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arXiv · 2309.13128

Emergent inflation of the Efimov spectrum under three-body spin-exchange interactions

J. van de Kraats·D. J. M. Ahmed-Braun·J. -L. Li·S. J. J. M. F. Kokkelmans
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Abstract

We resolve the unexpected and long-standing disagreement between experiment and theory in the Efimovian three-body spectrum of Li-7, commonly referred to as the lithium few-body puzzle. Our results show that the discrepancy arises out of the presence of strong non-universal three-body spin-exchange interactions, which enact an effective inflation of the universal Efimov spectrum. This conclusion is obtained from a thorough numerical solution of the quantum mechanical three-body problem, including precise interatomic interactions and all spin degrees of freedom for three alkali-metal atoms. Our results show excellent agreement with the experimental data regarding both the Efimov spectrum and the absolute rate constants of three-body recombination, and in addition reveal a general product propensity for such triatomic reactions in the Paschen-Back regime, stemming from Wigner's spin conservation rule.

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J. van de Kraats, D. J. M. Ahmed-Braun, J. -L. Li, S. J. J. M. F. Kokkelmans. 2023-09-22. Emergent inflation of the Efimov spectrum under three-body spin-exchange interactions. https://doi.org/10.1103/physrevlett.132.133402

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