Evidence for the ground state of the neutron-unbound nucleus 26O was observed for the first time in the single proton-knockout reaction from a 82 MeV/u 27F beam. Neutrons were measured in coincidence with 24O fragments. 26O was determined to be unbound by 150+50-150 keV from the observation of low-energy neutrons. This result agrees with recent shell model calculations based on microscopic two- and three-nucleon forces.
@article{arxiv.1202.3973,
title = {Evidence for the ground-state resonance of 26O},
author = {E. Lunderberg and P. A. DeYoung and Z. Kohley and H. Attanayake and T. Baumann and D. Bazin and G. Christian and D. Divaratne and S. M. Grimes and A. Haagsma and J. E. Finck and N. Frank and B. Luther and S. Mosby and T. Nagy and G. F. Peaslee and A. Schiller and J. Snyder and A. Spyrou and M. J. Strongman and M. Thoennessen},
journal= {arXiv preprint arXiv:1202.3973},
year = {2015}
}