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

M. Thoennessen , S. Mosby , N. S. Badger , T. Baumann , D. Bazin , M. Bennett , J. Brown , G. Christian

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P. 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 M. J. Strongman

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classification ⚛️ nucl-ex

keywords statecarbonenergyremovalresonanceunboundwerearray

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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.

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

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