We apply the Gamow shell model to study ${}^{25–31}\mathrm{F}$ isotopes. As both internucleon correlations and continuum coupling are properly treated therein, the structure shape of ${}^{31}\mathrm{F}$ at large distance can be analyzed precisely. For this, one-nucleon densities, root-mean-square radii, and correlation densities are calculated in neutron-rich fluorine isotopes. It is then suggested that ${}^{31}\mathrm{F}$ exhibits a two-neutron halo structure, built from both continuum coupling and nucleon-nucleon correlations.

• Received 25 July 2019
• Revised 14 January 2020
• Accepted 11 February 2020

DOI:https://doi.org/10.1103/PhysRevC.101.031301