SENUC · Super Exotic NUClear systems at the limit of stability: Core excitations in halo nuclei and few-nucleon emitters.

Super Exotic NUClear systems at the limit of stability: Core excitations in halo nuclei and few-nucleon emitters.

The SENUC action aims to improve our understanding of processes related to the most exotic nuclear systems observed in radioactive ion beam facilities. What are the limits of nuclear stability? How do nuclear systems behave beyond the dripline boundaries? By studying the properties of exotic halo nuclei and few-nucleon emitters, the action will help assess how shell evolution shapes the limits of the nuclear chart, which could help address open questions regarding the strong force and nucleon-nucleon correlations. To that end, the researchers sought to describe core-excitation effects and reduce the gap between standard few-body reaction models and the microscopic many-body structures of nuclei at the limits of nuclear existence. The specific objectives of the action include: - Description of the scattering of two-nucleon halo nuclei (formed by a compact core and two valence neutrons) within a four-body framework including core excitations. The small separation energies and large radii associated with diffuse halo nuclei implies a large probability of valence excitation into continuum breakup states. Within this action, the effect of collective core excitations was studied and found to be important for the scattering of deformed cores on light targets. The results will help study processes involving the heaviest known halo systems, for which an inert core assumption is not realistic. - Description of the relative-energy distributions in the decay of unbound core+n+n systems, called two-neutron emitters. It was found that a decay state, built by time-evolving a non-stationary resonant state, can describe the asymptotic properties of the decay fragments. Interestingly, core excitations influence the total decay width and the shape of the relative-energy distributions. - Description of the above topics including microscopic inputs. This requires the folding of microscopic nuclear densities with a nucleon-nucleon interaction, leading to effective potentials to be used within the usual few-body models. This line of action is still in progress. The SENUC action results provide important building blocks for more advance studies on the dynamics of very exotic nuclear states.

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