Continuum and three-nucleon force in Borromean system: The 17Ne case

• Published in: Physics letters. B Vol. 808; no. C; p. 135673
• Main Authors: Ma, Y.Z., Xu, F.R., Michel, N., Zhang, S., Li, J.G., Hu, B.S., Coraggio, L., Itaco, N., Gargano, A.
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.09.2020; Elsevier
• Subjects: Borromean system; Continuum; Gamow shell model; Halo structure; NUCLEAR PHYSICS AND RADIATION PHYSICS; Three-nucleon force; Continuum; Three-nucleon force; Gamow shell model; Halo structure; Borromean system
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/j.physletb.2020.135673

Starting from chiral two-nucleon (2NF) and chiral three-nucleon (3NF) potentials, we present a detailed study of 17Ne, a Borromean system, with the Gamow shell model which can capture continuum effects. More precisely, we take advantage of the normal-ordering approach to include the 3NF and the Berggren representation to treat bound, resonant and continuum states on equal footing in a complex-momentum plane. In our framework, 3NF is essential to reproduce the Borromean structure of 17Ne, while the continuum is more crucial for the halo property of the nucleus. The two-proton halo structure is demonstrated by calculating the valence proton density and correlation density. The astrophysically interesting 3/2− excited state has its energy above the threshold of the proton emission, and therefore the two-proton decay should be expected from the state.