{"paper":{"title":"First Results from KamLAND: Evidence for Reactor Anti-Neutrino Disappearance","license":"","headline":"","cross_cats":["nucl-ex"],"primary_cat":"hep-ex","authors_text":"KamLAND Collaboration","submitted_at":"2002-12-09T21:34:17Z","abstract_excerpt":"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 s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ex/0212021","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":""},"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"}