{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2026:GULHG3BUYFIOZFROPZATEBJ3R3","short_pith_number":"pith:GULHG3BU","schema_version":"1.0","canonical_sha256":"3516736c34c150ec962e7e4132053b8eeab80cdafbb6dddfd2b84ff16e1d6ef2","source":{"kind":"arxiv","id":"2606.26600","version":1},"attestation_state":"computed","paper":{"title":"The $^{229}$Th Isomer: Nuclear Structure, Clocks, and Tests of Fundamental Physics","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-th","authors_text":"Rui Zhao, Shan-Gui Zhou, Xiao Lu","submitted_at":"2026-06-25T04:58:56Z","abstract_excerpt":"The $^{229}$Th nucleus possesses an isomeric state at an excitation energy of $\\sim 8$ eV, the lowest known nuclear transition energy, placing its frequency in the vacuum-ultraviolet range and making it directly accessible to laser spectroscopy. In this review, we discuss the $^{229}$Th isomer from three connected perspectives: experimental spectroscopy and clock development, nuclear structure theory, and applications to precision tests of fundamental physics. We first trace the experimental progress from indirect $\\gamma$-ray energy inference to resonant laser excitation, absolute frequency c"},"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":"2606.26600","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2026-06-25T04:58:56Z","cross_cats_sorted":[],"title_canon_sha256":"fb4890d7c8f6b41db6cfc75eb5845334dae5bc608d76753c7e24e5d68535508e","abstract_canon_sha256":"47d087eb56148a2e7ef5d02763cf21a15514a9d6c96565f727ccf91f3ec04699"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-26T01:15:35.925661Z","signature_b64":"fbsaHhGCY/s8YPa7bnU4Yg49JVsTVtBuYfUS34R4bJgHZFg5Hk2evVqdkuLI7BwzBk2aEPuTYO/T3R6eX8vBCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3516736c34c150ec962e7e4132053b8eeab80cdafbb6dddfd2b84ff16e1d6ef2","last_reissued_at":"2026-06-26T01:15:35.925230Z","signature_status":"signed_v1","first_computed_at":"2026-06-26T01:15:35.925230Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The $^{229}$Th Isomer: Nuclear Structure, Clocks, and Tests of Fundamental Physics","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-th","authors_text":"Rui Zhao, Shan-Gui Zhou, Xiao Lu","submitted_at":"2026-06-25T04:58:56Z","abstract_excerpt":"The $^{229}$Th nucleus possesses an isomeric state at an excitation energy of $\\sim 8$ eV, the lowest known nuclear transition energy, placing its frequency in the vacuum-ultraviolet range and making it directly accessible to laser spectroscopy. In this review, we discuss the $^{229}$Th isomer from three connected perspectives: experimental spectroscopy and clock development, nuclear structure theory, and applications to precision tests of fundamental physics. We first trace the experimental progress from indirect $\\gamma$-ray energy inference to resonant laser excitation, absolute frequency c"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.26600","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/2606.26600/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":"2606.26600","created_at":"2026-06-26T01:15:35.925285+00:00"},{"alias_kind":"arxiv_version","alias_value":"2606.26600v1","created_at":"2026-06-26T01:15:35.925285+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.26600","created_at":"2026-06-26T01:15:35.925285+00:00"},{"alias_kind":"pith_short_12","alias_value":"GULHG3BUYFIO","created_at":"2026-06-26T01:15:35.925285+00:00"},{"alias_kind":"pith_short_16","alias_value":"GULHG3BUYFIOZFRO","created_at":"2026-06-26T01:15:35.925285+00:00"},{"alias_kind":"pith_short_8","alias_value":"GULHG3BU","created_at":"2026-06-26T01:15:35.925285+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/GULHG3BUYFIOZFROPZATEBJ3R3","json":"https://pith.science/pith/GULHG3BUYFIOZFROPZATEBJ3R3.json","graph_json":"https://pith.science/api/pith-number/GULHG3BUYFIOZFROPZATEBJ3R3/graph.json","events_json":"https://pith.science/api/pith-number/GULHG3BUYFIOZFROPZATEBJ3R3/events.json","paper":"https://pith.science/paper/GULHG3BU"},"agent_actions":{"view_html":"https://pith.science/pith/GULHG3BUYFIOZFROPZATEBJ3R3","download_json":"https://pith.science/pith/GULHG3BUYFIOZFROPZATEBJ3R3.json","view_paper":"https://pith.science/paper/GULHG3BU","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2606.26600&json=true","fetch_graph":"https://pith.science/api/pith-number/GULHG3BUYFIOZFROPZATEBJ3R3/graph.json","fetch_events":"https://pith.science/api/pith-number/GULHG3BUYFIOZFROPZATEBJ3R3/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/GULHG3BUYFIOZFROPZATEBJ3R3/action/timestamp_anchor","attest_storage":"https://pith.science/pith/GULHG3BUYFIOZFROPZATEBJ3R3/action/storage_attestation","attest_author":"https://pith.science/pith/GULHG3BUYFIOZFROPZATEBJ3R3/action/author_attestation","sign_citation":"https://pith.science/pith/GULHG3BUYFIOZFROPZATEBJ3R3/action/citation_signature","submit_replication":"https://pith.science/pith/GULHG3BUYFIOZFROPZATEBJ3R3/action/replication_record"}},"created_at":"2026-06-26T01:15:35.925285+00:00","updated_at":"2026-06-26T01:15:35.925285+00:00"}