Unbound spectra of neutron-rich oxygen isotopes predicted by the Gamow shell model

The Gamow shell model has shown to efficiently describe weakly bound and unbound nuclear systems, as internucleon correlations and continuum coupling are both taken into account in this model. In the present work, we study neutron-dripline oxygen isotopes. It is hereby demonstrated that the presence of continuum coupling is important for the description of oxygen isotopes at dripline, and especially to assess the eventual bound or unbound character of O-28. Our results suggest that the ground state of O-28 is weakly unbound and is similar to O24-26 the narrow resonant O-26 ground state. Predictions of weakly bound and resonance excited states in are also provided. The asymptotes of the studied many-body states are analyzed via one-body densities, whereby the different radial properties of well bound, loosely bound, resonance states are clearly depicted.

Automated summary

The Gamow shell model efficiently describes weakly bound and unbound nuclear systems, as demonstrated in this study on neutron-dripline oxygen isotopes. Continuum coupling is found to be important for describing the isotopes, especially O-28, and predicting weakly bound and resonance excited states. The radial properties of the studied many-body states are clearly depicted through one-body density analysis.