{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"93e8b246878c61f3495ccf4aaa3954e01b676da1d28e9c3b3d9b2e2af6da5b0f","created":"2026-10-03T07:17:53Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"c18aa4105c65e09abc168bb22d0e9ded40a796083fb4c389f2b38f7e5ab958fd","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"amo.efimov-universality.efimov-scaling-ratio","kind":"well-posed","literature_status":"partially-resolved","n":"1","parents":[],"plain":"Ideal theory says each Efimov molecule is 22.7 times larger than the previous one. Measurements in cesium gave a smaller ratio, and the size of the correction is not pinned down.","posed_since":"","precise":"For identical bosons, the zero-range ratio a_-^(2)/a_-^(1) = exp(pi/s_0) = 22.7 with $s_0 = 1.00624$. Measure the ratio to 2% in a species other than Cs and compute the finite-range correction from realistic van der Waals potentials. Answer: measured and predicted ratios agreeing within errors.","problem_ref":null,"references":"","settled_by":"Observation of the second Efimov resonance in a second bosonic species with percent-level precision, compared with a calculation using the measured interatomic potential.","status_note":"A 2014 cesium measurement gave a ratio of about 21.0(1.3) (Huang et al., PRL); no second homonuclear species has been measured at comparable precision.","title":"Finite-range corrections to the Efimov scaling factor 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