First results from KamLAND

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Antineutrinos

Scientific paper

In January 22, 2002 KamLAND started the data-taking. With the data sample from March 3 through October 6, 2002, KamLAND has measured the flux of electron anti-neutrinos from distant nuclear reactors. We find fewer electron anti-neutrino events than expected from standard assumptions about the electron anti-neutrino propagation at 99.95% C.L. In a 162 ton-yr exposure the ratio of the number of observed inverse β-decay events to the expected number without electron anti-neutrino disappearance is 0.611 ± 0.085 (stat.) ± 0.041 (sys.) for electron anti-neutrino 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.

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