{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2025:AA3FBJEH7SSK6VLJQ7VPRULVMC","short_pith_number":"pith:AA3FBJEH","schema_version":"1.0","canonical_sha256":"003650a487fca4af556987eaf8d17560a51e67aceb671c575320373bd8d58856","source":{"kind":"arxiv","id":"2503.04081","version":2},"attestation_state":"computed","paper":{"title":"Nuclear clock based on the Th V ion","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"E.Peik, V. A. Dzuba, V. V. Flambaum","submitted_at":"2025-03-06T04:34:41Z","abstract_excerpt":"We propose that a nuclear clock based on the Th V ion can surpass the accuracy of clocks built with other thorium ions. The Th$^{4+}$ ion has a rigid closed-shell core with zero total electron angular momentum, suppressing frequency shifts from black-body radiation and stray external fields that act mainly on electrons. We calculate the energy shift of the nuclear clock transition frequency in $^{229}$Th due to the Coulomb field of atomic electrons and find a relative frequency difference of $2.8 \\times 10^{-7}$ between Th IV and Th V - twelve orders of magnitude larger than the projected $10^"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2503.04081","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.atom-ph","submitted_at":"2025-03-06T04:34:41Z","cross_cats_sorted":[],"title_canon_sha256":"ccceea31a443abfb75eb1ac37d3eb483f4ce20147e4a879a01a38980976c2e73","abstract_canon_sha256":"14a6b35668d82661c612346654f0b6171ba5c99204f1b4c601e9f3c776f0cc2c"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:47:19.686985Z","signature_b64":"maR5AqTLo9WbuvsmoBeYTE0KxpS/yvgyNypLchxia2hCkOqnv53qVc5Wq54mFIZnC7wHvJc+8wTXLktM01WXCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"003650a487fca4af556987eaf8d17560a51e67aceb671c575320373bd8d58856","last_reissued_at":"2026-07-05T11:47:19.686544Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:47:19.686544Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Nuclear clock based on the Th V ion","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"E.Peik, V. A. Dzuba, V. V. Flambaum","submitted_at":"2025-03-06T04:34:41Z","abstract_excerpt":"We propose that a nuclear clock based on the Th V ion can surpass the accuracy of clocks built with other thorium ions. The Th$^{4+}$ ion has a rigid closed-shell core with zero total electron angular momentum, suppressing frequency shifts from black-body radiation and stray external fields that act mainly on electrons. We calculate the energy shift of the nuclear clock transition frequency in $^{229}$Th due to the Coulomb field of atomic electrons and find a relative frequency difference of $2.8 \\times 10^{-7}$ between Th IV and Th V - twelve orders of magnitude larger than the projected $10^"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2503.04081","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/2503.04081/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":"2503.04081","created_at":"2026-07-05T11:47:19.686601+00:00"},{"alias_kind":"arxiv_version","alias_value":"2503.04081v2","created_at":"2026-07-05T11:47:19.686601+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2503.04081","created_at":"2026-07-05T11:47:19.686601+00:00"},{"alias_kind":"pith_short_12","alias_value":"AA3FBJEH7SSK","created_at":"2026-07-05T11:47:19.686601+00:00"},{"alias_kind":"pith_short_16","alias_value":"AA3FBJEH7SSK6VLJ","created_at":"2026-07-05T11:47:19.686601+00:00"},{"alias_kind":"pith_short_8","alias_value":"AA3FBJEH","created_at":"2026-07-05T11:47:19.686601+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":0,"sample":[{"citing_arxiv_id":"2510.23808","citing_title":"Towards theory constraints on ultralight dark matter from quantum gravity","ref_index":36,"is_internal_anchor":false}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/AA3FBJEH7SSK6VLJQ7VPRULVMC","json":"https://pith.science/pith/AA3FBJEH7SSK6VLJQ7VPRULVMC.json","graph_json":"https://pith.science/api/pith-number/AA3FBJEH7SSK6VLJQ7VPRULVMC/graph.json","events_json":"https://pith.science/api/pith-number/AA3FBJEH7SSK6VLJQ7VPRULVMC/events.json","paper":"https://pith.science/paper/AA3FBJEH"},"agent_actions":{"view_html":"https://pith.science/pith/AA3FBJEH7SSK6VLJQ7VPRULVMC","download_json":"https://pith.science/pith/AA3FBJEH7SSK6VLJQ7VPRULVMC.json","view_paper":"https://pith.science/paper/AA3FBJEH","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2503.04081&json=true","fetch_graph":"https://pith.science/api/pith-number/AA3FBJEH7SSK6VLJQ7VPRULVMC/graph.json","fetch_events":"https://pith.science/api/pith-number/AA3FBJEH7SSK6VLJQ7VPRULVMC/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/AA3FBJEH7SSK6VLJQ7VPRULVMC/action/timestamp_anchor","attest_storage":"https://pith.science/pith/AA3FBJEH7SSK6VLJQ7VPRULVMC/action/storage_attestation","attest_author":"https://pith.science/pith/AA3FBJEH7SSK6VLJQ7VPRULVMC/action/author_attestation","sign_citation":"https://pith.science/pith/AA3FBJEH7SSK6VLJQ7VPRULVMC/action/citation_signature","submit_replication":"https://pith.science/pith/AA3FBJEH7SSK6VLJQ7VPRULVMC/action/replication_record"}},"created_at":"2026-07-05T11:47:19.686601+00:00","updated_at":"2026-07-05T11:47:19.686601+00:00"}