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arXiv · hep-ex/0003022

Results from the Palo Verde Neutrino Oscillation Experiment

F. Boehm·J. Busenitz·B. Cook·G. Gratta·H. Henrikson·J. Kornis·D. Lawrence·K. B. Lee·K. McKinny·L. Miller·V. Novikov·A. Piepke·B. Ritchie·D. Tracy·P. Vogel·Y-F. Wang·J. Wolf
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Abstract

The $\nuebar$ flux and spectrum have been measured at a distance of about 800 m from the reactors of the Palo Verde Nuclear Generating Station using a segmented Gd-loaded liquid scintillator detector. Correlated positron-neutron events from the reaction $\nuebar$p$\to$e^+n were recorded for a period of 200 d including 55 d with one of the three reactors off for refueling. Backgrounds were accounted for by making use of the reactor-on and reactor-off cycles, and also with a novel technique based on the difference between signal and background under reversal of the e^+ and n portions of the events. A detailed description of the detector calibration, background subtraction, and data analysis is presented here. Results from the experiment show no evidence for neutrino oscillations. $\nuebar\to\barν_x$ oscillations were excluded at 90% CL for $\dm>1.12\times10^{-3}$ eV^2 for full mixing, and $\sinq>0.21$ for large $\dm$. These results support the conclusion that the observed atmospheric neutrino oscillations does not involve $ν_{\rm e}$.

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F. Boehm, J. Busenitz, B. Cook, G. Gratta, H. Henrikson, J. Kornis, D. Lawrence, K. B. Lee, K. McKinny, L. Miller, V. Novikov, A. Piepke, B. Ritchie, D. Tracy, P. Vogel, Y-F. Wang, J. Wolf. 2000-03-16. Results from the Palo Verde Neutrino Oscillation Experiment. https://doi.org/10.1103/physrevd.62.072002

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