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Measurement of Neutrino Oscillation with KamLAND: Evidence of Spectral Distortion
T. Araki ,
K. Eguchi ,
S. Enomoto ,
K. Furuno ,
K. Ichimura ,
H. Ikeda ,
K. Inoue ,
K. Ishihara ,
T. Iwamoto ,
T. Kawashima ,
Y. Kishimoto ,
M. Koga ,
Y. Koseki ,
T. Maeda ,
T. Mitsui ,
M. Motoki ,
K. Nakajima ,
H. Ogawa ,
K. Owada ,
J.-S. Ricol ,
I. Shimizu ,
J. Shirai ,
F. Suekane ,
A. Suzuki ,
K. Tada ,
O. Tajima ,
K. Tamae ,
Y. Tsuda ,
H. Watanabe ,
J. Busenitz ,
T. Classen ,
Z. Djurcic ,
G. Keefer ,
K. McKinny ,
D.-M. Mei ,
A. Piepke ,
E. Yakushev ,
B. E. Berger ,
Y. D. Chan ,
M. P. Decowski ,
D. A. Dwyer ,
S. J. Freedman ,
Y. Fu ,
B. K. Fujikawa ,
J. Goldman ,
F. Gray ,
K. M. Heeger ,
K. T. Lesko ,
K.-B. Luk ,
H. Murayama ,
A. W. P. Poon ,
H. M. Steiner ,
L. A. Winslow ,
G. A. Horton-Smith ,
C. Mauger ,
R. D. McKeown ,
P. Vogel ,
C. E. Lane ,
T. Miletic ,
P. W. Gorham ,
G. Guillian ,
J. G. Learned ,
J. Maricic ,
S. Matsuno ,
S. Pakvasa ,
S. Dazeley ,
S. Hatakeyama ,
A. Rojas ,
R. Svoboda ,
B. D. Dieterle ,
J. Detwiler ,
G. Gratta ,
K. Ishii ,
N. Tolich ,
Y. Uchida ,
M. Batygov ,
W. Bugg ,
Y. Efremenko ,
Y. Kamyshkov ,
A. Kozlov ,
Y. Nakamura ,
C. R. Gould ,
H. J. Karwowski ,
D. M. Markoff ,
J. A. Messimore ,
K. Nakamura ,
R. M. Rohm ,
W. Tornow ,
R. Wendell ,
A. R. Young ,
M.-J. Chen ,
Y.-F. Wang ,
F. Piquemal
March 1 2005
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Abstract
We present results of a study of neutrino oscillation based on a 766 ton/year exposure
of KamLAND to reactor antineutrinos. We observe 258 nu (e) candidate events with energies
above 3.4 MeV compared to 365.2+/-23.7 events expected in the absence of neutrino
oscillation. Accounting for 17.8+/-7.3 expected background events, the statistical
significance for reactor nu (e) disappearance is 99.998%. The observed energy spectrum
disagrees with the expected spectral shape in the absence of neutrino oscillation
at 99.6% significance and prefers the distortion expected from nu (e) oscillation
effects. A two-neutrino oscillation analysis of the KamLAND data gives Deltam(2)=7.9(+0.6)(-0.5)x10(-5)
eV(2). A global analysis of data from KamLAND and solar-neutrino experiments yields
Deltam(2)=7.9(+0.6)(-0.5)x10(-5) eV(2) and tan((2)theta=0.40(+0.10)(-0.07), the most
precise determination to date.