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

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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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classification ⚛️ nucl-ex

keywords modelsearcharraybeamboundcoincidencecomparisonconsistent

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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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Search for ²¹C and constraints on ²²C

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