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Precision Measurement of Neutrino Oscillation Parameters with KamLAND

Precision Measurement of Neutrino Oscillation Parameters with KamLAND,10.1103/PhysRevLett.100.221803,Physical Review Letters,S. Abe,T. Ebihara,S. Enom

Precision Measurement of Neutrino Oscillation Parameters with KamLAND   (Citations: 36)
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S. Abe, T. Ebihara, S. Enomoto, K. Furuno, Y. Gando, K. Ichimura, H. Ikeda, K. Inoue, Y. Kibe, Y. Kishimoto, M. Koga, A. Kozlovhttp://academic.research.microsoft.com/io.ashx?type=5&id=19236560&selfId1=0&selfId2=0&maxNumber=12&query=
The KamLAND experiment has determined a precise value for the neutrino oscillation parameter Deltam212 and stringent constraints on theta12. The exposure to nuclear reactor antineutrinos is increased almost fourfold over previous results to 2.44×1032protonyr due to longer livetime and an enlarged fiducial volume. An undistorted reactor nu¯e energy spectrum is now rejected at >5sigma. Analysis of the reactor spectrum above the inverse beta decay energy threshold, and including geoneutrinos, gives a best fit at Deltam212=7.58-0.13+0.14(stat)-0.15+0.15(syst)×10-5eV2 and tanf 2theta12=0.56-0.07+0.10(stat)-0.06+0.10(syst). Local Deltachi2 minima at higher and lower Deltam212 are disfavored at >4sigma. Combining with solar neutrino data, we obtain Deltam212=7.59-0.21+0.21×10-5eV2 and tanf 2theta12=0.47-0.05+0.06.
Journal: Physical Review Letters - PHYS REV LETT , vol. 100, no. 22, 2008
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