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.
Efimov, Force-range correction in the three-body problem: Application to three-nucleon systems, Phys
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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.