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

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arxiv 1304.4507 v1 pith:3VCWAQWM submitted 2013-04-16 nucl-ex

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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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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  1. Non-Efimovian two-neutron halos with an $s$-wave core-neutron resonance

    nucl-th 2025-07 conditional novelty 6.0 of 10

    Two-neutron halos with a near-threshold s-wave core-neutron resonance need no three-body parameter: two-body input fixes the halo, and applying the framework to carbon-22 rules out the reported 0.8 MeV resonance as to...

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