{"paper":{"title":"Precision Measurement of Neutrino Oscillation Parameters with KamLAND","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-ex","physics.geo-ph"],"primary_cat":"hep-ex","authors_text":"The KamLAND Collaboration","submitted_at":"2008-01-30T00:20:46Z","abstract_excerpt":"The KamLAND experiment has determined a precise value for the neutrino oscillation parameter $\\Delta m^{2}_{21}$ and stringent constraints on $\\theta_{12}$. The exposure to nuclear reactor anti-neutrinos is increased almost fourfold over previous results to 2.44$\\times10^{32}$ proton-yr due to longer livetime and an enlarged fiducial volume. An undistorted reactor $\\bar{\\nu}_{e}$ energy spectrum is now rejected at >5$\\sigma$. Extending the analysis down to the inverse beta decay energy threshold, and incorporating geo-neutrinos, gives a best-fit at $\\Delta m^{2}_{21}$= $7.58^{+0.14}_{-0.13}(st"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0801.4589","kind":"arxiv","version":3},"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"}