{"work":{"id":"af0ee8aa-b966-40da-bad2-6e34ed87e114","openalex_id":null,"doi":null,"arxiv_id":"hep-ex/0212021","raw_key":null,"title":"First Results from KamLAND: Evidence for Reactor Anti-Neutrino Disappearance","authors":null,"authors_text":"K","year":2002,"venue":"hep-ex","abstract":"KamLAND has been used to measure the flux of $\\bar{\\nu}_e$'s from distant nuclear reactors. In an exposure of 162 ton$\\cdot$yr (145.1 days) the ratio of the number of observed inverse $\\beta$-decay events to the expected number of events without disappearance is $0.611\\pm 0.085 {\\rm (stat)} \\pm 0.041 {\\rm (syst)} $ for $\\bar{\\nu}_e$ energies $>$ 3.4 MeV. The deficit of events is inconsistent with the expected rate for standard $\\bar{\\nu}_e$ propagation at the 99.95% confidence level. In the context of two-flavor neutrino oscillations with CPT invariance, these results exclude all oscillation solutions but the `Large Mixing Angle' solution to the solar neutrino problem using reactor $\\bar{\\nu}_e$ sources.","external_url":"https://arxiv.org/abs/hep-ex/0212021","cited_by_count":null,"metadata_source":"pith","metadata_fetched_at":"2026-07-02T02:46:27.457152+00:00","pith_arxiv_id":"hep-ex/0212021","created_at":"2026-05-10T22:45:50.537682+00:00","updated_at":"2026-07-02T02:46:27.457152+00:00","title_quality_ok":true,"display_title":"First Results from KamLAND: Evidence for Reactor Anti-Neutrino Disappearance","render_title":"First Results from KamLAND: Evidence for Reactor Anti-Neutrino Disappearance"},"hub":{"state":{"work_id":"af0ee8aa-b966-40da-bad2-6e34ed87e114","tier":"hub","tier_reason":"10+ Pith inbound or 1,000+ external citations","pith_inbound_count":14,"external_cited_by_count":null,"distinct_field_count":5,"first_pith_cited_at":"2020-06-19T17:21:48+00:00","last_pith_cited_at":"2026-07-01T16:10:13+00:00","author_build_status":"not_needed","summary_status":"needed","contexts_status":"needed","graph_status":"needed","ask_index_status":"not_needed","reader_status":"not_needed","recognition_status":"not_needed","updated_at":"2026-07-06T17:19:37.490215+00:00","tier_text":"hub"},"tier":"hub","role_counts":[{"context_role":"background","n":6}],"polarity_counts":[{"context_polarity":"background","n":6}],"runs":{},"summary":{},"graph":{},"authors":[]}}