{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2004:4HUKOPMXIMJRSPLUXBTWWTQGMP","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":"9a678476cee8435854c98bda39abaa7f5c603b7af1ea5dc93602fd0980ddae18","cross_cats_sorted":[],"license":"","primary_cat":"nucl-ex","submitted_at":"2004-04-26T12:18:50Z","title_canon_sha256":"bc5c1ea668adc686b6c147ca74d6b5180903befed82702b589ebb10616e1f28d"},"schema_version":"1.0","source":{"id":"nucl-ex/0404031","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"nucl-ex/0404031","created_at":"2026-07-04T16:49:30Z"},{"alias_kind":"arxiv_version","alias_value":"nucl-ex/0404031v2","created_at":"2026-07-04T16:49:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.nucl-ex/0404031","created_at":"2026-07-04T16:49:30Z"},{"alias_kind":"pith_short_12","alias_value":"4HUKOPMXIMJR","created_at":"2026-07-04T16:49:30Z"},{"alias_kind":"pith_short_16","alias_value":"4HUKOPMXIMJRSPLU","created_at":"2026-07-04T16:49:30Z"},{"alias_kind":"pith_short_8","alias_value":"4HUKOPMX","created_at":"2026-07-04T16:49:30Z"}],"graph_snapshots":[{"event_id":"sha256:f4e3f541b368b4038d6602ad4120271a1259d4cd4c54e8e6fbd1bb1f76117487","target":"graph","created_at":"2026-07-04T16:49:30Z","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/nucl-ex/0404031/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Differential cross sections for elastic scattering of 21.5 MeV positive and negative pions by Si, Ca, Ni and Zr have been measured as part of a study of the pion-nucleus potential across threshold. The `anomalous' repulsion in the s-wave term was observed, as is the case with pionic atoms. The extra repulsion can be accounted for by a chiral-motivated model where the pion decay constant is modified in the medium. Unlike in pionic atoms, the anomaly cannot be removed by merely introducing an empirical on-shell energy dependence.","authors_text":"(2) U. of Tuebingen, (3) TRIUMF, A. Erhardt (2), E. Doroshkevich (2), E. Friedman (1), G.J. Hofman (3), G.J.Wagner (2), G. Yaari (1) ((1) Hebrew U., H. Clement (2), H. Denz (2), J. Breitschopf (2), M. Bauer (2), R. Meier (2), U. of Regina)","cross_cats":[],"headline":"","license":"","primary_cat":"nucl-ex","submitted_at":"2004-04-26T12:18:50Z","title":"The in-medium isovector pi N amplitude from low energy pion scattering"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"nucl-ex/0404031","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":"sha256:9b289f5769a8dbf4ea24f2e7140ba015e9d21129acc4c9065813ab7000312bfc","target":"record","created_at":"2026-07-04T16:49:30Z","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":"9a678476cee8435854c98bda39abaa7f5c603b7af1ea5dc93602fd0980ddae18","cross_cats_sorted":[],"license":"","primary_cat":"nucl-ex","submitted_at":"2004-04-26T12:18:50Z","title_canon_sha256":"bc5c1ea668adc686b6c147ca74d6b5180903befed82702b589ebb10616e1f28d"},"schema_version":"1.0","source":{"id":"nucl-ex/0404031","kind":"arxiv","version":2}},"canonical_sha256":"e1e8a73d974313193d74b8676b4e0663c6688474dc6e2b4127fdc030afd8f903","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e1e8a73d974313193d74b8676b4e0663c6688474dc6e2b4127fdc030afd8f903","first_computed_at":"2026-07-04T16:49:30.476742Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:49:30.476742Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"OjT42E5DjxsF+9YB4fXByKFraliMp3xIVhyWMkuzNYwMmJzMPMAJmCw6kEHNZMnAE1Ry/d/90i16XRoN7bNLBg==","signature_status":"signed_v1","signed_at":"2026-07-04T16:49:30.477132Z","signed_message":"canonical_sha256_bytes"},"source_id":"nucl-ex/0404031","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9b289f5769a8dbf4ea24f2e7140ba015e9d21129acc4c9065813ab7000312bfc","sha256:f4e3f541b368b4038d6602ad4120271a1259d4cd4c54e8e6fbd1bb1f76117487"],"state_sha256":"e157b51af25f7c89a3650cbe57091b215a8c5fbf9e0f2bac1b37932f7dce55b9"}