Two-neutron halo structure and anti-halo effect in 31F

TL;DR

This paper investigates the structure of the nucleus 31F, revealing how neutron pairing and single-particle energies influence its halo characteristics and demonstrating an anti-halo effect that suppresses halo formation.

Contribution

It provides a detailed three-body model analysis of 31F, highlighting the anti-halo effect and the interplay of pairing and single-particle energies in halo nuclei.

Findings

Calculated radius and reaction cross-section for 31F

Identified anti-halo effect suppressing halo structure

Clarified the role of neutron pairing in nuclear structure

Abstract

We perform a detailed analysis for the structure of 31F, which is a candidate of the halo nucleus. We calculate the radius and reaction cross-section using a three-body model of 29F+n+n and discuss how the competition between the neutron-pairing and the single-particle energy induces structural changes of 31F. The present analysis further clarifies a new aspect of the anti-halo efect that suppresses the halo structure.