Title

Observation Of A Low-lying Neutron-unbound State In C-19

Document Type

Article

Publication Date

8-21-2013

Abstract

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.