Observation of a low-lying neutron-unbound state in 19C

Authors :: Thoennessen, M.
Mosby, S.
Badger, N. S.
Baumann, T.
Bazin, D.
Bennett, M.
Brown, J.
Christian, G.
DeYoung, P. A.
Finck, J. E.
Gardner, M.
Hook, E. A.
Luther, B.
Meyer, D. A.
Mosby, M.
Rogers, W. F.
Smith, J. K.
Spyrou, A.
Strongman, M. J.
Publication Year :: 2013
Abstract: Proton removal reactions from a secondary 22N beam were utilized to populate unbound states in neutron-rich 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 18C+n corresponding to a state in 19C 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 1n and 2n removal cross section measurements from 20C.<br />Comment: accepted for publication in Nucl. Phys. A

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