{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:YJDWI2FPL3WFAO3TRUXVEG4HIQ","short_pith_number":"pith:YJDWI2FP","canonical_record":{"source":{"id":"1903.11879","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2019-03-28T10:18:15Z","cross_cats_sorted":[],"title_canon_sha256":"101cf6e4feb5cebe80bb59be2310d1526467449bf6ebcb6633e0e5d2cdfe4e5a","abstract_canon_sha256":"9817a0ba0bf7a3c7170e6dc5b88cf5bd6c628a0d65d3505d1e48397482b25619"},"schema_version":"1.0"},"canonical_sha256":"c2476468af5eec503b738d2f521b87440052e7f56319f39415bc786f43884f42","source":{"kind":"arxiv","id":"1903.11879","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1903.11879","created_at":"2026-05-17T23:49:58Z"},{"alias_kind":"arxiv_version","alias_value":"1903.11879v1","created_at":"2026-05-17T23:49:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1903.11879","created_at":"2026-05-17T23:49:58Z"},{"alias_kind":"pith_short_12","alias_value":"YJDWI2FPL3WF","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_16","alias_value":"YJDWI2FPL3WFAO3T","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_8","alias_value":"YJDWI2FP","created_at":"2026-05-18T12:33:33Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:YJDWI2FPL3WFAO3TRUXVEG4HIQ","target":"record","payload":{"canonical_record":{"source":{"id":"1903.11879","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2019-03-28T10:18:15Z","cross_cats_sorted":[],"title_canon_sha256":"101cf6e4feb5cebe80bb59be2310d1526467449bf6ebcb6633e0e5d2cdfe4e5a","abstract_canon_sha256":"9817a0ba0bf7a3c7170e6dc5b88cf5bd6c628a0d65d3505d1e48397482b25619"},"schema_version":"1.0"},"canonical_sha256":"c2476468af5eec503b738d2f521b87440052e7f56319f39415bc786f43884f42","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:49:58.810025Z","signature_b64":"NXPUqJ3jv652a+dz2oBfF3fRpUHKSoSbfnppYxfhtR8zbxP2UycOGJKPfp3O7pn55e2gp75WUrmW8aii1ot9Bw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c2476468af5eec503b738d2f521b87440052e7f56319f39415bc786f43884f42","last_reissued_at":"2026-05-17T23:49:58.809391Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:49:58.809391Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1903.11879","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":"2026-05-17T23:49:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5u79UPemRIPu0Q5rCnxofJ6h9KX+gvqTr6a/+6nX577O+4aqqOV481XYQDOIJTghRlK23oj60/WnsODRBH7WBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T15:10:51.433294Z"},"content_sha256":"db15b39b0ce3e47f4ce4aca214ffc4d30ef5721f82e65bdb54deb207b2ad36c8","schema_version":"1.0","event_id":"sha256:db15b39b0ce3e47f4ce4aca214ffc4d30ef5721f82e65bdb54deb207b2ad36c8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:YJDWI2FPL3WFAO3TRUXVEG4HIQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"ANNIE Phase I: Neutron Background Measurements","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"B. Richards, E. Drakopoulou","submitted_at":"2019-03-28T10:18:15Z","abstract_excerpt":"The Accelerator Neutrino Neutron Interaction Experiment (ANNIE) is a 26-ton Gd-doped water Cherenkov detector installed in the Booster Neutrino Beam (BNB) at Fermilab. The primary physics goal of ANNIE is to study the multiplicity of final state neutrons from neutrino-nucleus interactions in water. Identifying and counting final state neutrons provides a new experimental handle to study systematic uncertainties related to the neutrino energy reconstruction in oscillation experiments. To achieve that goal ANNIE will make the first use of the novel Large Area Picosecond PhotoDetectors (LAPPDs). "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1903.11879","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":"2026-05-17T23:49:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"n2v/D6XSolK3WJ6DuqAMbnUv1gDUUviGkqKNZ4nAg7a/hrgaNKBlYVKQbwlSBHdwXlXZJo6GRLsjaVZWoscIBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T15:10:51.433686Z"},"content_sha256":"1db5d2621d7e5208056de665f137e458bfc7db5983fa7142477412b44b345351","schema_version":"1.0","event_id":"sha256:1db5d2621d7e5208056de665f137e458bfc7db5983fa7142477412b44b345351"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YJDWI2FPL3WFAO3TRUXVEG4HIQ/bundle.json","state_url":"https://pith.science/pith/YJDWI2FPL3WFAO3TRUXVEG4HIQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YJDWI2FPL3WFAO3TRUXVEG4HIQ/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":"2026-06-03T15:10:51Z","links":{"resolver":"https://pith.science/pith/YJDWI2FPL3WFAO3TRUXVEG4HIQ","bundle":"https://pith.science/pith/YJDWI2FPL3WFAO3TRUXVEG4HIQ/bundle.json","state":"https://pith.science/pith/YJDWI2FPL3WFAO3TRUXVEG4HIQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YJDWI2FPL3WFAO3TRUXVEG4HIQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:YJDWI2FPL3WFAO3TRUXVEG4HIQ","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":"9817a0ba0bf7a3c7170e6dc5b88cf5bd6c628a0d65d3505d1e48397482b25619","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2019-03-28T10:18:15Z","title_canon_sha256":"101cf6e4feb5cebe80bb59be2310d1526467449bf6ebcb6633e0e5d2cdfe4e5a"},"schema_version":"1.0","source":{"id":"1903.11879","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1903.11879","created_at":"2026-05-17T23:49:58Z"},{"alias_kind":"arxiv_version","alias_value":"1903.11879v1","created_at":"2026-05-17T23:49:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1903.11879","created_at":"2026-05-17T23:49:58Z"},{"alias_kind":"pith_short_12","alias_value":"YJDWI2FPL3WF","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_16","alias_value":"YJDWI2FPL3WFAO3T","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_8","alias_value":"YJDWI2FP","created_at":"2026-05-18T12:33:33Z"}],"graph_snapshots":[{"event_id":"sha256:1db5d2621d7e5208056de665f137e458bfc7db5983fa7142477412b44b345351","target":"graph","created_at":"2026-05-17T23:49:58Z","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":"The Accelerator Neutrino Neutron Interaction Experiment (ANNIE) is a 26-ton Gd-doped water Cherenkov detector installed in the Booster Neutrino Beam (BNB) at Fermilab. The primary physics goal of ANNIE is to study the multiplicity of final state neutrons from neutrino-nucleus interactions in water. Identifying and counting final state neutrons provides a new experimental handle to study systematic uncertainties related to the neutrino energy reconstruction in oscillation experiments. To achieve that goal ANNIE will make the first use of the novel Large Area Picosecond PhotoDetectors (LAPPDs). ","authors_text":"B. Richards, E. Drakopoulou","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2019-03-28T10:18:15Z","title":"ANNIE Phase I: Neutron Background Measurements"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1903.11879","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:db15b39b0ce3e47f4ce4aca214ffc4d30ef5721f82e65bdb54deb207b2ad36c8","target":"record","created_at":"2026-05-17T23:49:58Z","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":"9817a0ba0bf7a3c7170e6dc5b88cf5bd6c628a0d65d3505d1e48397482b25619","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2019-03-28T10:18:15Z","title_canon_sha256":"101cf6e4feb5cebe80bb59be2310d1526467449bf6ebcb6633e0e5d2cdfe4e5a"},"schema_version":"1.0","source":{"id":"1903.11879","kind":"arxiv","version":1}},"canonical_sha256":"c2476468af5eec503b738d2f521b87440052e7f56319f39415bc786f43884f42","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c2476468af5eec503b738d2f521b87440052e7f56319f39415bc786f43884f42","first_computed_at":"2026-05-17T23:49:58.809391Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:49:58.809391Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"NXPUqJ3jv652a+dz2oBfF3fRpUHKSoSbfnppYxfhtR8zbxP2UycOGJKPfp3O7pn55e2gp75WUrmW8aii1ot9Bw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:49:58.810025Z","signed_message":"canonical_sha256_bytes"},"source_id":"1903.11879","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:db15b39b0ce3e47f4ce4aca214ffc4d30ef5721f82e65bdb54deb207b2ad36c8","sha256:1db5d2621d7e5208056de665f137e458bfc7db5983fa7142477412b44b345351"],"state_sha256":"38e585d6bb1fdec3032b0c671de4466ed9c009270f08c736db933cd5ad80866f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6yCAOfpt2GdD8yZzYu9WQkceBPKZlfgzGasOSl4r86uDsUGI6LBlgdKE+e5to2rfNERk3IaoZ7SX4YD7Omm+CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T15:10:51.436504Z","bundle_sha256":"aab2470afcc3e77e70191e60f3cae9282ff863e890621b91fa500b3261bc68ad"}}