{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2025:FSCQHGM4XN275WPTAPNBEIT6NW","short_pith_number":"pith:FSCQHGM4","schema_version":"1.0","canonical_sha256":"2c8503999cbb75fed9f303da12227e6d911899ba73ff3a86575150ee79a7d00a","source":{"kind":"arxiv","id":"2507.17955","version":3},"attestation_state":"computed","paper":{"title":"Constraints on millicharged particles from nuclear gamma-decays","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["hep-ex","nucl-th"],"primary_cat":"hep-ph","authors_text":"Maxim Pospelov, Ting Gao","submitted_at":"2025-07-23T21:56:48Z","abstract_excerpt":"We consider nuclear gamma decays and $\\gamma$-emitting reactions that can be an efficient source of hypothetical millicharged particles ($\\chi$). In particular, we revisit the production of millicharged particles in nuclear reactor environment, pointing out that $\\gamma$ cascades from $^{239}$U is an overlooked yet a powerful source of $\\chi\\bar\\chi$ pairs. This leads to an increased flux compared to previous studies. We then apply new estimates of the flux to derive novel limits on the value of millicharge, $\\varepsilon = Q_\\chi/e$, from the electron recoil searched for in a variety of experi"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2507.17955","kind":"arxiv","version":3},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2025-07-23T21:56:48Z","cross_cats_sorted":["hep-ex","nucl-th"],"title_canon_sha256":"587715a878fbb4aa672eb9e7126e232af314f5980a85453ee96448342496bfd1","abstract_canon_sha256":"fcd2bb12699ea06757712c6db9fd943c613903c45a32bd1964663ec84ec49f57"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-19T16:12:46.891966Z","signature_b64":"iLrRmz604jOrzRoyngBNAUPDHwB4iWzWrqvueMXLW8t5KrSzgQnVY+X0emPJ3X+BjtY/I9rkUss3A6+iHx1aDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2c8503999cbb75fed9f303da12227e6d911899ba73ff3a86575150ee79a7d00a","last_reissued_at":"2026-06-19T16:12:46.891542Z","signature_status":"signed_v1","first_computed_at":"2026-06-19T16:12:46.891542Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Constraints on millicharged particles from nuclear gamma-decays","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["hep-ex","nucl-th"],"primary_cat":"hep-ph","authors_text":"Maxim Pospelov, Ting Gao","submitted_at":"2025-07-23T21:56:48Z","abstract_excerpt":"We consider nuclear gamma decays and $\\gamma$-emitting reactions that can be an efficient source of hypothetical millicharged particles ($\\chi$). In particular, we revisit the production of millicharged particles in nuclear reactor environment, pointing out that $\\gamma$ cascades from $^{239}$U is an overlooked yet a powerful source of $\\chi\\bar\\chi$ pairs. This leads to an increased flux compared to previous studies. We then apply new estimates of the flux to derive novel limits on the value of millicharge, $\\varepsilon = Q_\\chi/e$, from the electron recoil searched for in a variety of experi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.17955","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2507.17955/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"2507.17955","created_at":"2026-06-19T16:12:46.891601+00:00"},{"alias_kind":"arxiv_version","alias_value":"2507.17955v3","created_at":"2026-06-19T16:12:46.891601+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2507.17955","created_at":"2026-06-19T16:12:46.891601+00:00"},{"alias_kind":"pith_short_12","alias_value":"FSCQHGM4XN27","created_at":"2026-06-19T16:12:46.891601+00:00"},{"alias_kind":"pith_short_16","alias_value":"FSCQHGM4XN275WPT","created_at":"2026-06-19T16:12:46.891601+00:00"},{"alias_kind":"pith_short_8","alias_value":"FSCQHGM4","created_at":"2026-06-19T16:12:46.891601+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":2,"internal_anchor_count":2,"sample":[{"citing_arxiv_id":"2606.08487","citing_title":"Probing Dark Photons from Nuclear De-excitation in Reactor Neutrino Experiment","ref_index":51,"is_internal_anchor":true},{"citing_arxiv_id":"2602.15960","citing_title":"Novel Constraints on Spin-Dependent Light Dark Matter Scattering","ref_index":21,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/FSCQHGM4XN275WPTAPNBEIT6NW","json":"https://pith.science/pith/FSCQHGM4XN275WPTAPNBEIT6NW.json","graph_json":"https://pith.science/api/pith-number/FSCQHGM4XN275WPTAPNBEIT6NW/graph.json","events_json":"https://pith.science/api/pith-number/FSCQHGM4XN275WPTAPNBEIT6NW/events.json","paper":"https://pith.science/paper/FSCQHGM4"},"agent_actions":{"view_html":"https://pith.science/pith/FSCQHGM4XN275WPTAPNBEIT6NW","download_json":"https://pith.science/pith/FSCQHGM4XN275WPTAPNBEIT6NW.json","view_paper":"https://pith.science/paper/FSCQHGM4","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2507.17955&json=true","fetch_graph":"https://pith.science/api/pith-number/FSCQHGM4XN275WPTAPNBEIT6NW/graph.json","fetch_events":"https://pith.science/api/pith-number/FSCQHGM4XN275WPTAPNBEIT6NW/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/FSCQHGM4XN275WPTAPNBEIT6NW/action/timestamp_anchor","attest_storage":"https://pith.science/pith/FSCQHGM4XN275WPTAPNBEIT6NW/action/storage_attestation","attest_author":"https://pith.science/pith/FSCQHGM4XN275WPTAPNBEIT6NW/action/author_attestation","sign_citation":"https://pith.science/pith/FSCQHGM4XN275WPTAPNBEIT6NW/action/citation_signature","submit_replication":"https://pith.science/pith/FSCQHGM4XN275WPTAPNBEIT6NW/action/replication_record"}},"created_at":"2026-06-19T16:12:46.891601+00:00","updated_at":"2026-06-19T16:12:46.891601+00:00"}