{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:R723XV7YVP4QQK4NSBUNUITVZK","short_pith_number":"pith:R723XV7Y","canonical_record":{"source":{"id":"0907.1758","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2009-07-10T08:45:40Z","cross_cats_sorted":[],"title_canon_sha256":"d0576e6cf6d3eaa07610b95144aa49d0db6bbdf9de0296a0078e0c037c04844a","abstract_canon_sha256":"803637c39e5f0bf6ca954b4eaebd95545f3527764e8dfe317d0f2793fc3a6b35"},"schema_version":"1.0"},"canonical_sha256":"8ff5bbd7f8abf9082b8d9068da2275caa88267c9e8d56cb347ced56274217bf1","source":{"kind":"arxiv","id":"0907.1758","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0907.1758","created_at":"2026-05-18T02:13:04Z"},{"alias_kind":"arxiv_version","alias_value":"0907.1758v1","created_at":"2026-05-18T02:13:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0907.1758","created_at":"2026-05-18T02:13:04Z"},{"alias_kind":"pith_short_12","alias_value":"R723XV7YVP4Q","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_16","alias_value":"R723XV7YVP4QQK4N","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_8","alias_value":"R723XV7Y","created_at":"2026-05-18T12:26:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:R723XV7YVP4QQK4NSBUNUITVZK","target":"record","payload":{"canonical_record":{"source":{"id":"0907.1758","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2009-07-10T08:45:40Z","cross_cats_sorted":[],"title_canon_sha256":"d0576e6cf6d3eaa07610b95144aa49d0db6bbdf9de0296a0078e0c037c04844a","abstract_canon_sha256":"803637c39e5f0bf6ca954b4eaebd95545f3527764e8dfe317d0f2793fc3a6b35"},"schema_version":"1.0"},"canonical_sha256":"8ff5bbd7f8abf9082b8d9068da2275caa88267c9e8d56cb347ced56274217bf1","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:13:04.038907Z","signature_b64":"kQ5S0jV0QhDUuvKpau8EkY44DGg1EcfdaJR9TSK+YZISu3NHW0u8dIvv2XVT8cfTeCg7JqfgyuSL5i7j4nrwAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8ff5bbd7f8abf9082b8d9068da2275caa88267c9e8d56cb347ced56274217bf1","last_reissued_at":"2026-05-18T02:13:04.038361Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:13:04.038361Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0907.1758","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":"2026-05-18T02:13:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nqD+65/ersFT/qBMVRJC8YhsSQOcZuSRj06ONJ7xN58od0n/K8MlDLHqH539y2KKkCwCCHAFqgAUlJ0VIodIDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T13:29:38.530911Z"},"content_sha256":"2520b6127ff67931aa2360d61807c3df943a98265b03a3282b3d643a1ef7e4c4","schema_version":"1.0","event_id":"sha256:2520b6127ff67931aa2360d61807c3df943a98265b03a3282b3d643a1ef7e4c4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:R723XV7YVP4QQK4NSBUNUITVZK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Knockout of proton-neutron pairs from $^{16}$O with electromagnetic probes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"C. Barbieri, C. Giusti, D.G. Middleton, D. Watts, F.D. Pacati, F. Moschini, I.J.D. MacGregor, I. Martin, J.C. McGeorge, J.R.M. Annand, M. Schwamb, P. Grabmayr, T. Hehl","submitted_at":"2009-07-10T08:45:40Z","abstract_excerpt":"After recent improvements to the Pavia model of two-nucleon knockout from $^{16}$O with electromagnetic probes the calculated cross sections are compared to experimental data from such reactions. Comparison with data from a measurement of the $^{16}$O(e,e$'$pn) reaction show much better agreement between experiment and theory than was previously observed. In a comparison with recent data from a measurement of the $^{16}$O($\\gamma$,pn) reaction the model over-predicts the measured cross section at low missing momentum."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0907.1758","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":"2026-05-18T02:13:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Lcm3b8Y3DxhcCx/ncTJT1hxyni14ged5l/zCMGyXDSl2SpOSzDPVogB8UY61OH0QXub23xqUU60DToWFtXUjDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T13:29:38.531619Z"},"content_sha256":"5a0b7faec9608205489f2c36b8816b2f8451b63f6e206ded7a5b566aff51c59e","schema_version":"1.0","event_id":"sha256:5a0b7faec9608205489f2c36b8816b2f8451b63f6e206ded7a5b566aff51c59e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/R723XV7YVP4QQK4NSBUNUITVZK/bundle.json","state_url":"https://pith.science/pith/R723XV7YVP4QQK4NSBUNUITVZK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/R723XV7YVP4QQK4NSBUNUITVZK/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":"2026-05-30T13:29:38Z","links":{"resolver":"https://pith.science/pith/R723XV7YVP4QQK4NSBUNUITVZK","bundle":"https://pith.science/pith/R723XV7YVP4QQK4NSBUNUITVZK/bundle.json","state":"https://pith.science/pith/R723XV7YVP4QQK4NSBUNUITVZK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/R723XV7YVP4QQK4NSBUNUITVZK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:R723XV7YVP4QQK4NSBUNUITVZK","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":"803637c39e5f0bf6ca954b4eaebd95545f3527764e8dfe317d0f2793fc3a6b35","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2009-07-10T08:45:40Z","title_canon_sha256":"d0576e6cf6d3eaa07610b95144aa49d0db6bbdf9de0296a0078e0c037c04844a"},"schema_version":"1.0","source":{"id":"0907.1758","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0907.1758","created_at":"2026-05-18T02:13:04Z"},{"alias_kind":"arxiv_version","alias_value":"0907.1758v1","created_at":"2026-05-18T02:13:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0907.1758","created_at":"2026-05-18T02:13:04Z"},{"alias_kind":"pith_short_12","alias_value":"R723XV7YVP4Q","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_16","alias_value":"R723XV7YVP4QQK4N","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_8","alias_value":"R723XV7Y","created_at":"2026-05-18T12:26:01Z"}],"graph_snapshots":[{"event_id":"sha256:5a0b7faec9608205489f2c36b8816b2f8451b63f6e206ded7a5b566aff51c59e","target":"graph","created_at":"2026-05-18T02:13:04Z","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":"After recent improvements to the Pavia model of two-nucleon knockout from $^{16}$O with electromagnetic probes the calculated cross sections are compared to experimental data from such reactions. Comparison with data from a measurement of the $^{16}$O(e,e$'$pn) reaction show much better agreement between experiment and theory than was previously observed. In a comparison with recent data from a measurement of the $^{16}$O($\\gamma$,pn) reaction the model over-predicts the measured cross section at low missing momentum.","authors_text":"C. Barbieri, C. Giusti, D.G. Middleton, D. Watts, F.D. Pacati, F. Moschini, I.J.D. MacGregor, I. Martin, J.C. McGeorge, J.R.M. Annand, M. Schwamb, P. Grabmayr, T. Hehl","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2009-07-10T08:45:40Z","title":"Knockout of proton-neutron pairs from $^{16}$O with electromagnetic probes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0907.1758","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":"sha256:2520b6127ff67931aa2360d61807c3df943a98265b03a3282b3d643a1ef7e4c4","target":"record","created_at":"2026-05-18T02:13:04Z","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":"803637c39e5f0bf6ca954b4eaebd95545f3527764e8dfe317d0f2793fc3a6b35","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2009-07-10T08:45:40Z","title_canon_sha256":"d0576e6cf6d3eaa07610b95144aa49d0db6bbdf9de0296a0078e0c037c04844a"},"schema_version":"1.0","source":{"id":"0907.1758","kind":"arxiv","version":1}},"canonical_sha256":"8ff5bbd7f8abf9082b8d9068da2275caa88267c9e8d56cb347ced56274217bf1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8ff5bbd7f8abf9082b8d9068da2275caa88267c9e8d56cb347ced56274217bf1","first_computed_at":"2026-05-18T02:13:04.038361Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:13:04.038361Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"kQ5S0jV0QhDUuvKpau8EkY44DGg1EcfdaJR9TSK+YZISu3NHW0u8dIvv2XVT8cfTeCg7JqfgyuSL5i7j4nrwAA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:13:04.038907Z","signed_message":"canonical_sha256_bytes"},"source_id":"0907.1758","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2520b6127ff67931aa2360d61807c3df943a98265b03a3282b3d643a1ef7e4c4","sha256:5a0b7faec9608205489f2c36b8816b2f8451b63f6e206ded7a5b566aff51c59e"],"state_sha256":"07a3a2624096b75557c674908e27bad95fd9dcf503d4eb45b90a6645287ca325"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5SeX+O/EYOQmlzSuRrqZdNN1aKLxhQwJnHYvksCEaN8D7+5mXt5PbuU+keEr0KzYfXUqYUVjc1/7S9QaC67GAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T13:29:38.535482Z","bundle_sha256":"9556ab380ec6578ef5530b2e4415cc6bc9454c6ecdd5fd8b5b23641979d1480b"}}