Browsing by Author "Kornis, J"

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    Final results from the Palo Verde neutrino oscillation experiment
    (American Physical Society, 2001-11-05) Boehm, F; Busenitz, J; Cook, B; Gratta, G; Henrikson, H; Kornis, J; Lawrence, D; Lee, KB; McKinny, K; Miller, L; Novikov, V; Piepke, A; Ritchie, B; Tracy, D; Vogel, P; Wang, YF; Wolf, J; University of Alabama Tuscaloosa; Arizona State University; Arizona State University-Tempe; California Institute of Technology; Stanford University
    The analysis and results are presented from the complete data set recorded at Palo Verde bet een September 1998 and July 2000. In the experiment, the (p) over bar (e), interaction rate has been measured at a distance of 750 and 890 m from the reactors of the Palo Verde Nuclear Generating Station for a total of 350 days, including 108 days with one of the three reactors off for refueling. Backgrounds were determined by (a) the swap technique based on the difference between signal and background under reversal of the positron and neutron parts or the correlated event, and (b) making use of the conventional reactor-on and reactor-off cycles. There is no evidence for neutrino oscillation and the mode (v) over bar (e)-(v) over bar (x) was excluded at 90% C.L. for Deltam(2)>1.1x10(-3) eV(2) at full mixing. and sin(2)2 theta >0.17 at large Deltam(2).
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    Results from the Palo Verde neutrino oscillation experiment
    (American Physical Society, 2000-09-07) Boehm, F; Busenitz, J; Cook, B; Gratta, G; Henrikson, H; Kornis, J; Lawrence, D; Lee, KB; McKinny, K; Miller, L; Novikov, V; Piepke, A; Ritchie, B; Tracy, D; Vogel, P; Wang, YF; Wolf, J; California Institute of Technology; Arizona State University; Arizona State University-Tempe; University of Alabama Tuscaloosa; Stanford University
    The <(nu)over bar>(e) flux and spectrum have been measured at a distance of about 800 m from the reactors of the Pale Verde Nuclear Generating Station using a segmented Gd-loaded Liquid scintillator detector. Correlated positron-neutron events from the reaction <(nu)over bar>(e)p --> 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 ef 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. <(nu)over bar>(e) --><(nu)over bar>(x) oscillations were excluded at 90% C.L. for Delta m(2)>1.12x10(-3) eV(2) for full mixing and sin(2)2 theta>0.21 for large Delta m(2). These results support the conclusion that the observed atmospheric neutrino oscillations do not involve nu(e).