Beyond the neutron-drip line: two-neutron decay of unbound nuclei

TL;DR

This paper investigates the two-neutron decay of unbound nuclei beyond the neutron drip line, emphasizing the role of dineutron correlations in the emission process using a three-body model.

Contribution

It introduces a three-body model to analyze two-neutron decay and highlights the impact of dineutron correlations on emission patterns in unbound nuclei.

Findings

Back-to-back neutron emission is enhanced by dineutron correlation.

Dineutron correlation significantly influences decay dynamics.

The model clarifies the decay mechanism of unbound nuclei beyond the neutron drip line.

Abstract

We discuss a decay of unbound nuclei beyond the neutron drip-line using a three-body model with a core nucleus and two valence neutrons. We particularly discuss the role of dineutron correlation between the valence neutrons in the two-neutron emission from the ground state of $^{26}$O and $^{10}$He nuclei. Our calculations clearly indicate that the emission of the two neutrons in the back-to-back direction is enhanced due to the dineutron correlation.