Evidence for the Ground-State Resonance of $^{26}\mathbf{O}$

Evidence for the Ground-State Resonance of ${}^{26}O$

E. Lunderberg, P. A. DeYoung, Z. Kohley, H. Attanayake, T. Baumann, D. Bazin, G. Christian, D. Divaratne, S. M. Grimes, A. Haagsma, J. E. Finck, N. Frank, B. Luther, S. Mosby, T. Nagi, G. F. Peaslee, A. Schiller, J. Snyder, A. Spyrou, M. J. Strongman, and M. Thoennessen

Phys. Rev. Lett. 108, 142503 – Published 6 April 2012

Abstract

Evidence for the ground state of the neutron-unbound nucleus ${}^{26}O$ was observed for the first time in the single proton-knockout reaction from a $82 MeV / u$ ${}^{27}F$ beam. Neutrons were measured in coincidence with ${}^{24}O$ fragments. ${}^{26}O$ was determined to be unbound by $150_{- 150}^{+ 50} keV$ from the observation of low-energy neutrons. This result agrees with recent shell-model calculations based on microscopic two- and three-nucleon forces.

Received 23 October 2011

DOI:https://doi.org/10.1103/PhysRevLett.108.142503

Authors & Affiliations

E. Lunderberg¹, P. A. DeYoung¹, Z. Kohley², H. Attanayake³, T. Baumann², D. Bazin², G. Christian^2,4, D. Divaratne³, S. M. Grimes³, A. Haagsma⁵, J. E. Finck⁵, N. Frank⁶, B. Luther⁷, S. Mosby^2,4, T. Nagi¹, G. F. Peaslee¹, A. Schiller³, J. Snyder^2,4, A. Spyrou^2,4, M. J. Strongman^2,4, and M. Thoennessen^2,4,*

¹Department of Physics, Hope College, Holland, Michigan 49423, USA
²National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
³Department of Physics & Astronomy, Ohio University, Athens, Ohio 45701, USA
⁴Department of Physics & Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
⁵Department of Physics, Central Michigan University, Mt. Pleasant, Michigan 48859, USA
⁶Department of Physics & Astronomy, Augustana College, Rock Island, Illinois 61201, USA
⁷Department of Physics, Concordia College, Moorhead, Minnesota 56562, USA