{"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 22.7","topic_ref":"339b6d63b4f6e3414be07628eacf49cfd6937fceb21d43c10a8b4202c093ede0"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"4e9bd801bc46e74f5a028789c99f7467401a6def33be30019676f8a6f925fff1","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"525a7475b18ceb3b2e941a40c18593d2535b6e1259fd1ae4f47fa2d4580b8b5f","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"PeB_sDzf3aecClgvld2uLLzyhsaeu4HTD7ljwrCtLmyGx6o4GWUm0UnMtDijVjZQC7XCDnCYV0Sr2SBnB5vQDg"},"schema":"pubphys.envelope/1"},"record_hash":"4e9bd801bc46e74f5a028789c99f7467401a6def33be30019676f8a6f925fff1","leaf_index":400}