Non-Efimovian two-neutron halos with an $s$-wave core-neutron resonance

TL;DR

This paper develops an effective field theory approach to two-neutron halo nuclei with core-neutron resonances, revealing universal features without needing a three-body parameter and analyzing the impact of core mass, applied to ${}^{22}$C.

Contribution

It introduces a novel EFT framework for non-Efimovian two-neutron halos with core-neutron resonances, eliminating the need for a three-body parameter and exploring mass dependence.

Findings

Universal features identified for these systems.

No three-body parameter needed for predictions.

Application to ${}^{22}$C}

Abstract

We consider two-neutron halo nuclei in which the neutron core subsystem displays a resonance close to threshold. Such resonances can be generated in an effective field theory in which the scattering length and effective range are summed to all orders. We show that no three-body parameter is required to make predictions in this case and map out the universal features of such systems. We furthermore study the dependence of these universal features on the core mass. We apply our framework to the two-neutron halo nucleus ${}^{22}$C.