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R-matrix theory was originally developed to describe nuclear reactions. The framework was further extended to describe {beta} decay to unbound states. However, at the time writing, no clear description of {gamma} decays to unbound states exist. Such a description will be presented in this note.
We review some aspects of R-matrix theory and its application to the semi-empirical analysis of nuclear reactions. Important applications for nuclear astrophysics and recent results for the ${}^{12}{rm C}(alpha,gamma){}^{16}{rm O}$ reaction are emphasized.
The secondary $gamma$ rays emitted following a nuclear reaction are often relatively straightforward to detect experimentally. Despite the large volume of such data, a practical formalism for describing these $gamma$ rays in terms of partial-wave $T$
Proton emission from deformed nuclei is described within the non-adiabatic weak coupling model which takes into account the coupling to $gamma$-vibrations around the axially-symmetric shape. The coupled equations are derived within the Gamow state fo
The 31S(p,gamma)32Cl reaction is expected to provide the dominant break-out path from the SiP cycle in novae and is important for understanding enrichments of sulfur observed in some nova ejecta. We studied the 32S(3He,t)32Cl charge-exchange reaction
Total absorption spectroscopy was used to investigate the beta-decay intensity to states above the neutron separation energy followed by gamma-ray emission in 87,88Br and 94Rb. Accurate results were obtained thanks to a careful control of systematic