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

TL;DR

This paper employs the pseudostate method within the hyperspherical formalism to analyze weakly bound and unbound three-body nuclei, providing insights into their structure and decay, with applications to specific isotopes like 9Be, 26O, and 16Be.

Contribution

It introduces and applies a pseudostate method in hyperspherical coordinates to study three-body nuclear systems, including recent results on two-neutron emitters.

Findings

Good agreement with experimental data for 9Be dipole response.

Insights into n-n correlations affecting 26O and 16Be decay properties.

Analysis of continuum structures in three-body nuclei.

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