First results from KamLAND: evidence for reactor antineutrino disappearance.
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.
Eguchi
K
K
Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan.
Enomoto
S
S
Furuno
K
K
Goldman
J
J
Hanada
H
H
Ikeda
H
H
Ikeda
K
K
Inoue
K
K
Ishihara
K
K
Itoh
W
W
Iwamoto
T
T
Kawaguchi
T
T
Kawashima
T
T
Kinoshita
H
H
Kishimoto
Y
Y
Koga
M
M
Koseki
Y
Y
Maeda
T
T
Mitsui
T
T
Motoki
M
M
Nakajima
K
K
Nakajima
M
M
Nakajima
T
T
Ogawa
H
H
Owada
K
K
Sakabe
T
T
Shimizu
I
I
Shirai
J
J
Suekane
F
F
Suzuki
A
A
Tada
K
K
Tajima
O
O
Takayama
T
T
Tamae
K
K
Watanabe
H
H
Busenitz
J
J
Djurcic
Z
Z
McKinny
K
K
Mei
D-M
DM
Piepke
A
A
Yakushev
E
E
Berger
B E
BE
Chan
Y D
YD
Decowski
M P
MP
Dwyer
D A
DA
Freedman
S J
SJ
Fu
Y
Y
Fujikawa
B K
BK
Heeger
K M
KM
Lesko
K T
KT
Luk
K-B
KB
Murayama
H
H
Nygren
D R
DR
Okada
C E
CE
Poon
A W P
AW
Steiner
H M
HM
Winslow
L A
LA
Horton-Smith
G A
GA
McKeown
R D
RD
Ritter
J
J
Tipton
B
B
Vogel
P
P
Lane
C E
CE
Miletic
T
T
Gorham
P W
PW
Guillian
G
G
Learned
J G
JG
Maricic
J
J
Matsuno
S
S
Pakvasa
S
S
Dazeley
S
S
Hatakeyama
S
S
Murakami
M
M
Svoboda
R C
RC
Dieterle
B D
BD
DiMauro
M
M
Detwiler
J
J
Gratta
G
G
Ishii
K
K
Tolich
N
N
Uchida
Y
Y
Batygov
M
M
Bugg
W
W
Cohn
H
H
Efremenko
Y
Y
Kamyshkov
Y
Y
Kozlov
A
A
Nakamura
Y
Y
De Braeckeleer
L
L
Gould
C R
CR
Karwowski
H J
HJ
Markoff
D M
DM
Messimore
J A
JA
Nakamura
K
K
Rohm
R M
RM
Tornow
W
W
Young
A R
AR
Wang
Y-F
YF