| Literature DB >> 18643415 |
S Abe1, T Ebihara, S Enomoto, K Furuno, Y Gando, K Ichimura, H Ikeda, K Inoue, Y Kibe, Y Kishimoto, M Koga, A Kozlov, Y Minekawa, T Mitsui, K Nakajima, K Nakajima, K Nakamura, M Nakamura, K Owada, I Shimizu, Y Shimizu, J Shirai, F Suekane, A Suzuki, Y Takemoto, K Tamae, A Terashima, H Watanabe, E Yonezawa, S Yoshida, J Busenitz, T Classen, C Grant, G Keefer, D S Leonard, D McKee, A Piepke, M P Decowski, J A Detwiler, S J Freedman, B K Fujikawa, F Gray, E Guardincerri, L Hsu, R Kadel, C Lendvai, K-B Luk, H Murayama, T O'Donnell, H M Steiner, L A Winslow, D A Dwyer, C Jillings, C Mauger, R D McKeown, P Vogel, C Zhang, B E Berger, C E Lane, J Maricic, T Miletic, M Batygov, J G Learned, S Matsuno, S Pakvasa, J Foster, G A Horton-Smith, A Tang, S Dazeley, K E Downum, G Gratta, K Tolich, W Bugg, Y Efremenko, Y Kamyshkov, O Perevozchikov, H J Karwowski, D M Markoff, W Tornow, K M Heeger, F Piquemal, J-S Ricol.
Abstract
The KamLAND experiment has determined a precise value for the neutrino oscillation parameter Deltam21(2) and stringent constraints on theta12. The exposure to nuclear reactor antineutrinos is increased almost fourfold over previous results to 2.44 x 10(32) proton yr due to longer livetime and an enlarged fiducial volume. An undistorted reactor nu[over]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 Deltam21(2)=7.58(-0.13)(+0.14)(stat) -0.15+0.15(syst) x 10(-5) eV2 and tan2theta12=0.56(-0.07)+0.10(stat) -0.06+0.10(syst). Local Deltachi2 minima at higher and lower Deltam21(2) are disfavored at >4sigma. Combining with solar neutrino data, we obtain Deltam21(2)=7.59(-0.21)+0.21 x 10(-5) eV2 and tan2theta12=0.47(-0.05)+0.06.Entities:
Year: 2008 PMID： 18643415 DOI： 10.1103/PhysRevLett.100.221803
Source DB: PubMed Journal: Phys Rev Lett ISSN： 0031-9007 Impact factor: 9.161