{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:YNYVZU63EBQ4YSAU4TAILTI7OD","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":"538100b18231a82701144ab1a63a6605dbabd6a70d1aa5a785cbf6fe77e57d1a","cross_cats_sorted":["physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2014-09-05T20:16:31Z","title_canon_sha256":"ac88275e86d814e33556bbaf7509da9240cfd29468c53a10989a7dfdf886d8b8"},"schema_version":"1.0","source":{"id":"1409.1938","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1409.1938","created_at":"2026-05-18T02:43:18Z"},{"alias_kind":"arxiv_version","alias_value":"1409.1938v1","created_at":"2026-05-18T02:43:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1409.1938","created_at":"2026-05-18T02:43:18Z"},{"alias_kind":"pith_short_12","alias_value":"YNYVZU63EBQ4","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_16","alias_value":"YNYVZU63EBQ4YSAU","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_8","alias_value":"YNYVZU63","created_at":"2026-05-18T12:28:57Z"}],"graph_snapshots":[{"event_id":"sha256:fcee2673581f5106977b6a4b788b09debb87883f032158830234c7cef6a0638f","target":"graph","created_at":"2026-05-18T02:43:18Z","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 dose distribution of a monoenergetic pencil beam in water consists of an electromagnetic \"core\", a \"halo\" from charged nuclear secondaries, and a much larger \"aura\" from neutral secondaries. These regions overlap, but each has distinct spatial characteristics.\n  We have measured the core/halo using a 177MeV test beam offset in a water tank. The beam monitor was a fluence calibrated plane parallel ionization chamber (IC) and the field chamber, a dose calibrated Exradin T1, so the dose measurements are absolute (MeV/g/p). We performed depth-dose scans at ten displacements from the beam axis ","authors_text":"Bernard Gottschalk, Ethan W. Cascio, Juliane Daartz, Miles S. Wagner","cross_cats":["physics.ins-det"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2014-09-05T20:16:31Z","title":"Nuclear halo of a 177 MeV proton beam in water: theory, measurement and parameterization"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1409.1938","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:d7382fafeb83842afcc758e60d3fa39c1e3f9e9aa4a0fd30d2ed6f36b7bb2a93","target":"record","created_at":"2026-05-18T02:43:18Z","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":"538100b18231a82701144ab1a63a6605dbabd6a70d1aa5a785cbf6fe77e57d1a","cross_cats_sorted":["physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2014-09-05T20:16:31Z","title_canon_sha256":"ac88275e86d814e33556bbaf7509da9240cfd29468c53a10989a7dfdf886d8b8"},"schema_version":"1.0","source":{"id":"1409.1938","kind":"arxiv","version":1}},"canonical_sha256":"c3715cd3db2061cc4814e4c085cd1f70f2f7191fdfa5eebfb1a109ee945b4dde","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c3715cd3db2061cc4814e4c085cd1f70f2f7191fdfa5eebfb1a109ee945b4dde","first_computed_at":"2026-05-18T02:43:18.414019Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:43:18.414019Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"KAFs4kv56ALYQCvyGBpLZlnLhJ7/+EThfFpnAudEosCFzz2klrO93LVLQpESLATceM7ZC5r9XvU9l4kKR8VHAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:43:18.414728Z","signed_message":"canonical_sha256_bytes"},"source_id":"1409.1938","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d7382fafeb83842afcc758e60d3fa39c1e3f9e9aa4a0fd30d2ed6f36b7bb2a93","sha256:fcee2673581f5106977b6a4b788b09debb87883f032158830234c7cef6a0638f"],"state_sha256":"c515cbcb55d617061d3422dbcaeacd7a718a5dfbaa5d752784aa42a19e13757e"}