{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.topic/1","content_sha256":"39cadb6bdbb95253b74b2e46c968859f60d70a57503d20038965e8570ee5f2d2","created":"2026-10-03T07:17:52Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":[],"salt":"e1958293abab6a545c44648e70aa4590209a1f63814a3cb0b18859f36db254ae","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"topic"},"content":{"external_id":"nuc.precision-anomalies","field":"nuc","n":"1","review_cite":"Wietfeldt, Greene, Colloquium: The neutron lifetime, Reviews of Modern Physics, 2011","review_link":"https://doi.org/10.1103/RevModPhys.83.1173","review_verified":"true","summary":"A free neutron decays into a proton, an electron and an antineutrino in about 15 minutes, but two measuring methods disagree by about 9 seconds. Other low-energy puzzles include a reported $17\\,\\mathrm{MeV}$ particle seen in nuclear decays and a small deficit in quark-mixing measurements from nuclear $\\beta$ decays.","title":"Neutron lifetime and low-energy nuclear anomalies","topic_ref":null,"why":"These precision quantities test the weak interaction and could reveal new particles, so either a new effect or a hidden experimental error must be found."},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"68930a0e96cfb6023c51ad2da3d1ea500482dc0e5e690cd3ea4398d0ad9ecbec","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"31efc7ea4bcb880689976935c5223a8e7de6659c353fb052aa0aa37c94c8914d","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"E0pidmsBiOs2gEZEmGVk0TlnqThuspj5T0JzHvqV1fP6BwLzXLpRJE5_dXjk_ZmgZ3hYA8kX127eVBvuEZGQAw"},"schema":"pubphys.envelope/1"},"record_hash":"68930a0e96cfb6023c51ad2da3d1ea500482dc0e5e690cd3ea4398d0ad9ecbec","leaf_index":290}