Evidence for the ground-state resonance of 26O
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. Nagy, G.F. Peaslee, A. Schiller, J. Snyder, A., Spyrou, M.J. Strongman, and M. Thoennessen
TL;DR
This paper reports the first experimental evidence of the ground state of the unbound nucleus 26O, measured via proton-knockout reactions, confirming theoretical predictions about its unbound nature and energy level.
Contribution
First experimental observation of 26O's ground state, validating recent shell model calculations with microscopic forces.
Findings
26O is unbound by approximately 150 keV
Neutrons are observed in coincidence with 24O fragments
Results agree with shell model predictions
Abstract
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.
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