{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1999:YNOLBMVIHTWXJOF7QPBDGS32TK","short_pith_number":"pith:YNOLBMVI","canonical_record":{"source":{"id":"nucl-ex/9907020","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"nucl-ex","submitted_at":"1999-07-30T13:25:40Z","cross_cats_sorted":[],"title_canon_sha256":"ed291f172a490aad894f40c88e8f8ccf7ba581bff5664ed7882864d06e737052","abstract_canon_sha256":"bd01c01fc914c59f1a69be37b61c20e93a10d08dbea0db374badafeac054de45"},"schema_version":"1.0"},"canonical_sha256":"c35cb0b2a83ced74b8bf83c2334b7a9aacf20369481104994742ff32b8f136ce","source":{"kind":"arxiv","id":"nucl-ex/9907020","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"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1999:YNOLBMVIHTWXJOF7QPBDGS32TK","target":"record","payload":{"canonical_record":{"source":{"id":"nucl-ex/9907020","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"nucl-ex","submitted_at":"1999-07-30T13:25:40Z","cross_cats_sorted":[],"title_canon_sha256":"ed291f172a490aad894f40c88e8f8ccf7ba581bff5664ed7882864d06e737052","abstract_canon_sha256":"bd01c01fc914c59f1a69be37b61c20e93a10d08dbea0db374badafeac054de45"},"schema_version":"1.0"},"canonical_sha256":"c35cb0b2a83ced74b8bf83c2334b7a9aacf20369481104994742ff32b8f136ce","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:19:57.738064Z","signature_b64":"ysWtmxz51hm+9tTWWfY5ODVDHF6r82EAGk58wmS69WD63hnU/uFStLOJVdqcDgn4C/5NCf8jbotw5IuC/7BbDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c35cb0b2a83ced74b8bf83c2334b7a9aacf20369481104994742ff32b8f136ce","last_reissued_at":"2026-05-18T03:19:57.737553Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:19:57.737553Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"nucl-ex/9907020","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:19:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lpgYO7zcTsTCVZv+TpgX9eT9r5zqUsJF+aEt7lQL7K7+kQNa61DcwrcSY9yfarSzvoTu4zbEN6ZtyPvMC4G2Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T07:58:39.108563Z"},"content_sha256":"bfc68740e9e7a1d701769777fd54f785027c4da86703c2b879525acb55655eb5","schema_version":"1.0","event_id":"sha256:bfc68740e9e7a1d701769777fd54f785027c4da86703c2b879525acb55655eb5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1999:YNOLBMVIHTWXJOF7QPBDGS32TK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Coherent \\pi^\\circ photoproduction from ^4He","license":"","headline":"","cross_cats":[],"primary_cat":"nucl-ex","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","submitted_at":"1999-07-30T13:25:40Z","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"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"nucl-ex/9907020","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:19:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fk+7QtAimXD0197RNJifomqgg/Tr8sLOdnjkKBoUuEK1DnW3r5C/+t+f/8cNiKoZw80dkmFQjTBTnC4k6tt9Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T07:58:39.109269Z"},"content_sha256":"6bb6010b98b1872b64854569d106bc2742aeddaa579691739d70e780ee0a90e8","schema_version":"1.0","event_id":"sha256:6bb6010b98b1872b64854569d106bc2742aeddaa579691739d70e780ee0a90e8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YNOLBMVIHTWXJOF7QPBDGS32TK/bundle.json","state_url":"https://pith.science/pith/YNOLBMVIHTWXJOF7QPBDGS32TK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YNOLBMVIHTWXJOF7QPBDGS32TK/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-25T07:58:39Z","links":{"resolver":"https://pith.science/pith/YNOLBMVIHTWXJOF7QPBDGS32TK","bundle":"https://pith.science/pith/YNOLBMVIHTWXJOF7QPBDGS32TK/bundle.json","state":"https://pith.science/pith/YNOLBMVIHTWXJOF7QPBDGS32TK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YNOLBMVIHTWXJOF7QPBDGS32TK/bundle.json"},"state":{"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"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jkD/TRuQZILbRbsMupq2xE4mz068bRcjRGW0g34E0uY3OgEH2NccmXuulINTsHUFVOylhXOSF2Hwe4mZkR0/Bg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T07:58:39.113148Z","bundle_sha256":"3b22fc527266d4f0634db19e47df7600ed3b7c354158e021580bcb3feaaebe22"}}