{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2009:OPWFEMWWC5RX44BIBMDMZLLNDO","short_pith_number":"pith:OPWFEMWW","schema_version":"1.0","canonical_sha256":"73ec5232d617637e70280b06ccad6d1b96f5e20780f614e91eaaa8afb8d0118e","source":{"kind":"arxiv","id":"0910.3459","version":1},"attestation_state":"computed","paper":{"title":"Enhanced sensitivity to the fine-structure constant variation in Th IV atomic clock transition","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"S.G. Porsev, V.V. Flambaum","submitted_at":"2009-10-19T05:13:34Z","abstract_excerpt":"Our calculations have shown that the 5f_5/2-7s_1/2 23131 cm^{-1} transition from the ground state in the ion Th^{3+} is very sensitive to the temporal variation of the fine structure constant alpha (q=-75300 cm^{-1}). The line is very narrow, the ion has been trapped and laser cooled and the positive shifter line 5f_5/2-5f_7/2 4325 cm^{-1} (q=+2900 cm^{-1}) may be used as a reference. A comparison may also be made with a positive shifter in another atom or ion. This makes Th^{3+} a good candidate to search for the alpha variation."},"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":"0910.3459","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2009-10-19T05:13:34Z","cross_cats_sorted":[],"title_canon_sha256":"4dd6b48e10c5ffa143f2b0ce1d6dfaa6420373cc7f0f2a4ebe8d649a24a40261","abstract_canon_sha256":"d78a4d285fa9e338d5f83483760be88880505c308913051f7ff397ba0c7054ce"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T17:27:28.052596Z","signature_b64":"cpfI9JFpMXlSJIHKFPiJ7yDKdcuR0SDOipFFGrM3vrXINKxagMIYHnI8M5G+rl0+oXy4ksNkoE019BJAquO9AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"73ec5232d617637e70280b06ccad6d1b96f5e20780f614e91eaaa8afb8d0118e","last_reissued_at":"2026-07-04T17:27:28.052171Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T17:27:28.052171Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Enhanced sensitivity to the fine-structure constant variation in Th IV atomic clock transition","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"S.G. Porsev, V.V. Flambaum","submitted_at":"2009-10-19T05:13:34Z","abstract_excerpt":"Our calculations have shown that the 5f_5/2-7s_1/2 23131 cm^{-1} transition from the ground state in the ion Th^{3+} is very sensitive to the temporal variation of the fine structure constant alpha (q=-75300 cm^{-1}). The line is very narrow, the ion has been trapped and laser cooled and the positive shifter line 5f_5/2-5f_7/2 4325 cm^{-1} (q=+2900 cm^{-1}) may be used as a reference. A comparison may also be made with a positive shifter in another atom or ion. This makes Th^{3+} a good candidate to search for the alpha variation."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0910.3459","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/0910.3459/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":"0910.3459","created_at":"2026-07-04T17:27:28.052233+00:00"},{"alias_kind":"arxiv_version","alias_value":"0910.3459v1","created_at":"2026-07-04T17:27:28.052233+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0910.3459","created_at":"2026-07-04T17:27:28.052233+00:00"},{"alias_kind":"pith_short_12","alias_value":"OPWFEMWWC5RX","created_at":"2026-07-04T17:27:28.052233+00:00"},{"alias_kind":"pith_short_16","alias_value":"OPWFEMWWC5RX44BI","created_at":"2026-07-04T17:27:28.052233+00:00"},{"alias_kind":"pith_short_8","alias_value":"OPWFEMWW","created_at":"2026-07-04T17:27:28.052233+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2412.18308","citing_title":"Using the Th III Ion for a Nuclear Clock and Searches for New Physics","ref_index":39,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/OPWFEMWWC5RX44BIBMDMZLLNDO","json":"https://pith.science/pith/OPWFEMWWC5RX44BIBMDMZLLNDO.json","graph_json":"https://pith.science/api/pith-number/OPWFEMWWC5RX44BIBMDMZLLNDO/graph.json","events_json":"https://pith.science/api/pith-number/OPWFEMWWC5RX44BIBMDMZLLNDO/events.json","paper":"https://pith.science/paper/OPWFEMWW"},"agent_actions":{"view_html":"https://pith.science/pith/OPWFEMWWC5RX44BIBMDMZLLNDO","download_json":"https://pith.science/pith/OPWFEMWWC5RX44BIBMDMZLLNDO.json","view_paper":"https://pith.science/paper/OPWFEMWW","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=0910.3459&json=true","fetch_graph":"https://pith.science/api/pith-number/OPWFEMWWC5RX44BIBMDMZLLNDO/graph.json","fetch_events":"https://pith.science/api/pith-number/OPWFEMWWC5RX44BIBMDMZLLNDO/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/OPWFEMWWC5RX44BIBMDMZLLNDO/action/timestamp_anchor","attest_storage":"https://pith.science/pith/OPWFEMWWC5RX44BIBMDMZLLNDO/action/storage_attestation","attest_author":"https://pith.science/pith/OPWFEMWWC5RX44BIBMDMZLLNDO/action/author_attestation","sign_citation":"https://pith.science/pith/OPWFEMWWC5RX44BIBMDMZLLNDO/action/citation_signature","submit_replication":"https://pith.science/pith/OPWFEMWWC5RX44BIBMDMZLLNDO/action/replication_record"}},"created_at":"2026-07-04T17:27:28.052233+00:00","updated_at":"2026-07-04T17:27:28.052233+00:00"}