Continuum effects in neutron-drip-line oxygen isotopes
Abstract
The binding-energy pattern along the neutron-rich oxygen chain, governed by an interplay between shell effects and many-body correlations impacted by strong couplings to one- and two-neutron continuum, make these isotopes a unique testing ground for nuclear models. In this work, we investigate ground states and low-lying excited states of O using the complex-energy Gamow Shell Model and Density Matrix Renormalization Group method with a finite-range two-body interaction optimized to the bound states and resonances of O, assuming a core of O. Our results suggest that the ground-state of O has a threshold character, i.e., is very weakly bound or slightly unbound. We also predict narrow excited resonances in O and O. The inclusion of the large continuum space significantly impacts predicted binding energies of O. This implies that the careful treatment of neutron continuum is necessary prior to assessing the spectroscopic quality of effective interactions in this region.
Cite
@article{arxiv.1704.03785,
title = {Continuum effects in neutron-drip-line oxygen isotopes},
author = {K. Fossez and J. Rotureau and N. Michel and W. Nazarewicz},
journal= {arXiv preprint arXiv:1704.03785},
year = {2017}
}