Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2000-03-16
Phys.Rev. D62 (2000) 072002
Physics
High Energy Physics
High Energy Physics - Experiment
19 pages, 24 figures, 7 tables
Scientific paper
10.1103/PhysRevD.62.072002
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. $\nuebar\to\bar\nu_x$ 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 $\nu_{\rm e}$.
Boehm Felix
Busenitz Jerome
Cook Brian
Gratta Giorgio
Henrikson H.
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