{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2005:UWSEEIYP7QNBEHJIAHPFJ5RTHW","short_pith_number":"pith:UWSEEIYP","schema_version":"1.0","canonical_sha256":"a5a442230ffc1a121d2801de54f6333da2edc21485b192002a5675012e984be7","source":{"kind":"arxiv","id":"astro-ph/0507656","version":1},"attestation_state":"computed","paper":{"title":"Magnetized Sources of Ultra-high Energy Nuclei and Extragalactic Origin of the Ankle","license":"","headline":"","cross_cats":["hep-ph"],"primary_cat":"astro-ph","authors_text":"Eric Armengaud (APC, GReCO, Guenter Sigl, Paris)","submitted_at":"2005-07-28T16:56:24Z","abstract_excerpt":"It has recently been suggested that ultra-high energy cosmic rays could have an extragalactic origin down to the \"second knee\" at ~4x10^{17}eV. In this case the \"ankle\" or \"dip\" at ~5x10^{18}eV would be due to pair production of extragalactic protons on the cosmic microwave background which requires an injection spectrum of about E^{-2.6}. It has been pointed out that for injection of a mixed composition of nuclei a harder injection spectrum \\~E^{-2.2} is required to fit the spectra at the highest energies and a galactic component is required in this case to fit the spectrum below the ankle, u"},"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":"astro-ph/0507656","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2005-07-28T16:56:24Z","cross_cats_sorted":["hep-ph"],"title_canon_sha256":"d5ca12ce1a4e6d204d98993c07da00d9c6c97ef00919ee651d63cd50f6b2a27d","abstract_canon_sha256":"4f3c849e5076469655294d4745c570e3370f28f2fead23385811b7cd0d3eb00e"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:07:30.939801Z","signature_b64":"aFZKI1QUO1gBAPFc7lAbs/m8HXCzLA9kvsMFVB9VQ2DLNJnvGL0/EpLgJ4rO9CCkPSAU4k1gxs2pQUQOXGClCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a5a442230ffc1a121d2801de54f6333da2edc21485b192002a5675012e984be7","last_reissued_at":"2026-05-18T01:07:30.939197Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:07:30.939197Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Magnetized Sources of Ultra-high Energy Nuclei and Extragalactic Origin of the Ankle","license":"","headline":"","cross_cats":["hep-ph"],"primary_cat":"astro-ph","authors_text":"Eric Armengaud (APC, GReCO, Guenter Sigl, Paris)","submitted_at":"2005-07-28T16:56:24Z","abstract_excerpt":"It has recently been suggested that ultra-high energy cosmic rays could have an extragalactic origin down to the \"second knee\" at ~4x10^{17}eV. In this case the \"ankle\" or \"dip\" at ~5x10^{18}eV would be due to pair production of extragalactic protons on the cosmic microwave background which requires an injection spectrum of about E^{-2.6}. It has been pointed out that for injection of a mixed composition of nuclei a harder injection spectrum \\~E^{-2.2} is required to fit the spectra at the highest energies and a galactic component is required in this case to fit the spectrum below the ankle, u"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0507656","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":"astro-ph/0507656","created_at":"2026-05-18T01:07:30.939279+00:00"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0507656v1","created_at":"2026-05-18T01:07:30.939279+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0507656","created_at":"2026-05-18T01:07:30.939279+00:00"},{"alias_kind":"pith_short_12","alias_value":"UWSEEIYP7QNB","created_at":"2026-05-18T12:25:53.939244+00:00"},{"alias_kind":"pith_short_16","alias_value":"UWSEEIYP7QNBEHJI","created_at":"2026-05-18T12:25:53.939244+00:00"},{"alias_kind":"pith_short_8","alias_value":"UWSEEIYP","created_at":"2026-05-18T12:25:53.939244+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/UWSEEIYP7QNBEHJIAHPFJ5RTHW","json":"https://pith.science/pith/UWSEEIYP7QNBEHJIAHPFJ5RTHW.json","graph_json":"https://pith.science/api/pith-number/UWSEEIYP7QNBEHJIAHPFJ5RTHW/graph.json","events_json":"https://pith.science/api/pith-number/UWSEEIYP7QNBEHJIAHPFJ5RTHW/events.json","paper":"https://pith.science/paper/UWSEEIYP"},"agent_actions":{"view_html":"https://pith.science/pith/UWSEEIYP7QNBEHJIAHPFJ5RTHW","download_json":"https://pith.science/pith/UWSEEIYP7QNBEHJIAHPFJ5RTHW.json","view_paper":"https://pith.science/paper/UWSEEIYP","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=astro-ph/0507656&json=true","fetch_graph":"https://pith.science/api/pith-number/UWSEEIYP7QNBEHJIAHPFJ5RTHW/graph.json","fetch_events":"https://pith.science/api/pith-number/UWSEEIYP7QNBEHJIAHPFJ5RTHW/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/UWSEEIYP7QNBEHJIAHPFJ5RTHW/action/timestamp_anchor","attest_storage":"https://pith.science/pith/UWSEEIYP7QNBEHJIAHPFJ5RTHW/action/storage_attestation","attest_author":"https://pith.science/pith/UWSEEIYP7QNBEHJIAHPFJ5RTHW/action/author_attestation","sign_citation":"https://pith.science/pith/UWSEEIYP7QNBEHJIAHPFJ5RTHW/action/citation_signature","submit_replication":"https://pith.science/pith/UWSEEIYP7QNBEHJIAHPFJ5RTHW/action/replication_record"}},"created_at":"2026-05-18T01:07:30.939279+00:00","updated_at":"2026-05-18T01:07:30.939279+00:00"}