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Chiral three-nucleon force and continuum for dripline nuclei and beyond

Authors :
Y.Z. Ma
F.R. Xu
L. Coraggio
B.S. Hu
J.G. Li
T. Fukui
L. De Angelis
N. Itaco
A. Gargano
Source :
Physics Letters B, Vol 802, Iss , Pp - (2020)
Publication Year :
2020
Publisher :
Elsevier, 2020.

Abstract

Three-nucleon force and continuum play important roles in reproducing the properties of atomic nuclei around driplines. Therefore it is valuable to build up a theoretical framework where both effects can be taken into account to solve the nuclear Schrödinger equation. To this end, in this letter, we have expressed the chiral three-nucleon force within the continuum Berggren representation, so that bound, resonant and continuum states can be treated on an equal footing in the complex-momentum space. To reduce the model dimension and computational cost, the three-nucleon force is truncated at the normal-ordered two-body level and limited in the sd-shell model space, with the residual three-body term being neglected. We choose neutron-rich oxygen isotopes as the test ground because they have been well studied experimentally, with the neutron dripline determined. The calculations have been carried out within the Gamow shell model. The quality of our results in reproducing the properties of oxygen isotopes around the neutron dripline shows the relevance of the interplay between three-nucleon force and the coupling to continuum states. We also analyze the role played by the chiral three-nucleon force, by dissecting the contributions of the 2π exchange, 1π exchange and contact terms. Keywords: Three-nucleon forces, Continuum, Gamow shell model, Unstable nuclei, Binding energy, Spectra

Subjects

Subjects :
Physics
QC1-999

Details

Language :
English
ISSN :
03702693
Volume :
802
Issue :
-
Database :
Directory of Open Access Journals
Journal :
Physics Letters B
Publication Type :
Academic Journal
Accession number :
edsdoj.7550249ed80c442d897ac8ef7d7da063
Document Type :
article
Full Text :
https://doi.org/10.1016/j.physletb.2020.135257