https://doi.org/10.1051/epjconf/202532203003
A versatile R-matrix module including alternative parametrizations
Atominstitut, TU Wien, Stadionallee 2, 1020 Vienna, Austria
* e-mail: thomas.srdinko@tuwien.ac.at
** e-mail: helmut.leeb@tuwien.ac.at
Published online: 14 March 2025
The evaluation of nuclear reaction data within the resolved resonance regime relies on phenomeno-logical R-matrix analyses. In absence of quantitatively reliable microscopic models phenomenological R-matrix manages to reproduce experiment data at high accuracy especially in the resolved resonance regime with a limited number of parameters while unitarity constraints and sum rules are automatically met. However, due to non-trivial mapping between fitting parameters and observables as well as interference effects, standard R-matrix parameters only loosely correlate with observed resonance structures in cross sections making the fitting process challenging. Elegant alternative parametrizations have been introduced by Brune [1] and recently by Park [2] to enforce the agreement between R-matrix parameters and observed resonance positions, thus simplifying the fitting process. In this contribution the alternative parametrizations are compared as well as the successful implementation of Park’s parametrization into the R-matrix module of GECCCOS [3] is demonstrated on first examples.
© The Authors, published by EDP Sciences, 2025
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
