Three-body Description of $2n$-Halo and Unbound $2n$-Systems: ${}^{22}$C and ${}^{26}$O

Abstract

We study the two-neutron correlations in the ground state of the weakly-bound two-neutron halo nucleus ${}^{22}$C sitting at the edge of the neutron-drip line and also in the unbound nucleus ${}^{26}$O sitting beyond the neutron dripline. For the present study, we employ a three-body (core$+n+n$) structure model designed for describing the two-neutron halo system by explicit inclusion of unbound continuum states of the subsystem (core$+n$). We use either a density-independent or a density-dependent contact-delta interaction to describe the neutron-neutron interaction and its strength is varied to fix the binding energy. We report the configuration mixing in the ground state of these systems for different choices of pairing interactions.

Comments: 4 Pages, 1 Figure, 2 Tables. 13th International Conference on Nucleus-Nucleus Collisions (NN2018)