Description of continuum structures in a discrete basis: Three-body resonances and two-nucleon decays

Abstract

Weakly bound and unbound three-body nuclei are studied by using the pseudostate method within the hyperspherical formalism. After introducing the theoretical framework, the method is applied first to the ${}^9$Be nucleus, showing a good agreement with the available data for its low-lying dipole response. Then, recent results on the structure and decay of the two-neutron emitters ${}^{26}$O and ${}^{16}$Be are presented. In particular, the role of the $\mathbf{n}$-$\mathbf{n}$ correlation in shaping their properties is discussed.

Comments: Proceedings of the 24th European Conference of Few-Body Problems in Physics (EFB24); SciPost contribution