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 \boldsymbol{^9}9Be 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 \boldsymbol{^{26}}26O and \boldsymbol{^{16}}16Be are presented. In particular, the role of the \boldsymbol{n}𝐧-\boldsymbol{n}𝐧 correlation in shaping their properties is discussed.