{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"c96edf329f028c3c71473de7a881dfe4bb41a5161262bc167ace02a8e649ea4f","created":"2026-10-03T07:18:05Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["1b32ad92d06914bc07abfbf37a6e7047a2c33a479e25fe7034faf994e72b2dcc","5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"35b996a4bb0516068b55041799f1cd2ac658d808af5f01288d4de597dc48fd46","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"hep.low-energy-excess.time-dependence","kind":"well-posed","literature_status":"open","n":"1","parents":[{"note":"","parent_revision":"1b32ad92d06914bc07abfbf37a6e7047a2c33a479e25fe7034faf994e72b2dcc","relation":"special_case"}],"plain":"The excess fades in the weeks and months after a detector is cooled and partly returns if it is warmed and cooled again. The precise shape of this fading is a clue to its cause.","posed_since":"","precise":"Let $R(t)$ be the excess event rate above threshold at time $t$ after the end of cooldown. Data from CRESST-III and NUCLEUS have been described by sums of exponentials with time constants of tens to hundreds of days and by power laws $R \\sim t^{-\\alpha}$. The question is the functional form of $R(t)$, its dependence on cooldown rate and on the maximum temperature of an intermediate warm-up, and whether these match a relaxation model (e.g., a distribution of activation barriers in a glassy stress or defect system).","problem_ref":null,"references":"","settled_by":"Long continuous runs on identical detectors with controlled cooldown rates and warm-up temperatures, fitted against competing relaxation models.","status_note":"NUCLEUS (Eur. Phys. J. C 86, 831, 2026) found $R(t)$ best described by a power law with common exponent $-0.59 \\pm 0.06$, with $t$ measured from reaching 4 K, and lower initial rates after slower cooldown.","title":"What law governs the decay and reset of the excess 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