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 too narrow.
Search for $^{21}$C and constraints on $^{22}$C
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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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Non-Efimovian two-neutron halos with an $s$-wave core-neutron resonance
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 too narrow.