{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2010:KWCBE5O2N47N2VZLFMLZBDLBL6","short_pith_number":"pith:KWCBE5O2","schema_version":"1.0","canonical_sha256":"55841275da6f3edd572b2b17908d615f8d14c111f45f85791f1c8f732055754b","source":{"kind":"arxiv","id":"1006.4799","version":1},"attestation_state":"computed","paper":{"title":"Polarization correlations in the two--photon decay of hydrogen--like ions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"Andrey Surzhykov, Filippo Fratini","submitted_at":"2010-06-24T14:21:38Z","abstract_excerpt":"Polarization properties of the photons emitted in the two-photon decay of hydrogen-like ions are studied within the framework of the density matrix and second-order perturbation theory. In particular, we derive the polarization correlation function that gives the probability of the (two-photon) coincidence measurement performed by polarization-sensitive detectors. Detailed calculations of this function are performed for the $2s_{1/2} \\to 1s_{1/2}$ transition in neutral hydrogen as well as Xe$^{53+}$ and U$^{91+}$ ions. The obtained results allow us to understand the influence of relativistic a"},"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":"1006.4799","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2010-06-24T14:21:38Z","cross_cats_sorted":[],"title_canon_sha256":"2a7a86357e050cc91359120faa2f8e4e4e13646cd235a6b63d9cf2a950cfe475","abstract_canon_sha256":"7e5d980d87efdcc8483ba97362af81f2799cd804af0bad6925ea4b9e7a84fa7c"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:15:04.459139Z","signature_b64":"N0cxo7kdnCqtNE2EbUMwOhmK8XoHBdkayn25j2Xr08jIVOyfbdAxuil4sxdkKPqe4yUESFxGOeI/G0eRv2TxAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"55841275da6f3edd572b2b17908d615f8d14c111f45f85791f1c8f732055754b","last_reissued_at":"2026-05-18T04:15:04.458411Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:15:04.458411Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Polarization correlations in the two--photon decay of hydrogen--like ions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"Andrey Surzhykov, Filippo Fratini","submitted_at":"2010-06-24T14:21:38Z","abstract_excerpt":"Polarization properties of the photons emitted in the two-photon decay of hydrogen-like ions are studied within the framework of the density matrix and second-order perturbation theory. In particular, we derive the polarization correlation function that gives the probability of the (two-photon) coincidence measurement performed by polarization-sensitive detectors. Detailed calculations of this function are performed for the $2s_{1/2} \\to 1s_{1/2}$ transition in neutral hydrogen as well as Xe$^{53+}$ and U$^{91+}$ ions. The obtained results allow us to understand the influence of relativistic a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1006.4799","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1006.4799","created_at":"2026-05-18T04:15:04.458531+00:00"},{"alias_kind":"arxiv_version","alias_value":"1006.4799v1","created_at":"2026-05-18T04:15:04.458531+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1006.4799","created_at":"2026-05-18T04:15:04.458531+00:00"},{"alias_kind":"pith_short_12","alias_value":"KWCBE5O2N47N","created_at":"2026-05-18T12:26:09.077623+00:00"},{"alias_kind":"pith_short_16","alias_value":"KWCBE5O2N47N2VZL","created_at":"2026-05-18T12:26:09.077623+00:00"},{"alias_kind":"pith_short_8","alias_value":"KWCBE5O2","created_at":"2026-05-18T12:26:09.077623+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/KWCBE5O2N47N2VZLFMLZBDLBL6","json":"https://pith.science/pith/KWCBE5O2N47N2VZLFMLZBDLBL6.json","graph_json":"https://pith.science/api/pith-number/KWCBE5O2N47N2VZLFMLZBDLBL6/graph.json","events_json":"https://pith.science/api/pith-number/KWCBE5O2N47N2VZLFMLZBDLBL6/events.json","paper":"https://pith.science/paper/KWCBE5O2"},"agent_actions":{"view_html":"https://pith.science/pith/KWCBE5O2N47N2VZLFMLZBDLBL6","download_json":"https://pith.science/pith/KWCBE5O2N47N2VZLFMLZBDLBL6.json","view_paper":"https://pith.science/paper/KWCBE5O2","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1006.4799&json=true","fetch_graph":"https://pith.science/api/pith-number/KWCBE5O2N47N2VZLFMLZBDLBL6/graph.json","fetch_events":"https://pith.science/api/pith-number/KWCBE5O2N47N2VZLFMLZBDLBL6/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/KWCBE5O2N47N2VZLFMLZBDLBL6/action/timestamp_anchor","attest_storage":"https://pith.science/pith/KWCBE5O2N47N2VZLFMLZBDLBL6/action/storage_attestation","attest_author":"https://pith.science/pith/KWCBE5O2N47N2VZLFMLZBDLBL6/action/author_attestation","sign_citation":"https://pith.science/pith/KWCBE5O2N47N2VZLFMLZBDLBL6/action/citation_signature","submit_replication":"https://pith.science/pith/KWCBE5O2N47N2VZLFMLZBDLBL6/action/replication_record"}},"created_at":"2026-05-18T04:15:04.458531+00:00","updated_at":"2026-05-18T04:15:04.458531+00:00"}