First solar neutrinos from KamLAND: A measurement of the beryllium-8 solar neutrino flux.

摘要

The result of this work is a measurement of the 8 B solar neutrino flux using neutrino-electron elastic scattering in KamLAND with a 5 MeV threshold. KamLAND is a 1 kilo-ton liquid scintillating detector located in Kamioka, Japan. The total 118 kt-day exposure results in a flux of 1.87±0.24(stat.)±0.32(syst.) × 10 6 cm-2s-1. The uncertainty in the measurement is dominated by the statistics of the candidate sample and the uncertainty in 11Be production from muon spallation. This result is consistent with previous measurements and predictions from the Standards Solar Model with matter enhanced neutrino oscillation.