Observation Of A Low-lying Neutron-unbound State In C-19
Proton removal reactions from a secondary N-22 beam were utilized to populate unbound states in neutronrich carbon isotopes. Neutrons were measured with the Modular Neutron Array (MoNA) in coincidence with carbon fragments. A resonance with a decay energy of 76(14) keV was observed in the system C-18 + n corresponding to a state in C-19 at an excitation energy of 653(95) keV. This resonance could correspond to the first 5/2(+) state which was recently speculated to be unbound in order to describe In and 2n removal cross section measurements from C-20. (C) 2013 Elsevier B.V. All rights reserved.
Thoennessen, M., S. Mosby, N. S. Badger, T. Baumann, D. Bazin, M. Bennett, J. Brown, G. Christian, Paul A. DeYoung, J. E. Finck, M. Gardner, E. A. Hook, B. Luther, D. A. Meyer, M. Mosby, W. F. Rogers, J. K. Smith, A. Spyrou and M. J. Strongman. "Observation of a Low-Lying Neutron-Unbound State in C-19." Nuclear Physics A 912, (2013): 1-6.