First Results from KamLAND: Evidence for Reactor Antineutrino Disappearance

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17 January 2003

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 90 (2) , 021802
https://doi.org/10.1103/physrevlett.90.021802

Abstract

KamLAND has measured the flux of

{\bar{ν}}_{e}

’s from distant nuclear reactors. We find fewer

{\bar{ν}}_{e}

events than expected from standard assumptions about

{\bar{ν}}_{e}

propagation at the 99.95% C.L. In a

162 ton \cdot y r

exposure the ratio of the observed inverse

β

-decay events to the expected number without

{\bar{ν}}_{e}

disappearance is

0.611 \pm 0.085 (s t a t) \pm 0.041 (s y s t)

for

{\bar{ν}}_{e}

energies

> 3.4 M e V

. 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.

Keywords

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Version 1, 2002-12-09, ArXiv

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