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First Results from KamLAND: Evidence for Reactor Antineutrino Disappearance
K. Eguchi ,
S. Enomoto ,
K. Furuno ,
J. Goldman ,
H. Hanada ,
H. Ikeda ,
K. Ikeda ,
K. Inoue ,
K. Ishihara ,
W. Itoh ,
T. Iwamoto ,
T. Kawaguchi ,
T. Kawashima ,
H. Kinoshita ,
Y. Kishimoto ,
M. Koga ,
Y. Koseki ,
T. Maeda ,
T. Mitsui ,
M. Motoki ,
K. Nakajima ,
M. Nakajima ,
T. Nakajima ,
H. Ogawa ,
K. Owada ,
T. Sakabe ,
I. Shimizu ,
J. Shirai ,
F. Suekane ,
A. Suzuki ,
K. Tada ,
O. Tajima ,
T. Takayama ,
K. Tamae ,
H. Watanabe ,
J. Busenitz ,
Z. Djurcic ,
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 ,
K. M. Heeger ,
K. T. Lesko ,
K.-B. Luk ,
H. Murayama ,
D. R. Nygren ,
C. E. Okada ,
A. W. P. Poon ,
H. M. Steiner ,
L. A. Winslow ,
G. A. Horton-Smith ,
R. D. McKeown ,
J. Ritter ,
B. Tipton ,
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 ,
M. Murakami ,
R. C. Svoboda ,
B. D. Dieterle ,
M. DiMauro ,
J. Detwiler ,
G. Gratta ,
K. Ishii ,
N. Tolich ,
Y. Uchida ,
M. Batygov ,
W. Bugg ,
H. Cohn ,
Y. Efremenko ,
Y. Kamyshkov ,
A. Kozlov ,
Y. Nakamura ,
L. De Braeckeleer ,
C. R. Gould ,
H. J. Karwowski ,
D. M. Markoff ,
J. A. Messimore ,
K. Nakamura ,
R. M. Rohm ,
W. Tornow ,
A. R. Young ,
Y.-F. Wang
January 17 2003
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Abstract
KamLAND has measured the flux of nu;(e)'s from distant nuclear reactors. We find fewer
nu;(e) events than expected from standard assumptions about nu;(e) propagation at
the 99.95% C.L. In a 162 ton.yr exposure the ratio of the observed inverse beta-decay
events to the expected number without nu;(e) disappearance is 0.611+/-0.085(stat)+/-0.041(syst)
for nu;(e) energies >3.4 MeV. In the context of two-flavor neutrino oscillations with
CPT invariance, all solutions to the solar neutrino problem except for the "large
mixing angle" region are excluded.