{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:W5UEMXWAMJEOGDFQAMWFCUIAVS","short_pith_number":"pith:W5UEMXWA","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"},"canonical_sha256":"b768465ec06248e30cb0032c515100ac86241036c99c9373a76e52323943c7dd","source":{"kind":"arxiv","id":"2310.16445","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2310.16445","created_at":"2026-07-05T07:15:17Z"},{"alias_kind":"arxiv_version","alias_value":"2310.16445v1","created_at":"2026-07-05T07:15:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2310.16445","created_at":"2026-07-05T07:15:17Z"},{"alias_kind":"pith_short_12","alias_value":"W5UEMXWAMJEO","created_at":"2026-07-05T07:15:17Z"},{"alias_kind":"pith_short_16","alias_value":"W5UEMXWAMJEOGDFQ","created_at":"2026-07-05T07:15:17Z"},{"alias_kind":"pith_short_8","alias_value":"W5UEMXWA","created_at":"2026-07-05T07:15:17Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:W5UEMXWAMJEOGDFQAMWFCUIAVS","target":"record","payload":{"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"},"canonical_sha256":"b768465ec06248e30cb0032c515100ac86241036c99c9373a76e52323943c7dd","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"},"source_kind":"arxiv","source_id":"2310.16445","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T07:15:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wpqEKTFtBupt2Yjuf6VWX6wxb0rTVr3P3qaEyWc+J7ogbwPu3vhndn2tyJ4fkvQkLMTC3+Qizb02bfeZ3HcDAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-09T05:43:23.261784Z"},"content_sha256":"ce55e4ca58731f7bfbe71539b8dca547b0726ba7637c7ba81b024f01cd02e9ae","schema_version":"1.0","event_id":"sha256:ce55e4ca58731f7bfbe71539b8dca547b0726ba7637c7ba81b024f01cd02e9ae"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:W5UEMXWAMJEOGDFQAMWFCUIAVS","target":"graph","payload":{"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T07:15:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8L7GjXI2rP89b3zP7Rub8KckK+vyXMCNS8AOqvSsSolDfm6kKB8Lg+UWFT35EtfChGzCJScKJcxIHPBzvSZwAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-09T05:43:23.262163Z"},"content_sha256":"e73039972f22366caafd0f50622b7b88c405dd4c149a8008356e3ed61b5998ff","schema_version":"1.0","event_id":"sha256:e73039972f22366caafd0f50622b7b88c405dd4c149a8008356e3ed61b5998ff"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/W5UEMXWAMJEOGDFQAMWFCUIAVS/bundle.json","state_url":"https://pith.science/pith/W5UEMXWAMJEOGDFQAMWFCUIAVS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/W5UEMXWAMJEOGDFQAMWFCUIAVS/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-07-09T05:43:23Z","links":{"resolver":"https://pith.science/pith/W5UEMXWAMJEOGDFQAMWFCUIAVS","bundle":"https://pith.science/pith/W5UEMXWAMJEOGDFQAMWFCUIAVS/bundle.json","state":"https://pith.science/pith/W5UEMXWAMJEOGDFQAMWFCUIAVS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/W5UEMXWAMJEOGDFQAMWFCUIAVS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:W5UEMXWAMJEOGDFQAMWFCUIAVS","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"a28f254dba2936965f0b29e9d950075b939998d289906cb758be65afb379d342","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2023-10-25T08:10:04Z","title_canon_sha256":"eba69337852e4bd804e4b3e2e60c82209a9a8fb43679ca8cce82ab54aa2055e0"},"schema_version":"1.0","source":{"id":"2310.16445","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2310.16445","created_at":"2026-07-05T07:15:17Z"},{"alias_kind":"arxiv_version","alias_value":"2310.16445v1","created_at":"2026-07-05T07:15:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2310.16445","created_at":"2026-07-05T07:15:17Z"},{"alias_kind":"pith_short_12","alias_value":"W5UEMXWAMJEO","created_at":"2026-07-05T07:15:17Z"},{"alias_kind":"pith_short_16","alias_value":"W5UEMXWAMJEOGDFQ","created_at":"2026-07-05T07:15:17Z"},{"alias_kind":"pith_short_8","alias_value":"W5UEMXWA","created_at":"2026-07-05T07:15:17Z"}],"graph_snapshots":[{"event_id":"sha256:e73039972f22366caafd0f50622b7b88c405dd4c149a8008356e3ed61b5998ff","target":"graph","created_at":"2026-07-05T07:15:17Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2310.16445/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"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","authors_text":"Hiroyuki Fujioka, Koichi Takamiya, Ryutaro Tomomatsu","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2023-10-25T08:10:04Z","title":"Search for particle-stable tetraneutrons in thermal fission of $^{235}$U"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2310.16445","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:ce55e4ca58731f7bfbe71539b8dca547b0726ba7637c7ba81b024f01cd02e9ae","target":"record","created_at":"2026-07-05T07:15:17Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"a28f254dba2936965f0b29e9d950075b939998d289906cb758be65afb379d342","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2023-10-25T08:10:04Z","title_canon_sha256":"eba69337852e4bd804e4b3e2e60c82209a9a8fb43679ca8cce82ab54aa2055e0"},"schema_version":"1.0","source":{"id":"2310.16445","kind":"arxiv","version":1}},"canonical_sha256":"b768465ec06248e30cb0032c515100ac86241036c99c9373a76e52323943c7dd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b768465ec06248e30cb0032c515100ac86241036c99c9373a76e52323943c7dd","first_computed_at":"2026-07-05T07:15:17.108752Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T07:15:17.108752Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"16VA2sV4Yvn/iehFal1rkU/WENUSw1HvQIfhInryx9kzCBdbAjRSuz4nqhQrMW4xA8vp+URttBrhe3KX7oRuCg==","signature_status":"signed_v1","signed_at":"2026-07-05T07:15:17.110521Z","signed_message":"canonical_sha256_bytes"},"source_id":"2310.16445","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ce55e4ca58731f7bfbe71539b8dca547b0726ba7637c7ba81b024f01cd02e9ae","sha256:e73039972f22366caafd0f50622b7b88c405dd4c149a8008356e3ed61b5998ff"],"state_sha256":"b2f75dbab1d84a8917bba787ed71604bb27826ba93d9fbe2ad4228bb3c742221"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"shd5XdXE95fzy8imip7XFdd00mJKu5/XWMsCAdPB+jmI6Anl/G39aZrORVLHgFZjNO7xSPtu/2Sj47gC8H6+DQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-09T05:43:23.264689Z","bundle_sha256":"f3309897c5fec7c6789932e9d4c0c18b536d6d4577f9faa2f7b97798ffafc426"}}