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Phys.:","work_id":"74956908-ed2b-4015-93b2-821c80cee2a5","year":2020},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":5,"title":"Institut für Seltene Erden, Prices for stable isotopes, Available at:https://ritverc.com/en/products/ reference-and-check-sources-and-solutions/gamma-sources/point-sources(accessed 6 Oct 2025)","work_id":"42567452-531f-448f-aa95-eda3c1ce8ed1","year":2025}],"snapshot_sha256":"adbfa7c1be4d6597b89a14dd3d1b9111b38739bc41979dbc99061bc8d27fc02a"},"source":{"id":"2605.13215","kind":"arxiv","version":1},"verdict":{"created_at":"2026-05-14T01:18:01.998441Z","id":"f237ad55-8337-4483-9f49-6e749c6900b7","model_set":{"reader":"grok-4.3"},"one_line_summary":"The first 180-gram Zr-96 sample enriched to 88.28% by gas centrifugation was produced and characterized, setting the strongest sea-level limit on its double beta decay half-life to the 1148 keV excited state of Mo-96 at >3.9e19 years.","pipeline_version":"pith-pipeline@v0.9.0","pith_extraction_headline":"Gas-centrifuge enrichment of zirconium-96 enables the strongest sea-level limit on its double beta decay half-life to an excited state of over 3.9 × 10^19 years.","strongest_claim":"The most stringent limit, obtained at sea level, on the half-life of the double beta decay of ^{96}Zr to the 0^+_1 excited state (1148 keV) of ^{96}Mo has been set T_{1/2}(0ν+2ν)>3.9 × 10^{19} yr (90% C.L.).","weakest_assumption":"The background from radionuclide impurities has been fully characterized and subtracted using the HPGe measurements, allowing the stated half-life limit to be set without unaccounted systematic effects."}},"verdict_id":"f237ad55-8337-4483-9f49-6e749c6900b7"}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:af4fe2ef0cbaba1c2d94cc6ffe08532d7e11d99aae85b9f44c3a00fac7d62cd0","target":"record","created_at":"2026-05-18T03:08:48Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"ddc9cf6e70c5d94254ca0e5f7967b9767999aecdd2ba42bcc9d62e09744f3dde","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"nucl-ex","submitted_at":"2026-05-13T09:07:14Z","title_canon_sha256":"8c9955e9f63b1648181aa0b6fac2fc6c94ffc71de7cacb75ef8ff1f865f61d5e"},"schema_version":"1.0","source":{"id":"2605.13215","kind":"arxiv","version":1}},"canonical_sha256":"05bbd5ddd831ccb51b251905bdd4aafaba96cda3e5f2b45b722b381fc46ee0ef","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"05bbd5ddd831ccb51b251905bdd4aafaba96cda3e5f2b45b722b381fc46ee0ef","first_computed_at":"2026-05-18T03:08:48.485606Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:08:48.485606Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"PhrSdmoMIqykJpyOy8t7CJtlJiYdxOWQjS4kjRk0pOBPjpy2+80Cp1miNv4M4xIl4dmb2RP1GJva9yHDHscxAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:08:48.486334Z","signed_message":"canonical_sha256_bytes"},"source_id":"2605.13215","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:af4fe2ef0cbaba1c2d94cc6ffe08532d7e11d99aae85b9f44c3a00fac7d62cd0","sha256:d2da0c4fbf85031189063357ec964d5f949cfc7440a2b09c30df485c7f2e1831"],"state_sha256":"49cffdb24c5b5f0bcd2fa5074e4718217d3e50f48bcefc88a32eae8fc2449181"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Dw5v270M1tjRyY6VgSLbRJvYandBMfgYAVJr2ai+NNdPjeAexJjXOqSeELjrJpfiaU2JlxsZ4NhcVDaQKeZrBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-20T18:39:23.862175Z","bundle_sha256":"1ec995077b034d6b273629f0070329b9bda35cd94688f0be133642d6ee7ad156"}}