Search For C-21 And Constraints On C-22

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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 decay-energy spectrum could be described with an s-wave line shape with a scattering length limit of |as|22C is bound by less than 70 keV.