TL;DR
The KamLAND experiment provided strong evidence supporting the LMA solution to the solar neutrino problem by observing reactor neutrino disappearance, excluding other oscillation hypotheses with high confidence.
Contribution
This paper reports the first experimental evidence for reactor neutrino disappearance consistent with the LMA solution, using a large liquid scintillator detector at 180 km from reactors.
Findings
Evidence for reactor neutrino disappearance at 162 ton-year exposure
Excludes alternative neutrino oscillation solutions at 99.95% confidence level
Supports the LMA solution as the correct explanation for solar neutrino deficit
Abstract
The LMA solution of the solar neutrino problem has been explored with the 1,000 ton liquid scinatillator detector, KamLAND. It utilizes nuclear power reactors distributing effectively 180km from the experimental site. Comparing observed neutrino rate with the calculation of reactor operation histories, an evidence for reactor neutrino disapearance has been obtained from 162 ton-year exposure data. This deficit is only compatible with the LMA solution and the other solutions in the two neutrino oscillation hypotheisis are excluded at 99.95% confidence level.
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