{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"21c19b04f39e02589dfebb448ffa5b56363fed16a54c60b72a941ac99f51a09f","created":"2026-10-03T07:17:54Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"958b4af461e7c81cefe6b33d28a59a435ccd87c355e24742d586c15353aadbef","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"amo.ultracold-molecules.product-statistics","kind":"phenomenon","literature_status":"partially-resolved","n":"1","parents":[],"plain":"A reaction between two ultracold molecules produces new molecules in specific rotation states. Mostly the outcome looks random as statistics predicts, and the exceptions are not understood.","posed_since":"","precise":"Fully state-resolved reaction $\\mathrm{KRb} + \\mathrm{KRb} \\to \\mathrm{K2} + \\mathrm{Rb2}$ (and other bialkali reactions). Compare measured product rotational distributions P(N_K2, N_Rb2) with phase-space (statistical) theory and identify the mechanism of any deviations, including nuclear-spin conservation and long-range anisotropic forces. Answer: mechanism with predicted deviations for a second reaction.","problem_ref":null,"references":"","settled_by":"State-to-state measurements on a second reaction system that confirm a predicted pattern of deviations.","status_note":"A 2021 state-to-state study of KRb + KRb found product distributions largely consistent with statistical theory with deviations in some channels (Liu et al., Nature).","title":"When do ultracold reaction products depart from statistical 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