Structure and reaction observables of drip-line nuclei with the Gamow Shell Model

Nicolas Michel (Institute of modern physics Lanzhou, China)

Drip-line nuclei are open quantum systems, which can present halos in the asymptotic region and can be unbound with respect to particle emission. They are consistently described with the Gamow Shell model (GSM). GSM is a configuration interaction model whose building block is the one-body Berggren basis. The Berggren basis contains bound, resonance and scattering states. Continuum degrees of freedom are then directly included at basis level, while inter-nucleon correlations are taken into account via configuration mixing. GSM has been applied in a no-core picture using realistic interactions. Thus, unbound systems bearing A=3-5 nucleons could be precisely studied. In particular, the structure of the unbound 0⁺(1) state of ⁴He could be investigated. When the number of nucleons increases, it is more convenient to use the core + valence nucleon framework. The properties of drip-line nuclei with A ~ 10-20 nucleons could then be assessed. In particular, the hydrogen chain and sd-shell proton-rich nuclei have then been considered with this approach. For reaction observables, we developed GSM with coupled-channels (GSM-CC). We could then implement the calculation of cross sections within GSM-CC. We will concentrate on direct reactions involving an ⁴He target, on which many-body projectiles, bearing A=2-4 nucleons, are scattered.