{"paper":{"title":"First observation of single beta decay of $^{96}$Zr","license":"http://creativecommons.org/licenses/by/4.0/","headline":"The single beta decay half-life of zirconium-96 is measured for the first time at 2.27 × 10^20 years.","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A. Lubashevskiy, A. M. Gangapshev, A. S. Barabash, D. Filosofov, D. V. Ponomarev, E. A. Yakushev, N. Gorshkov, N. Temerbulatova, S. Evseev, S. Kazartsev, S. Rozov, S. Vasilyev, T. Khussainov, V. I. Yumatov, V. V. Kazalov, V. V. Kuzminov, Yu. M. Gavrilyuk","submitted_at":"2026-05-18T12:57:01Z","abstract_excerpt":"The single beta decay of $^{96}$Zr has been detected for the first time using a 211 cm$^3$ low-background HPGe detector and an external source consisting of two samples of enriched zirconium (atomic fraction of $^{96}$Zr is 88.28%, total mass is 140.65 g). During the search for the $\\beta$ decay of $^{96}$Zr, the $\\beta$ decay of the daughter nucleus $^{96}$Nb to the excited states of $^{96}$Mo has been observed. The $\\gamma$-ray cascade produced by the $^{96}$Mo nucleus while de-exciting to the ground state has been detected with the HPGe detector. The experiment has been carried out at the B"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"The half-life of the single beta decay of 96Zr is measured to be T_{1/2} = [2.27^{+0.53}_{-0.36}(stat) ± 0.27(syst)]×10^{20} yr.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The detected gamma-ray cascade originates specifically from the beta decay of 96Zr to 96Nb followed by 96Nb decay to excited states of 96Mo, rather than from unrelated background processes or other isotopes.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"First observation and half-life measurement of single beta decay in 96Zr at T1/2 ≈ 2.27 × 10^20 years via gamma-ray cascade from daughter 96Nb.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"The single beta decay half-life of zirconium-96 is measured for the first time at 2.27 × 10^20 years.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"a19bea97951011e75849cb6715df20f0e26ec8176f7348d051478ed08681280b"},"source":{"id":"2605.18344","kind":"arxiv","version":1},"verdict":{"id":"d1b3c755-706b-4828-a397-07e8f433f544","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-19T23:44:46.154671Z","strongest_claim":"The half-life of the single beta decay of 96Zr is measured to be T_{1/2} = [2.27^{+0.53}_{-0.36}(stat) ± 0.27(syst)]×10^{20} yr.","one_line_summary":"First observation and half-life measurement of single beta decay in 96Zr at T1/2 ≈ 2.27 × 10^20 years via gamma-ray cascade from daughter 96Nb.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The detected gamma-ray cascade originates specifically from the beta decay of 96Zr to 96Nb followed by 96Nb decay to excited states of 96Mo, rather than from unrelated background processes or other isotopes.","pith_extraction_headline":"The single beta decay half-life of zirconium-96 is measured for the first time at 2.27 × 10^20 years."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2605.18344/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"doi_title_agreement","ran_at":"2026-05-20T00:01:20.410127Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"doi_compliance","ran_at":"2026-05-19T23:52:30.655664Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"ai_meta_artifact","ran_at":"2026-05-19T23:33:35.159935Z","status":"skipped","version":"1.0.0","findings_count":0},{"name":"external_links","ran_at":"2026-05-19T23:32:01.258295Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"claim_evidence","ran_at":"2026-05-19T23:21:58.822766Z","status":"completed","version":"1.0.0","findings_count":0}],"snapshot_sha256":"813900e8bfe80100ea4d4b1fff67e80769420d81a4a82fb9554f32b443037504"},"references":{"count":29,"sample":[{"doi":"","year":2026,"title":"First observation of single beta decay of $^{96}$Zr","work_id":"b9c1bc1a-410e-4443-8044-ef0b41e52f40","ref_index":1,"cited_arxiv_id":"2605.18344","is_internal_anchor":true},{"doi":"","year":2023,"title":"Agostini et al., Toward the discovery of matter cre- ation with neutrinoless double-beta decay, Rev","work_id":"ac324b61-3e00-4d19-9287-0c0c78dcad00","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2023,"title":"J.J. Gomez-Cadenas, J. Martin-Albo, J. Menendez, M. Mezzetto, F. Monrabal, and M. Sorel, The search for neutrinoless doublebeta decay, Riv. Nuovo Cim.46, 619 (2023)","work_id":"05dc02b6-7b2f-4dbf-8bf0-e05ccca9d8ce","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":null,"title":"Adams et al., Neutrinoless double beta decay, arXiv:2212.11099","work_id":"9ee77cd0-2beb-43f5-9ae9-d2afeccf50f3","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2021,"title":"Simkovic, Neutrino masses and interactions and neu- trino experiments in the laboratory, Phisics-Uspekhi,64, 1238-1260 (2021)","work_id":"c25bcde3-2174-49d3-aa8c-d7a77b1803ca","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":29,"snapshot_sha256":"517b274068a179ef1d4d7d38ab84642768ee21f7319d01e5b341e8542e30a7aa","internal_anchors":2},"formal_canon":{"evidence_count":1,"snapshot_sha256":"dfdfb6824dd52e33507d83ba54d232f3f33a17fb97cfab45533e7863f20c97ba"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}