{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2015:2LZZ6MHDX2OOFEMQGACNSJFYR2","short_pith_number":"pith:2LZZ6MHD","schema_version":"1.0","canonical_sha256":"d2f39f30e3be9ce291903004d924b88e9105e7ad68b6e9ba8faa81a502f21b61","source":{"kind":"arxiv","id":"1512.00484","version":1},"attestation_state":"computed","paper":{"title":"Origin of the ankle in the ultra-high energy cosmic ray spectrum and of the extragalactic protons below it","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Glennys R. Farrar, Luis A. Anchordoqui, Michael Unger","submitted_at":"2015-12-01T21:17:30Z","abstract_excerpt":"The sharp change in slope of the ultra-high energy cosmic ray (UHECR) spectrum around 10^{18.6} eV (the ankle), combined with evidence of a light but extragalactic component near and below the ankle which evolves to intermediate composition above, has proved exceedingly challenging to understand theoretically. We show that for a range of source conditions, photo-disintegration of ultra-high energy nuclei in the region surrounding a UHECR accelerator naturally accounts for the observed spectrum and composition of the entire extragalactic component, which dominates above about 10^{17.5} eV. The "},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1512.00484","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-12-01T21:17:30Z","cross_cats_sorted":[],"title_canon_sha256":"fb85ee2187df998ffc04c9f0d6192d27f72ab1c06412433790b96ed2f1f6d703","abstract_canon_sha256":"6130c62079b85b50416d9130eae0255776f6297425ff8b8cb1df387aeb4a96aa"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:25:25.805693Z","signature_b64":"ZZcxGYPmoSNhoNJziKNkQyGUq1I2cKoYkKKWUWRflnpeu9qvWEtqSuCOxa4IZN3S0K1vrvqRYn8vdbY58GfPCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d2f39f30e3be9ce291903004d924b88e9105e7ad68b6e9ba8faa81a502f21b61","last_reissued_at":"2026-05-18T01:25:25.805153Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:25:25.805153Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Origin of the ankle in the ultra-high energy cosmic ray spectrum and of the extragalactic protons below it","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Glennys R. Farrar, Luis A. Anchordoqui, Michael Unger","submitted_at":"2015-12-01T21:17:30Z","abstract_excerpt":"The sharp change in slope of the ultra-high energy cosmic ray (UHECR) spectrum around 10^{18.6} eV (the ankle), combined with evidence of a light but extragalactic component near and below the ankle which evolves to intermediate composition above, has proved exceedingly challenging to understand theoretically. We show that for a range of source conditions, photo-disintegration of ultra-high energy nuclei in the region surrounding a UHECR accelerator naturally accounts for the observed spectrum and composition of the entire extragalactic component, which dominates above about 10^{17.5} eV. The "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1512.00484","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1512.00484","created_at":"2026-05-18T01:25:25.805235+00:00"},{"alias_kind":"arxiv_version","alias_value":"1512.00484v1","created_at":"2026-05-18T01:25:25.805235+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1512.00484","created_at":"2026-05-18T01:25:25.805235+00:00"},{"alias_kind":"pith_short_12","alias_value":"2LZZ6MHDX2OO","created_at":"2026-05-18T12:29:02.477457+00:00"},{"alias_kind":"pith_short_16","alias_value":"2LZZ6MHDX2OOFEMQ","created_at":"2026-05-18T12:29:02.477457+00:00"},{"alias_kind":"pith_short_8","alias_value":"2LZZ6MHD","created_at":"2026-05-18T12:29:02.477457+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/2LZZ6MHDX2OOFEMQGACNSJFYR2","json":"https://pith.science/pith/2LZZ6MHDX2OOFEMQGACNSJFYR2.json","graph_json":"https://pith.science/api/pith-number/2LZZ6MHDX2OOFEMQGACNSJFYR2/graph.json","events_json":"https://pith.science/api/pith-number/2LZZ6MHDX2OOFEMQGACNSJFYR2/events.json","paper":"https://pith.science/paper/2LZZ6MHD"},"agent_actions":{"view_html":"https://pith.science/pith/2LZZ6MHDX2OOFEMQGACNSJFYR2","download_json":"https://pith.science/pith/2LZZ6MHDX2OOFEMQGACNSJFYR2.json","view_paper":"https://pith.science/paper/2LZZ6MHD","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1512.00484&json=true","fetch_graph":"https://pith.science/api/pith-number/2LZZ6MHDX2OOFEMQGACNSJFYR2/graph.json","fetch_events":"https://pith.science/api/pith-number/2LZZ6MHDX2OOFEMQGACNSJFYR2/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/2LZZ6MHDX2OOFEMQGACNSJFYR2/action/timestamp_anchor","attest_storage":"https://pith.science/pith/2LZZ6MHDX2OOFEMQGACNSJFYR2/action/storage_attestation","attest_author":"https://pith.science/pith/2LZZ6MHDX2OOFEMQGACNSJFYR2/action/author_attestation","sign_citation":"https://pith.science/pith/2LZZ6MHDX2OOFEMQGACNSJFYR2/action/citation_signature","submit_replication":"https://pith.science/pith/2LZZ6MHDX2OOFEMQGACNSJFYR2/action/replication_record"}},"created_at":"2026-05-18T01:25:25.805235+00:00","updated_at":"2026-05-18T01:25:25.805235+00:00"}