlights
The Hauser-Feshbach (HF) theory is extensively used to calculate the reaction cross sections required to solve the p-process reaction network [1, 2]
The new data, together with cross section results from our previous (α, γ) measurements on 65Cu and 118Sn and other (α, γ) cross-section data reported in literature are compared with statistical model calculations performed using the latest version (1.9) of the statistical model code TALYS
HF calculations require as input parameters nuclear masses, Nuclear Level Densities (NLDs) and transmission coefficients, with the later ones obtained from nucleon-nucleus and α-particle–nucleus Optical Model Potentials (OMPs) and γ-ray strength functions
Summary
The Hauser-Feshbach (HF) theory is extensively used to calculate the reaction cross sections required to solve the p-process reaction network [1, 2]. HF calculations require as input parameters nuclear masses, Nuclear Level Densities (NLDs) and transmission coefficients, with the later ones obtained from nucleon-nucleus and α-particle–nucleus Optical Model Potentials (OMPs) and γ-ray strength functions (γSFs) As these nuclear parameters are described by either phenomenological or microscopic models, nuclear physics uncertainties entering p-nuclei abundance calculations depend strongly on their reliability that has to be checked. This check is the main motivation of all experimental works, including the present one, aiming at determining cross sections of capture reactions relevant to the p process. Their comparison with HF calculations allows to evaluate and, improve the OMP, NLD and γSF models
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