R-matrix approach at the intersection with the statistical model regime

TU-Wien, Atominstitut, Wiedner Hauptstrasse 8-10, 1040 Wien, Austria

^a e-mail: tsrdinko@ati.ac.at
^b e-mail: leeb@kph.tuwien.ac.at

Published online: 13 September 2017

Abstract

A hybrid R-matrix approach is proposed which combines the pole term decomposition of the R-matrix and a background R-matrix which is based on a coupled-channel pseudo-potential. The pseudo-potential is appropriately chosen in order to recover the observables obtained by the statistical model at the energy-onset of its validity. The additional pole terms describe the resonance structure at low energy not attainable in statistical model calculations. Due to its construction the hybrid method allows a smooth transition at the intersection with the statistical model regime. A new R-matrix code based on this hybrid approach was constructed. First applications to n-¹⁶O nuclear data between 0.2 and 5.0 MeV are very promising.