{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2023:W5UEMXWAMJEOGDFQAMWFCUIAVS","short_pith_number":"pith:W5UEMXWA","schema_version":"1.0","canonical_sha256":"b768465ec06248e30cb0032c515100ac86241036c99c9373a76e52323943c7dd","source":{"kind":"arxiv","id":"2310.16445","version":1},"attestation_state":"computed","paper":{"title":"Search for particle-stable tetraneutrons in thermal fission of $^{235}$U","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"Hiroyuki Fujioka, Koichi Takamiya, Ryutaro Tomomatsu","submitted_at":"2023-10-25T08:10:04Z","abstract_excerpt":"Background: The existence of a tetraneutron comprising four neutrons has long been debated.\n  Purpose: Motivated by a recent observation of particle-stable tetraneutrons, we investigated potential particle-stable tetraneutron emission in thermal neutron-induced $^{235}$U fission using a nuclear research reactor.\n  Methods: We performed $\\gamma$-ray spectroscopy for a $^{88}$SrCO$_3$ sample irradiated in a reactor core. Stable $^{88}$Sr was expected to produce $^{91}$Sr by a tetraneutron-induced ($^4n$,n) reaction; hence, observation of $\\gamma$-rays followed by $\\beta$ decay of $^{91}$Sr would"},"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":"2310.16445","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2023-10-25T08:10:04Z","cross_cats_sorted":[],"title_canon_sha256":"eba69337852e4bd804e4b3e2e60c82209a9a8fb43679ca8cce82ab54aa2055e0","abstract_canon_sha256":"a28f254dba2936965f0b29e9d950075b939998d289906cb758be65afb379d342"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T07:15:17.110521Z","signature_b64":"16VA2sV4Yvn/iehFal1rkU/WENUSw1HvQIfhInryx9kzCBdbAjRSuz4nqhQrMW4xA8vp+URttBrhe3KX7oRuCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b768465ec06248e30cb0032c515100ac86241036c99c9373a76e52323943c7dd","last_reissued_at":"2026-07-05T07:15:17.108752Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T07:15:17.108752Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Search for particle-stable tetraneutrons in thermal fission of $^{235}$U","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"Hiroyuki Fujioka, Koichi Takamiya, Ryutaro Tomomatsu","submitted_at":"2023-10-25T08:10:04Z","abstract_excerpt":"Background: The existence of a tetraneutron comprising four neutrons has long been debated.\n  Purpose: Motivated by a recent observation of particle-stable tetraneutrons, we investigated potential particle-stable tetraneutron emission in thermal neutron-induced $^{235}$U fission using a nuclear research reactor.\n  Methods: We performed $\\gamma$-ray spectroscopy for a $^{88}$SrCO$_3$ sample irradiated in a reactor core. Stable $^{88}$Sr was expected to produce $^{91}$Sr by a tetraneutron-induced ($^4n$,n) reaction; hence, observation of $\\gamma$-rays followed by $\\beta$ decay of $^{91}$Sr would"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2310.16445","kind":"arxiv","version":1},"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/2310.16445/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":"2310.16445","created_at":"2026-07-05T07:15:17.108881+00:00"},{"alias_kind":"arxiv_version","alias_value":"2310.16445v1","created_at":"2026-07-05T07:15:17.108881+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2310.16445","created_at":"2026-07-05T07:15:17.108881+00:00"},{"alias_kind":"pith_short_12","alias_value":"W5UEMXWAMJEO","created_at":"2026-07-05T07:15:17.108881+00:00"},{"alias_kind":"pith_short_16","alias_value":"W5UEMXWAMJEOGDFQ","created_at":"2026-07-05T07:15:17.108881+00:00"},{"alias_kind":"pith_short_8","alias_value":"W5UEMXWA","created_at":"2026-07-05T07:15:17.108881+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/W5UEMXWAMJEOGDFQAMWFCUIAVS","json":"https://pith.science/pith/W5UEMXWAMJEOGDFQAMWFCUIAVS.json","graph_json":"https://pith.science/api/pith-number/W5UEMXWAMJEOGDFQAMWFCUIAVS/graph.json","events_json":"https://pith.science/api/pith-number/W5UEMXWAMJEOGDFQAMWFCUIAVS/events.json","paper":"https://pith.science/paper/W5UEMXWA"},"agent_actions":{"view_html":"https://pith.science/pith/W5UEMXWAMJEOGDFQAMWFCUIAVS","download_json":"https://pith.science/pith/W5UEMXWAMJEOGDFQAMWFCUIAVS.json","view_paper":"https://pith.science/paper/W5UEMXWA","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2310.16445&json=true","fetch_graph":"https://pith.science/api/pith-number/W5UEMXWAMJEOGDFQAMWFCUIAVS/graph.json","fetch_events":"https://pith.science/api/pith-number/W5UEMXWAMJEOGDFQAMWFCUIAVS/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/W5UEMXWAMJEOGDFQAMWFCUIAVS/action/timestamp_anchor","attest_storage":"https://pith.science/pith/W5UEMXWAMJEOGDFQAMWFCUIAVS/action/storage_attestation","attest_author":"https://pith.science/pith/W5UEMXWAMJEOGDFQAMWFCUIAVS/action/author_attestation","sign_citation":"https://pith.science/pith/W5UEMXWAMJEOGDFQAMWFCUIAVS/action/citation_signature","submit_replication":"https://pith.science/pith/W5UEMXWAMJEOGDFQAMWFCUIAVS/action/replication_record"}},"created_at":"2026-07-05T07:15:17.108881+00:00","updated_at":"2026-07-05T07:15:17.108881+00:00"}