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Observability of modified threshold behavior near unitarity
Michael D. Higgins, J. Golak, R. Skibinski, K. Topolnicki, H. Witala, H. Kamada, Chris H. Greene
https://arxiv.org/abs/2505.24569

Observability of modified threshold behavior near unitarity
A number of recent references have pointed out that an N-particle system having short-range interactions at S-wave and/or P-wave unitarity can exhibit modified threshold behavior for various reactive processes. But the question of how close to unitarity one must get in order to observe such modifications has not been addressed. The present study quantities this question by treating cases involving 3- or 4-neutrons, at the physical value of the neutron-neutron singlet scattering length a and at …