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arXiv · 1304.4507

Search for $^{21}$C and constraints on $^{22}$C

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. Snyder·A. Spyrou·M. J. Strongman·M. Thoennessen
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Abstract

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

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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. Snyder, A. Spyrou, M. J. Strongman, M. Thoennessen. 2013-04-16. Search for $^{21}$C and constraints on $^{22}$C. https://doi.org/10.1016/j.nuclphysa.2013.04.004

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