{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1999:YNOLBMVIHTWXJOF7QPBDGS32TK","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":"bd01c01fc914c59f1a69be37b61c20e93a10d08dbea0db374badafeac054de45","cross_cats_sorted":[],"license":"","primary_cat":"nucl-ex","submitted_at":"1999-07-30T13:25:40Z","title_canon_sha256":"ed291f172a490aad894f40c88e8f8ccf7ba581bff5664ed7882864d06e737052"},"schema_version":"1.0","source":{"id":"nucl-ex/9907020","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"nucl-ex/9907020","created_at":"2026-05-18T03:19:57Z"},{"alias_kind":"arxiv_version","alias_value":"nucl-ex/9907020v1","created_at":"2026-05-18T03:19:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.nucl-ex/9907020","created_at":"2026-05-18T03:19:57Z"},{"alias_kind":"pith_short_12","alias_value":"YNOLBMVIHTWX","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_16","alias_value":"YNOLBMVIHTWXJOF7","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_8","alias_value":"YNOLBMVI","created_at":"2026-05-18T12:25:49Z"}],"graph_snapshots":[{"event_id":"sha256:6bb6010b98b1872b64854569d106bc2742aeddaa579691739d70e780ee0a90e8","target":"graph","created_at":"2026-05-18T03:19:57Z","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"},"paper":{"abstract_excerpt":"Differential cross sections and beam asymmetries for coherent \\pi^\\circ photoproduction from ^4He in the \\Delta energy-range have been measured with high statistical and systematic precisions using both decay photons for identifying the process.The experiment was performed at the MAinz MIcrotron using the TAPS photon spectrometer and the Glasgow/Mainz tagged photon facility. The differential cross sections are in excellent agreement with predictions based on the DWIA if an appropriate parametrization of the \\Delta-nuclear interaction is applied. The beam asymmetries are interpreted in terms of","authors_text":"A. Schmidt, B. Krusche, F. Rambo, F. Smend, F. Wissmann, H.-J. Arends, H. Str\"oher, J. Ahrens, J. Weiss, M. Kotulla, M. Schumacher, M. Wolf, P. Achenbach, P. Jennewein, R. Beck, R. Leukel, R. Novotny, S.J. Hall, S.S. Kamalov, U. Siodlaczek, V. Hejny, V. Kuhr, V. Metag, V. Olmos de Leon","cross_cats":[],"headline":"","license":"","primary_cat":"nucl-ex","submitted_at":"1999-07-30T13:25:40Z","title":"Coherent \\pi^\\circ photoproduction from ^4He"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"nucl-ex/9907020","kind":"arxiv","version":1},"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:bfc68740e9e7a1d701769777fd54f785027c4da86703c2b879525acb55655eb5","target":"record","created_at":"2026-05-18T03:19:57Z","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":"bd01c01fc914c59f1a69be37b61c20e93a10d08dbea0db374badafeac054de45","cross_cats_sorted":[],"license":"","primary_cat":"nucl-ex","submitted_at":"1999-07-30T13:25:40Z","title_canon_sha256":"ed291f172a490aad894f40c88e8f8ccf7ba581bff5664ed7882864d06e737052"},"schema_version":"1.0","source":{"id":"nucl-ex/9907020","kind":"arxiv","version":1}},"canonical_sha256":"c35cb0b2a83ced74b8bf83c2334b7a9aacf20369481104994742ff32b8f136ce","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c35cb0b2a83ced74b8bf83c2334b7a9aacf20369481104994742ff32b8f136ce","first_computed_at":"2026-05-18T03:19:57.737553Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:19:57.737553Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ysWtmxz51hm+9tTWWfY5ODVDHF6r82EAGk58wmS69WD63hnU/uFStLOJVdqcDgn4C/5NCf8jbotw5IuC/7BbDw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:19:57.738064Z","signed_message":"canonical_sha256_bytes"},"source_id":"nucl-ex/9907020","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bfc68740e9e7a1d701769777fd54f785027c4da86703c2b879525acb55655eb5","sha256:6bb6010b98b1872b64854569d106bc2742aeddaa579691739d70e780ee0a90e8"],"state_sha256":"1e829eaf8b9b9b1c58225410d89320f7877ae6a430cdd4b24afd3348f7599377"}