Search for 21 C and constraints on 22 C

S Mosby, N S Badger,T Baumann,D Bazin,Michael I Bennett,John C Brown,G Christian,Paul A Deyoung,J E Finck,Murray B Gardner,J D Hinnefeld, E A Hook,E Lunderberg,B Luther,D A Meyer,M Mosby,Graham F Peaslee,W F Rogers,Jana Kay Smith, Jeanne M Snyder,A Spyrou,M J Strongman,M Thoennessen

Nuclear Physics A（2013）

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摘要

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 |as|<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.

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关键词

Nuclear reactions,measured,21,22C calculated,21C deduced,C20+n deduced

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