{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"4a89aa203f2ac70651e7783f7e0085566e284afec73411c6e1d0d0932a1c5954","created":"2026-10-03T07:17:53Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"0aba4a82eec0e0cc5dd228ccee99bf7025a46a9b5cd11acaec1b3e47561524a5","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"amo.efimov-universality.heteronuclear-three-body-parameter","kind":"well-posed","literature_status":"partially-resolved","n":"1","parents":[],"plain":"Mixtures of heavy and light atoms, such as cesium with lithium, have Efimov ladders with steps of about 5 instead of 22.7. Where these ladders start depends on how the two heavy atoms interact with each other, and a full predictive theory is missing.","posed_since":"","precise":"Heavy-heavy-light systems (Cs-Cs-Li-6 and other mass-imbalanced mixtures) near an interspecies Feshbach resonance, with interspecies van der Waals length r_vdW,HL and heavy-heavy scattering length $a_{\\mathrm{HH}}$. Predict the first Efimov resonance position a_-^(1)/r_vdW,HL as a function of $a_{\\mathrm{HH}}$ (including its sign) and resonance width, and the ratios between successive resonances. Answer: a model reproducing all measured values within error and predicting a new species pair.","problem_ref":null,"references":"","settled_by":"A three-body calculation with realistic potentials matching measured Efimov spectra for at least two heteronuclear mixtures and both signs of $a_{HH}$.","status_note":"Li-Cs experiments showed that the Efimov spectrum changes strongly with the sign of the Cs-Cs scattering length (Ulmanis et al., PRL 117, 153201, 2016; Hafner et al., PRA 95, 062708, 2017).","title":"Universality of the three-body parameter in heavy-heavy-light atom 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