{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2009:UEQPJZ7GCDL3F7L4UIAZXI4JVO","short_pith_number":"pith:UEQPJZ7G","schema_version":"1.0","canonical_sha256":"a120f4e7e610d7b2fd7ca2019ba389abaf05a8aa476f7170e21a52f88db72483","source":{"kind":"arxiv","id":"0909.3538","version":2},"attestation_state":"computed","paper":{"title":"On the cross section ratio sigma_n/sigma_p in eta photoproduction","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-th","authors_text":"K. Nakayama, M. D\\\"oring","submitted_at":"2009-09-18T22:05:47Z","abstract_excerpt":"The recently discovered enhancement of eta photoproduction on the quasi-free neutron at energies around sqrt(s)~1.67 GeV is addressed within a SU(3) coupled channel model. The quasi-free cross sections on proton and neutron, sigma_n and sigma_p, can be quantitatively explained. In this study, the main source for the peak in sigma_n/sigma_p is a coupled channel effect in S-wave that explains the dip-bump structure in gamma n --> eta n. In particular, the photon coupling to the intermediate meson-baryon states is important. The stability of the result is extensively tested and consistency with s"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"0909.3538","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2009-09-18T22:05:47Z","cross_cats_sorted":[],"title_canon_sha256":"3dfb2fc16b8d3f32e536701248b27140a3529463f194c0028db968ccf212dd35","abstract_canon_sha256":"e62a0e0336991c64a36ae863dfe942b8b8f1537f981fe2fede5e49514d718ef7"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T17:19:32.888305Z","signature_b64":"/4ufTiPwfl/hrP580oEGJO1b4DrZzcxp8oFWDLw4Qr+WXl9eSStUXLg6TeKDkW4yONie6PcumJqDV8HQSBR1AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a120f4e7e610d7b2fd7ca2019ba389abaf05a8aa476f7170e21a52f88db72483","last_reissued_at":"2026-07-04T17:19:32.887898Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T17:19:32.887898Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"On the cross section ratio sigma_n/sigma_p in eta photoproduction","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-th","authors_text":"K. Nakayama, M. D\\\"oring","submitted_at":"2009-09-18T22:05:47Z","abstract_excerpt":"The recently discovered enhancement of eta photoproduction on the quasi-free neutron at energies around sqrt(s)~1.67 GeV is addressed within a SU(3) coupled channel model. The quasi-free cross sections on proton and neutron, sigma_n and sigma_p, can be quantitatively explained. In this study, the main source for the peak in sigma_n/sigma_p is a coupled channel effect in S-wave that explains the dip-bump structure in gamma n --> eta n. In particular, the photon coupling to the intermediate meson-baryon states is important. The stability of the result is extensively tested and consistency with s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.3538","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/0909.3538/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"0909.3538","created_at":"2026-07-04T17:19:32.887963+00:00"},{"alias_kind":"arxiv_version","alias_value":"0909.3538v2","created_at":"2026-07-04T17:19:32.887963+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.3538","created_at":"2026-07-04T17:19:32.887963+00:00"},{"alias_kind":"pith_short_12","alias_value":"UEQPJZ7GCDL3","created_at":"2026-07-04T17:19:32.887963+00:00"},{"alias_kind":"pith_short_16","alias_value":"UEQPJZ7GCDL3F7L4","created_at":"2026-07-04T17:19:32.887963+00:00"},{"alias_kind":"pith_short_8","alias_value":"UEQPJZ7G","created_at":"2026-07-04T17:19:32.887963+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2411.13292","citing_title":"Pentaquarks and Maxim V. Polyakov","ref_index":74,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/UEQPJZ7GCDL3F7L4UIAZXI4JVO","json":"https://pith.science/pith/UEQPJZ7GCDL3F7L4UIAZXI4JVO.json","graph_json":"https://pith.science/api/pith-number/UEQPJZ7GCDL3F7L4UIAZXI4JVO/graph.json","events_json":"https://pith.science/api/pith-number/UEQPJZ7GCDL3F7L4UIAZXI4JVO/events.json","paper":"https://pith.science/paper/UEQPJZ7G"},"agent_actions":{"view_html":"https://pith.science/pith/UEQPJZ7GCDL3F7L4UIAZXI4JVO","download_json":"https://pith.science/pith/UEQPJZ7GCDL3F7L4UIAZXI4JVO.json","view_paper":"https://pith.science/paper/UEQPJZ7G","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=0909.3538&json=true","fetch_graph":"https://pith.science/api/pith-number/UEQPJZ7GCDL3F7L4UIAZXI4JVO/graph.json","fetch_events":"https://pith.science/api/pith-number/UEQPJZ7GCDL3F7L4UIAZXI4JVO/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/UEQPJZ7GCDL3F7L4UIAZXI4JVO/action/timestamp_anchor","attest_storage":"https://pith.science/pith/UEQPJZ7GCDL3F7L4UIAZXI4JVO/action/storage_attestation","attest_author":"https://pith.science/pith/UEQPJZ7GCDL3F7L4UIAZXI4JVO/action/author_attestation","sign_citation":"https://pith.science/pith/UEQPJZ7GCDL3F7L4UIAZXI4JVO/action/citation_signature","submit_replication":"https://pith.science/pith/UEQPJZ7GCDL3F7L4UIAZXI4JVO/action/replication_record"}},"created_at":"2026-07-04T17:19:32.887963+00:00","updated_at":"2026-07-04T17:19:32.887963+00:00"}