Speaker
Description
We review recent theoretical developments for the description of charge-exchange reactions involving heavy ions. In particular, second-order processes provide a crucial touchstone to test our understanding of the underlying physics mechanisms and the modelling of nuclear structure aspects. In this contribution, collisional heavy ion double charge exchange (DCE) reactions, induced by second order nucleon-nucleon interactions, are shown to provide access to the two-body transition densities (2BTD) of the complementary DCE transitions in the interacting nuclei, explicitly entering the reaction cross section. The theoretical results are applied to reaction systems investigated by the NUMEN collaboration. The 2BTD are evaluated adopting the HF+BCS+QRPA scheme, employing different Skyrme interactions, thus probing the sensitivity of the cross section to specific channels of the effective interaction. These investigations open the way for possible future comparisons between the predictions of different structure models and to probe their impact on charge-exchange reaction cross sections.
References:
1) J.I.Bellone, M.Colonna, D.Gambacurta and H.Lenske, Heavy-ion double-charge-exchange reactions as probes for two-body transition densities, Phys.Rev.C 111 (2025) 6, L061602
2) B.Urazbekov et al. (NUMEN Collaboration), Direct and two-step processes in the 275 MeV 40Ca(18O,18F)40K reaction within a unified model, Phys.Rev.C 111 (2025) 4, 044603