Evidence for Reactor Anti-Neutrino Disappearance at KamLAND

Details Evidence for Reactor Anti-Neutrino Disappearance at KamLAND Evidence for Reactor Anti-Neutrino Disappearance at KamLAND

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003head....7.4701g&link_type=abstract

American Astronomical Society, HEAD meeting #7, #47.01; Bulletin of the American Astronomical Society, Vol. 35, p.658

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Scientific paper

KamLAND, the first terrestrial experiment with direct sensitivity to the Large Mixing Angle (LMA) solution to the solar neutrino problem, has measured the flux of electron anti-neutrinos produced by distant (flux-weighted baseline of approximately 180 km) nuclear reactors. Fewer electron anti-neutrino events are observed in this measurement than are predicted by the Standard Solar Model and the non-oscillation hypothesis at the 99.95% C.L. Using data corresponding to a period of 162 ton-years, KamLAND has found the ratio of the measured number of anti-neutrino events to the expected number of anti-neutrino events to be equal to 0.611+/-0.085(stat)+/-0.041(syst) for anti-neutrino energies greater than 3.4 MeV. With the assumption of CPT invariance and a two-flavor oscillation formalism, this measurement excludes all solutions to the solar neutrino problem other than LMA.

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