{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2007:MRM5PVXNBWQKLVEUAULLIBGIQ2","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":"3a5f9ad6f7cd712e68d6e9c9f5b72becbac97dc796a73c08e1329f923940f7a2","cross_cats_sorted":[],"license":"","primary_cat":"nucl-ex","submitted_at":"2007-11-12T18:18:49Z","title_canon_sha256":"fa5411aa69ec16443c9c87cdf3cd1644af155ca62c1ce5094ba04d83f18852dd"},"schema_version":"1.0","source":{"id":"0711.1839","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0711.1839","created_at":"2026-07-04T15:23:44Z"},{"alias_kind":"arxiv_version","alias_value":"0711.1839v1","created_at":"2026-07-04T15:23:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0711.1839","created_at":"2026-07-04T15:23:44Z"},{"alias_kind":"pith_short_12","alias_value":"MRM5PVXNBWQK","created_at":"2026-07-04T15:23:44Z"},{"alias_kind":"pith_short_16","alias_value":"MRM5PVXNBWQKLVEU","created_at":"2026-07-04T15:23:44Z"},{"alias_kind":"pith_short_8","alias_value":"MRM5PVXN","created_at":"2026-07-04T15:23:44Z"}],"graph_snapshots":[{"event_id":"sha256:f0ff5f53e0375cf0f94cb338034388b0c3b0d5143b6336f715dd4f527a2e796a","target":"graph","created_at":"2026-07-04T15:23:44Z","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/0711.1839/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present the first detailed measurement of incoherent photoproduction of neutral pions to a discrete state of a residual nucleus. The $^{12}$C$(\\gamma,\\pi^{0})^{12}$C$^{*}_{4.4MeV}$ reaction has been studied with the Glasgow photon tagger at MAMI employing a new technique which uses the large solid angle Crystal Ball detector both as a $\\pi^{0}$ spectrometer and to detect decay photons from the excited residual nucleus. The technique has potential applications to a broad range of future nuclear measurements with the Crystal Ball and similar detector systems elsewhere. The data are sensitive ","authors_text":"A. Braghieri, A. Knezevic, A. Nikolaev, A. Polonski, A. Starostin, A. Thomas, B. Boillat, B. Krusche, B.M.K. Nefkens, C.M. Tarbert, D. Branford, D. Hornidge, D.I. Glazier, D. Krambrich, D. Mekterovic, D.M. Manley, D.P. Watts, D. Sober, E. Heid, E.J. Downie, F. Zehr, G. Rosner, H.J. Arends, I.J.D. MacGregor, I. Supek, J. Ahrens, J. Brudvik, J.C. McGeorge, J.R.M. Annand, J.W. Price, K. Foehl, K. Livingston, M. Korolija, M. Kotulla, M. Lang, M. Martinez, M. Rost, M. Unverzagt, O. Jahn, P. Aguar, P. Grabmayr, P. Pedroni, R. Beck, R. Codling, R. Gregor, R. Kondratiev, R. Novotny, R.O. Owens, S. Cherepnya, S. Lugert, S.N. Prakhov, S. Schadmand, S. Schumann, Th. Walcher, T. Rostomyan, V. Bekrenev, V. Lisin, V.L. Kashevarov, V. Metag, W.J. Briscoe","cross_cats":[],"headline":"","license":"","primary_cat":"nucl-ex","submitted_at":"2007-11-12T18:18:49Z","title":"Incoherent pion photoproduction on $^{12}$C"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0711.1839","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":"sha256:8d103ee5db413fc6768b2bade46880718341b25ee548292edb83ab45962022d9","target":"record","created_at":"2026-07-04T15:23:44Z","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":"3a5f9ad6f7cd712e68d6e9c9f5b72becbac97dc796a73c08e1329f923940f7a2","cross_cats_sorted":[],"license":"","primary_cat":"nucl-ex","submitted_at":"2007-11-12T18:18:49Z","title_canon_sha256":"fa5411aa69ec16443c9c87cdf3cd1644af155ca62c1ce5094ba04d83f18852dd"},"schema_version":"1.0","source":{"id":"0711.1839","kind":"arxiv","version":1}},"canonical_sha256":"6459d7d6ed0da0a5d4940516b404c886bc2bf95b013317ba86e9a0e6b42fe93c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6459d7d6ed0da0a5d4940516b404c886bc2bf95b013317ba86e9a0e6b42fe93c","first_computed_at":"2026-07-04T15:23:44.193374Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:23:44.193374Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"x/IgvKFMZceZniU9octu9BOJxsTj2HD3eGLLkD0fRdkLLBKsDiP28R4csxn3HvqvhD4Wyb+iDiZp7hpECn9ABQ==","signature_status":"signed_v1","signed_at":"2026-07-04T15:23:44.193785Z","signed_message":"canonical_sha256_bytes"},"source_id":"0711.1839","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8d103ee5db413fc6768b2bade46880718341b25ee548292edb83ab45962022d9","sha256:f0ff5f53e0375cf0f94cb338034388b0c3b0d5143b6336f715dd4f527a2e796a"],"state_sha256":"7d46f9d892486846643fc5047a82d1a678291584e1bf8307b9fd1d83f6ff3a17"}