论文信息 - Precision measurement of neutrino oscillation parameters with KamLAND. - 字舞流文

Precision measurement of neutrino oscillation parameters with KamLAND.

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.

M. Decowski | H. Murayama | K. Nakamura | H. Steiner | A. Terashima | Y. Minekawa | A. Piepke | P. Vogel | G. Gratta | J. Busenitz | L. Winslow | E. Guardincerri | F. Gray | Y. Kamyshkov | S. Freedman | D. Dwyer | J. Foster | K. Heeger | T. Classen | S. Dazeley | Y. Efremenko | G. Horton-Smith | G. Keefer | Y. Kibe | C. Lane | D. Mckee | J. Maricic | T. Miletić | K. Nakajima | F. Suekane | H. Watanabe | C. Zhang | C. Jillings | B. Berger | K. Luk | R. McKeown | S. Enomoto | B. Fujikawa | C. Grant | R. Kadel | J. Learned | C. Mauger | S. Pakvasa | D. Leonard | M. Nakamura | O. Perevozchikov | S. Matsuno | W. Bugg | W. Tornow | S. Abe | T. Ebihara | K. Furuno | Y. Gando | K. Ichimura | H. Ikeda | K. Inoue | Y. Kishimoto | M. Koga | A. Kozlov | T. Mitsui | K. Owada | I. Shimizu | Y. Shimizu | J. Shirai | A. Suzuki | Y. Takemoto | K. Tamae | E. Yonezawa | S. Yoshida | J. Detwiler | L. Hsu | C. Lendvai | T. O'donnell | M. Batygov | A. Tang | K. Downum | K. Tolich | H. Karwowski | D. Markoff | F. Piquemal | J. Ricol | Y. Shimizu | Y. Efremenko | K. Inoue | Y. Kamyshkov | R. Mckeown | H. Watanabe | S. Pakvasa | L. Hsu | T. O’Donnell | K. Nakamura | C. Zhang

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