{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"1f84870350f9e493ab1aed5f79308cedb30b08d154a1a8881e8a2f3d054b704e","created":"2026-10-03T07:18:07Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"e1fcf7672b2b8acdc8ce1950133c423fc3f6940d6b1dcdb3285aa69158c03ddd","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"nuc.double-beta-nme.ga-quenching-momentum","kind":"well-posed","literature_status":"partially-resolved","n":"1","parents":[],"plain":"Simple nuclear models overpredict ordinary beta-decay rates unless the weak axial coupling $g_{\\mathrm{A}}$ is reduced by about 25 percent, a correction called quenching. First-principles work explains this with two-nucleon currents and correlations, but whether the same reduction applies to neutrinoless decay, where momenta are about $100\\ \\mathrm{MeV}/c$, is unknown.","posed_since":"","precise":"Gamow-Teller quenching at momentum transfer $q \\to 0$ (effective $g_{A} \\text{ about } 0.75 \\text{ times } g_{A} = 1.2754$) was reproduced ab initio by two-body currents and correlations (Gysbers et al., Nature Physics 15, 428, 2019). Determine the effective renormalization of the axial operator at $q \\text{ about } 100 \\text{ to } 200\\,\\mathrm{MeV}/c$, relevant to 0nubb, in the same nuclei. Answer: the ratio of $M^{0\\nu}$ with and without two-body currents and correlations, with uncertainty.","problem_ref":null,"references":"","settled_by":"Ab initio computations of muon capture and forbidden beta decays (which probe $q$ about 100 MeV/c) compared with data, then applied to the 0nubb operator.","status_note":"The $q \\to 0$ quenching has been considered explained since 2019; its momentum dependence remained open as of 2026.","title":"Does axial-coupling quenching persist at neutrinoless decay momentum transfers?","topic_ref":"4f4c723b8298474d47f16416d8eb15f7bae4b6a7810849f79c8cbc3d0064c494"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"c335922b74ba673b6d05f71f54792b8c806f26ca212849169e4e112e57fb1764","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"ef0e37ba6c1793d32d6ab205f71d89599df06e56eb98e40591f16b2cc7838c70","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"9TZtbL41M8gPvXcg_Ndkmue9FKorV7-_b_qm6PSTX2gnIQHrErseXs4ojWhrN_7LFXZ7Qf2Rcmd9h70dDcqaDw"},"schema":"pubphys.envelope/1"},"record_hash":"c335922b74ba673b6d05f71f54792b8c806f26ca212849169e4e112e57fb1764","leaf_index":1738}