Search for 21C and constraints on 22C

S. Mosby*, N. S. Badger, T. Baumann, D. Bazin, M. Bennett, J. Brown, G. Christian, P. A. DeYoung, J. E. Finck, M. Gardner, J. D. Hinnefeld, E. A. Hook, E. M. Lunderberg, B. Luther, D. A. Meyer, M. Mosby, G. F. Peaslee, W. F. Rogers, J. K. Smith, J. SnyderA. Spyrou, M. J. Strongman, M. Thoennessen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


A search for the neutron-unbound nucleus 21C was performed via the single-proton removal reaction from a beam of 22N at 68 MeV/u. Neutrons were detected with the Modular Neutron Array (MoNA) in coincidence with 20C fragments. No evidence for a low-lying state was found, and the reconstructed C20+n decay-energy spectrum could be described with an s-wave line shape with a scattering length limit of |a s| < 2.8fm, consistent with shell-model predictions. A comparison with a renormalized zero-range three-body model suggests that 22C is bound by less than 70 keV.

Original languageEnglish (US)
Pages (from-to)69-78
Number of pages10
JournalNuclear Physics A
StatePublished - Jul 1 2013
Externally publishedYes


  • C calculated
  • C deduced
  • C20+n deduced
  • Measured
  • Nuclear reactions

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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