19B isotope as a 17B-n-n three-body cluster close to unitary limit

TL;DR

This paper models the nucleus 19B as a three-body system near the unitary limit, successfully reproducing its ground state and predicting resonances, with implications for Efimov physics and other isotopes.

Contribution

It introduces a three-body cluster model for 19B near the unitary limit, extending to resonant states in 20,21B, and discusses Efimov physics connections.

Findings

Accurately reproduces 19B ground state energy

Predicts two low-lying resonances in 19B

Suggests links to Efimov physics phenomena

Abstract

We describe 19B in terms of a 17B-n-n three-body system, where the two-body subsystems 17B-n and n-n are unbound (virtual) states close to the unitary limit. The energy of 19B ground state is well reproduced and two low-lying resonances are predicted. Their eventual link with the Efimov physics is discussed. This model can be extended to describe the recently discovered resonant states in 20,21B.