{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1999:QN5JBTHO5SVLDVQ4PEWF5IHUCG","short_pith_number":"pith:QN5JBTHO","canonical_record":{"source":{"id":"nucl-th/9906019","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"nucl-th","submitted_at":"1999-06-08T11:08:26Z","cross_cats_sorted":[],"title_canon_sha256":"230ab74cd51833ec8e074a1c7be86a4e0a112c5a90c7e194ff8e78a7e900e1c0","abstract_canon_sha256":"06fb28f985e0d4d1b7830e071dad4a4bfc24d6a2adf2f3bc8c83fb702fedf9d6"},"schema_version":"1.0"},"canonical_sha256":"837a90cceeecaab1d61c792c5ea0f411aa54c2722741d050e2c05119a13c5f7e","source":{"kind":"arxiv","id":"nucl-th/9906019","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"nucl-th/9906019","created_at":"2026-05-18T04:17:26Z"},{"alias_kind":"arxiv_version","alias_value":"nucl-th/9906019v1","created_at":"2026-05-18T04:17:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.nucl-th/9906019","created_at":"2026-05-18T04:17:26Z"},{"alias_kind":"pith_short_12","alias_value":"QN5JBTHO5SVL","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_16","alias_value":"QN5JBTHO5SVLDVQ4","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_8","alias_value":"QN5JBTHO","created_at":"2026-05-18T12:25:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1999:QN5JBTHO5SVLDVQ4PEWF5IHUCG","target":"record","payload":{"canonical_record":{"source":{"id":"nucl-th/9906019","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"nucl-th","submitted_at":"1999-06-08T11:08:26Z","cross_cats_sorted":[],"title_canon_sha256":"230ab74cd51833ec8e074a1c7be86a4e0a112c5a90c7e194ff8e78a7e900e1c0","abstract_canon_sha256":"06fb28f985e0d4d1b7830e071dad4a4bfc24d6a2adf2f3bc8c83fb702fedf9d6"},"schema_version":"1.0"},"canonical_sha256":"837a90cceeecaab1d61c792c5ea0f411aa54c2722741d050e2c05119a13c5f7e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:17:26.108875Z","signature_b64":"82c7zL5ryCuheeGL1THt7NhcShV/t/wJUXSNAe6G6oYT5x+6l+eCzWPX2M3+rBkvQqu20F08KmX9WvlONxvFCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"837a90cceeecaab1d61c792c5ea0f411aa54c2722741d050e2c05119a13c5f7e","last_reissued_at":"2026-05-18T04:17:26.108229Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:17:26.108229Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"nucl-th/9906019","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":"2026-05-18T04:17:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5yzjhZaVh9pJyZ15FzZXQMNGHpzWFC2RHBTDPbMKQZxWoQT1Wm+bhdjRzkSq96Z96GEZRASfLz5aygnwoeIiDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T05:17:36.184507Z"},"content_sha256":"b3950143187059eea106798c125c421ce169e4fce53000bf2a2137f3f621fdff","schema_version":"1.0","event_id":"sha256:b3950143187059eea106798c125c421ce169e4fce53000bf2a2137f3f621fdff"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1999:QN5JBTHO5SVLDVQ4PEWF5IHUCG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Medium Effects in Coherent Pion Photo- and Electroproduction on 4He and 12C","license":"","headline":"","cross_cats":[],"primary_cat":"nucl-th","authors_text":"D. Drechsel, L. Tiator (Universitaet Mainz), Shin Nan Yang (NTU Taipei), S.S. Kamalov (JINR Dubna)","submitted_at":"1999-06-08T11:08:26Z","abstract_excerpt":"Coherent pi0 photo- and electroproduction on 4He and 12C nuclei is investigated in the framework of a distorted wave impulse approximation in momentum space. The elementary process is described by the recently developed unitary isobar model. Medium effects are considered by introducing a phenomenological Delta self-energy. The recent experimental data for 4He and 12C can be well described over a wide range of energies and emission angles by the assumption that the Delta-nuclear interaction saturates."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"nucl-th/9906019","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":"2026-05-18T04:17:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"V6zClZZC/5+Ul0BF5V+UK6/wokRHHeyD1hgxLdTl2UoL698iepi0I9PAfuyFM90UEVz0zvsJn+aqbjCN8mKDDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T05:17:36.184887Z"},"content_sha256":"99b56dce2098af19b910c4456c7a8b9d082ef2c7926a7f32a79f117e700f7065","schema_version":"1.0","event_id":"sha256:99b56dce2098af19b910c4456c7a8b9d082ef2c7926a7f32a79f117e700f7065"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QN5JBTHO5SVLDVQ4PEWF5IHUCG/bundle.json","state_url":"https://pith.science/pith/QN5JBTHO5SVLDVQ4PEWF5IHUCG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QN5JBTHO5SVLDVQ4PEWF5IHUCG/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":"2026-06-04T05:17:36Z","links":{"resolver":"https://pith.science/pith/QN5JBTHO5SVLDVQ4PEWF5IHUCG","bundle":"https://pith.science/pith/QN5JBTHO5SVLDVQ4PEWF5IHUCG/bundle.json","state":"https://pith.science/pith/QN5JBTHO5SVLDVQ4PEWF5IHUCG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QN5JBTHO5SVLDVQ4PEWF5IHUCG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1999:QN5JBTHO5SVLDVQ4PEWF5IHUCG","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":"06fb28f985e0d4d1b7830e071dad4a4bfc24d6a2adf2f3bc8c83fb702fedf9d6","cross_cats_sorted":[],"license":"","primary_cat":"nucl-th","submitted_at":"1999-06-08T11:08:26Z","title_canon_sha256":"230ab74cd51833ec8e074a1c7be86a4e0a112c5a90c7e194ff8e78a7e900e1c0"},"schema_version":"1.0","source":{"id":"nucl-th/9906019","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"nucl-th/9906019","created_at":"2026-05-18T04:17:26Z"},{"alias_kind":"arxiv_version","alias_value":"nucl-th/9906019v1","created_at":"2026-05-18T04:17:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.nucl-th/9906019","created_at":"2026-05-18T04:17:26Z"},{"alias_kind":"pith_short_12","alias_value":"QN5JBTHO5SVL","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_16","alias_value":"QN5JBTHO5SVLDVQ4","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_8","alias_value":"QN5JBTHO","created_at":"2026-05-18T12:25:49Z"}],"graph_snapshots":[{"event_id":"sha256:99b56dce2098af19b910c4456c7a8b9d082ef2c7926a7f32a79f117e700f7065","target":"graph","created_at":"2026-05-18T04:17:26Z","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":"Coherent pi0 photo- and electroproduction on 4He and 12C nuclei is investigated in the framework of a distorted wave impulse approximation in momentum space. The elementary process is described by the recently developed unitary isobar model. Medium effects are considered by introducing a phenomenological Delta self-energy. The recent experimental data for 4He and 12C can be well described over a wide range of energies and emission angles by the assumption that the Delta-nuclear interaction saturates.","authors_text":"D. Drechsel, L. Tiator (Universitaet Mainz), Shin Nan Yang (NTU Taipei), S.S. Kamalov (JINR Dubna)","cross_cats":[],"headline":"","license":"","primary_cat":"nucl-th","submitted_at":"1999-06-08T11:08:26Z","title":"Medium Effects in Coherent Pion Photo- and Electroproduction on 4He and 12C"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"nucl-th/9906019","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:b3950143187059eea106798c125c421ce169e4fce53000bf2a2137f3f621fdff","target":"record","created_at":"2026-05-18T04:17:26Z","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":"06fb28f985e0d4d1b7830e071dad4a4bfc24d6a2adf2f3bc8c83fb702fedf9d6","cross_cats_sorted":[],"license":"","primary_cat":"nucl-th","submitted_at":"1999-06-08T11:08:26Z","title_canon_sha256":"230ab74cd51833ec8e074a1c7be86a4e0a112c5a90c7e194ff8e78a7e900e1c0"},"schema_version":"1.0","source":{"id":"nucl-th/9906019","kind":"arxiv","version":1}},"canonical_sha256":"837a90cceeecaab1d61c792c5ea0f411aa54c2722741d050e2c05119a13c5f7e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"837a90cceeecaab1d61c792c5ea0f411aa54c2722741d050e2c05119a13c5f7e","first_computed_at":"2026-05-18T04:17:26.108229Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:17:26.108229Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"82c7zL5ryCuheeGL1THt7NhcShV/t/wJUXSNAe6G6oYT5x+6l+eCzWPX2M3+rBkvQqu20F08KmX9WvlONxvFCw==","signature_status":"signed_v1","signed_at":"2026-05-18T04:17:26.108875Z","signed_message":"canonical_sha256_bytes"},"source_id":"nucl-th/9906019","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b3950143187059eea106798c125c421ce169e4fce53000bf2a2137f3f621fdff","sha256:99b56dce2098af19b910c4456c7a8b9d082ef2c7926a7f32a79f117e700f7065"],"state_sha256":"259100a08aae2aeb73ba978dc0422144950e599fac210b726f1bbadde40de79d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qMuodCqR5Ipv1aw66NKeibD8/nbCfKo/DQ5qAD7C6/FfSydFdFvsBWC84a9ywkcVs2nZoWob+1DBDwBpzjIeCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T05:17:36.187137Z","bundle_sha256":"67c257a6c47cb4bc93f56d92e151472466752262abec3fcace3ef9f4f651a858"}}