Abstract
For nucleosynthesis networks of isotopes heavier than those in the iron-peak region, reaction rates are often calculated within the Hauser-Feshbach statistical model. The accuracy of the predicted cross sections strongly depends on the uncertainties of the nuclear-physics input-parameters. These are nuclear-level densities, γ -ray strength functions, and particle+nucleus optical-model potentials. Here we report on the investigation of statistical properties of nuclei via radiative proton-capture reactions using high-resolution γ -ray spectroscopy.
Highlights
The Hauser-Feshbach (HF) statistical model is widely used to predict reactions rates for nucleosynthesis process like the r process [1] or the various p processes [2]
For nucleosynthesis networks of isotopes heavier than those in the iron-peak region, reaction rates are often calculated within the Hauser-Feshbach statistical model
One key element in understanding the nucleosynthesis in stellar environments is a robust basis of models for nuclear-physics input as nuclear-level densities (NLDs) and γ-ray strength functions [3]
Summary
The Hauser-Feshbach (HF) statistical model is widely used to predict reactions rates for nucleosynthesis process like the r process [1] or the various p processes [2]. Uncertainties in the predictions of these reaction rates can vary by orders of magnitude depending on the nuclear-physics models which are entering the HF calculations. One key element in understanding the nucleosynthesis in stellar environments is a robust basis of models for nuclear-physics input as nuclear-level densities (NLDs) and γ-ray strength functions (γSFs) [3]. In addition to their direct impact to reaction-network calculations, cross-section measurements of radiative charged-particle reactions can be a useful tool to investigate the statistical properties of nuclei. We report on two methods which can be used to study γSFs as well as NLDs; the measurement of partial (p,γ) cross sections and the study of two-step γ-ray cascades
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