{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:MM35SJQZMU2DA65QXAYCEQRSNC","short_pith_number":"pith:MM35SJQZ","canonical_record":{"source":{"id":"1907.05413","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2019-07-11T17:56:46Z","cross_cats_sorted":[],"title_canon_sha256":"ef1b4d791fc94257466f330132bfae0414781e0d5305f479d016e1786f1f2e74","abstract_canon_sha256":"10c6c089344cd7d5ec22d066c76051c30f3d3059b62d473ffc5a683ba74eccbc"},"schema_version":"1.0"},"canonical_sha256":"6337d926196534307bb0b83022423268b565daf858163869800381f910d55a72","source":{"kind":"arxiv","id":"1907.05413","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.05413","created_at":"2026-05-17T23:40:50Z"},{"alias_kind":"arxiv_version","alias_value":"1907.05413v1","created_at":"2026-05-17T23:40:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.05413","created_at":"2026-05-17T23:40:50Z"},{"alias_kind":"pith_short_12","alias_value":"MM35SJQZMU2D","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_16","alias_value":"MM35SJQZMU2DA65Q","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_8","alias_value":"MM35SJQZ","created_at":"2026-05-18T12:33:21Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:MM35SJQZMU2DA65QXAYCEQRSNC","target":"record","payload":{"canonical_record":{"source":{"id":"1907.05413","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2019-07-11T17:56:46Z","cross_cats_sorted":[],"title_canon_sha256":"ef1b4d791fc94257466f330132bfae0414781e0d5305f479d016e1786f1f2e74","abstract_canon_sha256":"10c6c089344cd7d5ec22d066c76051c30f3d3059b62d473ffc5a683ba74eccbc"},"schema_version":"1.0"},"canonical_sha256":"6337d926196534307bb0b83022423268b565daf858163869800381f910d55a72","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:40:50.303290Z","signature_b64":"OG+8NEZjzdqOp3tYx3TE/v48TmefCs0SOtsx9SJtMx8ug3t2gyc10NiqMOKAy7KappT9TGxoqm9xuNmbL6b6Dw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6337d926196534307bb0b83022423268b565daf858163869800381f910d55a72","last_reissued_at":"2026-05-17T23:40:50.302646Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:40:50.302646Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1907.05413","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":"2026-05-17T23:40:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/tEwOunuAhd91MFMsj2nY+RQaP0ZXBKcGdmnb1GR+MAbYtbC7x586i03VitGHDHkIX5v90nm7tb3ZoNQKrdvCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T13:21:36.589063Z"},"content_sha256":"f8b23e9f44336afab24c43389befe0bed86aa9315f17eb2f3aba04fcfd40e375","schema_version":"1.0","event_id":"sha256:f8b23e9f44336afab24c43389befe0bed86aa9315f17eb2f3aba04fcfd40e375"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:MM35SJQZMU2DA65QXAYCEQRSNC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Two Neutron Correlation Study in Photofission of Actinides","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"Roman V. Shapovalov","submitted_at":"2019-07-11T17:56:46Z","abstract_excerpt":"It is well known that two fission fragments (FF's) are emitted essentially back to back in the laboratory frame. That can be used widely in many applications as a unique signature of fissionable materials. However, such fission fragments are difficult to detect. The energy and angular distributions of neutrons, on the other hand, are easy to measure, and that distribution will carry information about the fission fragment's energy and angular spectra, as well as the neutron spectra in the fission fragment rest frame. We propose to investigate the two neutron correlation yield resulting from two"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.05413","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":""},"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":"2026-05-17T23:40:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"e9KuzueF43+SrNs7Uuw4RuevvItAEQGHDts/xlKI4YvJ+ueFRwmZYRRoVrAurgTawa/0uDH6VSC3Lin8PWJXAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T13:21:36.589412Z"},"content_sha256":"c995683911881461722d4f6c865d1b42d43b7fa66bdce460427adad2f88dd43b","schema_version":"1.0","event_id":"sha256:c995683911881461722d4f6c865d1b42d43b7fa66bdce460427adad2f88dd43b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MM35SJQZMU2DA65QXAYCEQRSNC/bundle.json","state_url":"https://pith.science/pith/MM35SJQZMU2DA65QXAYCEQRSNC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MM35SJQZMU2DA65QXAYCEQRSNC/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":"2026-06-28T13:21:36Z","links":{"resolver":"https://pith.science/pith/MM35SJQZMU2DA65QXAYCEQRSNC","bundle":"https://pith.science/pith/MM35SJQZMU2DA65QXAYCEQRSNC/bundle.json","state":"https://pith.science/pith/MM35SJQZMU2DA65QXAYCEQRSNC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MM35SJQZMU2DA65QXAYCEQRSNC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:MM35SJQZMU2DA65QXAYCEQRSNC","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":"10c6c089344cd7d5ec22d066c76051c30f3d3059b62d473ffc5a683ba74eccbc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2019-07-11T17:56:46Z","title_canon_sha256":"ef1b4d791fc94257466f330132bfae0414781e0d5305f479d016e1786f1f2e74"},"schema_version":"1.0","source":{"id":"1907.05413","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.05413","created_at":"2026-05-17T23:40:50Z"},{"alias_kind":"arxiv_version","alias_value":"1907.05413v1","created_at":"2026-05-17T23:40:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.05413","created_at":"2026-05-17T23:40:50Z"},{"alias_kind":"pith_short_12","alias_value":"MM35SJQZMU2D","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_16","alias_value":"MM35SJQZMU2DA65Q","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_8","alias_value":"MM35SJQZ","created_at":"2026-05-18T12:33:21Z"}],"graph_snapshots":[{"event_id":"sha256:c995683911881461722d4f6c865d1b42d43b7fa66bdce460427adad2f88dd43b","target":"graph","created_at":"2026-05-17T23:40:50Z","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"},"paper":{"abstract_excerpt":"It is well known that two fission fragments (FF's) are emitted essentially back to back in the laboratory frame. That can be used widely in many applications as a unique signature of fissionable materials. However, such fission fragments are difficult to detect. The energy and angular distributions of neutrons, on the other hand, are easy to measure, and that distribution will carry information about the fission fragment's energy and angular spectra, as well as the neutron spectra in the fission fragment rest frame. We propose to investigate the two neutron correlation yield resulting from two","authors_text":"Roman V. Shapovalov","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2019-07-11T17:56:46Z","title":"Two Neutron Correlation Study in Photofission of Actinides"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.05413","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:f8b23e9f44336afab24c43389befe0bed86aa9315f17eb2f3aba04fcfd40e375","target":"record","created_at":"2026-05-17T23:40:50Z","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":"10c6c089344cd7d5ec22d066c76051c30f3d3059b62d473ffc5a683ba74eccbc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2019-07-11T17:56:46Z","title_canon_sha256":"ef1b4d791fc94257466f330132bfae0414781e0d5305f479d016e1786f1f2e74"},"schema_version":"1.0","source":{"id":"1907.05413","kind":"arxiv","version":1}},"canonical_sha256":"6337d926196534307bb0b83022423268b565daf858163869800381f910d55a72","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6337d926196534307bb0b83022423268b565daf858163869800381f910d55a72","first_computed_at":"2026-05-17T23:40:50.302646Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:40:50.302646Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"OG+8NEZjzdqOp3tYx3TE/v48TmefCs0SOtsx9SJtMx8ug3t2gyc10NiqMOKAy7KappT9TGxoqm9xuNmbL6b6Dw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:40:50.303290Z","signed_message":"canonical_sha256_bytes"},"source_id":"1907.05413","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f8b23e9f44336afab24c43389befe0bed86aa9315f17eb2f3aba04fcfd40e375","sha256:c995683911881461722d4f6c865d1b42d43b7fa66bdce460427adad2f88dd43b"],"state_sha256":"6b557bbe52dffe7b547575088fe36747f799430c2e2a83aa07396a15a51cffaa"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"d+uOME8D7NhnO1UbC1b4C0prFV2jo3yqoZAuelrDl8/g5Wpmpz32CBV7ERdKUgMjUeNkTb6fPOEfXTrCtx0CCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-28T13:21:36.591187Z","bundle_sha256":"de4c8d62f9b49447802f31a3c33ac41b75dca8c994c3eed2813497bbdc2f8dc4"}}