First Results from KamLAND: Evidence for Reactor Antineutrino Disappearance

K. Eguchi et al. (KamLAND Collaboration)
Phys. Rev. Lett. 90, 021802 – Published 17 January 2003

Abstract

KamLAND has measured the flux of ν¯e’s from distant nuclear reactors. We find fewer ν¯e events than expected from standard assumptions about ν¯e propagation at the 99.95% C.L. In a 162   ton·yr exposure the ratio of the observed inverse β-decay events to the expected number without ν¯e disappearance is 0.611±0.085(stat)±0.041(syst) for ν¯e energies >3.4MeV. 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.

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  • Received 6 December 2002

DOI:https://doi.org/10.1103/PhysRevLett.90.021802

©2003 American Physical Society

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Vol. 90, Iss. 2 — 17 January 2003

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