{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:4HEPO4KH7OCL5LFPIUAUVEOGUE","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":"62bd4dcf4e5ec199ad6864b4bfd3ce04742df746342d9e2b1819109881f6c5b9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-10-21T21:42:14Z","title_canon_sha256":"d3828c327c63586deda75730af6be02d97b7c58434de1cc0f580bd70df2b482d"},"schema_version":"1.0","source":{"id":"0910.4184","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0910.4184","created_at":"2026-07-04T17:27:28Z"},{"alias_kind":"arxiv_version","alias_value":"0910.4184v2","created_at":"2026-07-04T17:27:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0910.4184","created_at":"2026-07-04T17:27:28Z"},{"alias_kind":"pith_short_12","alias_value":"4HEPO4KH7OCL","created_at":"2026-07-04T17:27:28Z"},{"alias_kind":"pith_short_16","alias_value":"4HEPO4KH7OCL5LFP","created_at":"2026-07-04T17:27:28Z"},{"alias_kind":"pith_short_8","alias_value":"4HEPO4KH","created_at":"2026-07-04T17:27:28Z"}],"graph_snapshots":[{"event_id":"sha256:b28dda62b23649da0acc00814c58af5fcc7eba2f1b58c53d402ad48289ce6954","target":"graph","created_at":"2026-07-04T17:27:28Z","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/0910.4184/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We report studies of ultra-high energy cosmic ray composition via analysis of depth of airshower maximum (Xmax), for airshower events collected by the High Resolution Fly's Eye (HiRes) observatory. The HiRes data are consistent with a constant elongation rate d<Xmax>/d(log(E)) of 47.9 +- 6.0 (stat.) +- 3.2 (syst.)g/cm^2/decade for energies between 1.6 EeV and 63 EeV, and are consistent with a predominantly protonic composition of cosmic rays when interpreted via the QGSJET01 and QGSJET-II high-energy hadronic interaction models. These measurements constrain models in which the galactic-to-extr","authors_text":"A. O'Neill, A. Zech, B.F Jones, B.T. Stokes, C.A. Painter, C.B. Finley, C. Cannon, C.C.H. Jui, C.M. Hoffman, C. Song, D.R. Bergman, D. Rodriguez, D. Tupa, E.C. Loh, G. Archbold, G.B. Thomson, G. Hughes, G. Sinnis, G.W. Burt, J.A.J. Matthews, J.D. Smith, J.F. Amman, J.N. Matthews, J.P. Lundquist, J.R. Thomas, J.W. Belz, K. Belov, K. Kim, K. Martens, K. Reil, L.J. Marek, L.M. Scott, L. Perera, M.A. Kirn, M. Allen, M. Al-Seady, M.H. Holzscheiter, M.M. Maestas, M. Roberts, N. Manago, N. Sasaki, O.A. Brusova, P. Huentemeyer, P. Sokolsky, R.C. Gray, R.J. Anderson, R. Riehle, R.U. Abbasi, R.W. Springer, S.A. Blake, S.A. Moore, S.B. Thomas, S.R. Schnetzer, S. Stratton, T. Abu-Zayyad, W. Deng, W.F. Hanlon, X. Zhang, Y. Fedorova, Z. Cao","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-10-21T21:42:14Z","title":"Indications of Proton-Dominated Cosmic Ray Composition above 1.6 EeV"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0910.4184","kind":"arxiv","version":2},"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:c461b075e7e568e01cbe73ecf20406bef27a00ddabe04fa13dcbcbdf4036f285","target":"record","created_at":"2026-07-04T17:27:28Z","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":"62bd4dcf4e5ec199ad6864b4bfd3ce04742df746342d9e2b1819109881f6c5b9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-10-21T21:42:14Z","title_canon_sha256":"d3828c327c63586deda75730af6be02d97b7c58434de1cc0f580bd70df2b482d"},"schema_version":"1.0","source":{"id":"0910.4184","kind":"arxiv","version":2}},"canonical_sha256":"e1c8f77147fb84beacaf45014a91c6a12b4ca2ae3e6a627921f29931a4cc4ede","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e1c8f77147fb84beacaf45014a91c6a12b4ca2ae3e6a627921f29931a4cc4ede","first_computed_at":"2026-07-04T17:27:28.489711Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T17:27:28.489711Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0iwzwW3IJbxV3A9p/tV+yWeNpaIp7bzUJ0lzji7UBdMm4GqEspU8GEKUhMCW/CAxjVQHQt3ePxzx1lGduu0DBw==","signature_status":"signed_v1","signed_at":"2026-07-04T17:27:28.490168Z","signed_message":"canonical_sha256_bytes"},"source_id":"0910.4184","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c461b075e7e568e01cbe73ecf20406bef27a00ddabe04fa13dcbcbdf4036f285","sha256:b28dda62b23649da0acc00814c58af5fcc7eba2f1b58c53d402ad48289ce6954"],"state_sha256":"637a1f080fa3cffcb2303b3d9076828adb95099a0814142c9f96f268a0adf46e"}