{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2002:DATQ3UAUF3XBAIFV23EQ3PHE65","short_pith_number":"pith:DATQ3UAU","schema_version":"1.0","canonical_sha256":"18270dd0142eee1020b5d6c90dbce4f744e5b88f3570ab0e80a52b4515f3efad","source":{"kind":"arxiv","id":"nucl-ex/0207008","version":2},"attestation_state":"computed","paper":{"title":"Universal Pion Freeze-out in Heavy-Ion Collisions","license":"","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"CERES Collaboration","submitted_at":"2002-07-16T16:09:33Z","abstract_excerpt":"Based on an evaluation of data on pion interferometry and on particle yields at mid-rapidity, we propose a universal condition for thermal freeze-out of pions in heavy-ion collisions. We show that freeze-out occurs when the mean free path of pions lambda_f reaches a value of about 1 fm, which is much smaller than the spatial extent of the system at freeze-out. This critical mean free path is independent of the centrality of the collision and beam energy from AGS to RHIC."},"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":"nucl-ex/0207008","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"nucl-ex","submitted_at":"2002-07-16T16:09:33Z","cross_cats_sorted":[],"title_canon_sha256":"e70ca080a41887924dc8569a2e72e48cc661da6b5fd2271e4186b6edab62194a","abstract_canon_sha256":"d8306f89dbdec21944a87b7daab929783793112745a643b97182eaf42f9d6424"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:47:10.336956Z","signature_b64":"7SN85opq/8kfVrD/Oywt26WUKrZueTlbGl2u1KchR8+19SBb5X2lYiCQXvIt2251/jxcpij8QpS0vohpysnXAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"18270dd0142eee1020b5d6c90dbce4f744e5b88f3570ab0e80a52b4515f3efad","last_reissued_at":"2026-05-18T03:47:10.336579Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:47:10.336579Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Universal Pion Freeze-out in Heavy-Ion Collisions","license":"","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"CERES Collaboration","submitted_at":"2002-07-16T16:09:33Z","abstract_excerpt":"Based on an evaluation of data on pion interferometry and on particle yields at mid-rapidity, we propose a universal condition for thermal freeze-out of pions in heavy-ion collisions. We show that freeze-out occurs when the mean free path of pions lambda_f reaches a value of about 1 fm, which is much smaller than the spatial extent of the system at freeze-out. This critical mean free path is independent of the centrality of the collision and beam energy from AGS to RHIC."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"nucl-ex/0207008","kind":"arxiv","version":2},"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":"nucl-ex/0207008","created_at":"2026-05-18T03:47:10.336636+00:00"},{"alias_kind":"arxiv_version","alias_value":"nucl-ex/0207008v2","created_at":"2026-05-18T03:47:10.336636+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.nucl-ex/0207008","created_at":"2026-05-18T03:47:10.336636+00:00"},{"alias_kind":"pith_short_12","alias_value":"DATQ3UAUF3XB","created_at":"2026-05-18T12:25:50.845339+00:00"},{"alias_kind":"pith_short_16","alias_value":"DATQ3UAUF3XBAIFV","created_at":"2026-05-18T12:25:50.845339+00:00"},{"alias_kind":"pith_short_8","alias_value":"DATQ3UAU","created_at":"2026-05-18T12:25:50.845339+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/DATQ3UAUF3XBAIFV23EQ3PHE65","json":"https://pith.science/pith/DATQ3UAUF3XBAIFV23EQ3PHE65.json","graph_json":"https://pith.science/api/pith-number/DATQ3UAUF3XBAIFV23EQ3PHE65/graph.json","events_json":"https://pith.science/api/pith-number/DATQ3UAUF3XBAIFV23EQ3PHE65/events.json","paper":"https://pith.science/paper/DATQ3UAU"},"agent_actions":{"view_html":"https://pith.science/pith/DATQ3UAUF3XBAIFV23EQ3PHE65","download_json":"https://pith.science/pith/DATQ3UAUF3XBAIFV23EQ3PHE65.json","view_paper":"https://pith.science/paper/DATQ3UAU","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=nucl-ex/0207008&json=true","fetch_graph":"https://pith.science/api/pith-number/DATQ3UAUF3XBAIFV23EQ3PHE65/graph.json","fetch_events":"https://pith.science/api/pith-number/DATQ3UAUF3XBAIFV23EQ3PHE65/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/DATQ3UAUF3XBAIFV23EQ3PHE65/action/timestamp_anchor","attest_storage":"https://pith.science/pith/DATQ3UAUF3XBAIFV23EQ3PHE65/action/storage_attestation","attest_author":"https://pith.science/pith/DATQ3UAUF3XBAIFV23EQ3PHE65/action/author_attestation","sign_citation":"https://pith.science/pith/DATQ3UAUF3XBAIFV23EQ3PHE65/action/citation_signature","submit_replication":"https://pith.science/pith/DATQ3UAUF3XBAIFV23EQ3PHE65/action/replication_record"}},"created_at":"2026-05-18T03:47:10.336636+00:00","updated_at":"2026-05-18T03:47:10.336636+00:00"}