{"schema":"pubphys.bundle/1","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 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