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, 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
TL;DR
This study used proton removal reactions to identify a low-lying neutron-unbound state in 19C, providing insights into its nuclear structure and confirming theoretical predictions about unbound states.
Contribution
It reports the first observation of a neutron-unbound state in 19C, advancing understanding of neutron-rich carbon isotopes and their unbound states.
Findings
Resonance at 76 keV decay energy in 18C+n system
Corresponds to an excited state in 19C at 653 keV
Supports the existence of an unbound 5/2+ state in 19C
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.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.