Browsing by Author "Busenitz, J"
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Item 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 UniversityThe 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).Item Measurement of neutrino oscillation with KamLAND: Evidence of spectral distortion(American Physical Society, 2005-03-01) Araki, T; Eguchi, K; Enomoto, S; Furuno, K; Ichimura, K; Ikeda, H; Inoue, K; Ishihara, K; Iwamoto, T; Kawashima, T; Kishimoto, Y; Koga, M; Koseki, Y; Maeda, T; Mitsui, T; Motoki, M; Nakajima, K; Ogawa, H; Owada, K; Ricol, JS; Shimizu, I; Shirai, J; Suekane, F; Suzuki, A; Tada, K; Tajima, O; Tamae, K; Tsuda, Y; Watanabe, H; Busenitz, J; Classen, T; Djurcic, Z; Keefer, G; McKinny, K; Mei, DM; Piepke, A; Yakushev, E; Berger, BE; Chan, YD; Decowski, MP; Dwyer, DA; Freedman, SJ; Fu, Y; Fujikawa, BK; Goldman, J; Gray, F; Heeger, KM; Lesko, KT; Luk, KB; Murayama, H; Poon, AWP; Steiner, HM; Winslow, LA; Horton-Smith, GA; Mauger, C; McKeown, RD; Vogel, P; Lane, CE; Miletic, T; Gorham, PW; Guillian, G; Learned, JG; Maricic, J; Matsuno, S; Pakvasa, S; Dazeley, S; Hatakeyama, S; Rojas, A; Svoboda, R; Dieterle, BD; Detwiler, J; Gratta, G; Ishii, K; Tolich, N; Uchida, Y; Batygov, M; Bugg, W; Efremenko, Y; Kamyshkov, Y; Kozlov, A; Nakamura, Y; Gould, CR; Karwowski, HJ; Markoff, DM; Messimore, JA; Nakamura, K; Rohm, RM; Tornow, W; Wendell, R; Young, AR; Chen, MJ; Wang, YF; Piquemal, F; Tohoku University; University of Alabama Tuscaloosa; University of California System; University of California Berkeley; United States Department of Energy (DOE); Lawrence Berkeley National Laboratory; California Institute of Technology; Drexel University; University of Hawaii System; University of Hawaii Manoa; Louisiana State University System; Louisiana State University; University of New Mexico; Stanford University; University of Tennessee System; University of Tennessee Knoxville; University of North Carolina; University of North Carolina Chapel Hill; Duke University; North Carolina State University; Chinese Academy of Sciences; Institute of High Energy Physics, CAS; UDICE-French Research Universities; Universite de Bordeaux; Centre National de la Recherche Scientifique (CNRS); CNRS - National Institute of Nuclear and Particle Physics (IN2P3)We present results of a study of neutrino oscillation based on a 766 ton/year exposure of KamLAND to reactor antineutrinos. We observe 258 (nu) over bar (e) candidate events with energies above 3.4 MeV compared to 365.2+/-23.7 events expected in the absence of neutrino oscillation. Accounting for 17.8+/-7.3 expected background events, the statistical significance for reactor (nu) over bar (e) disappearance is 99.998%. The observed energy spectrum disagrees with the expected spectral shape in the absence of neutrino oscillation at 99.6% significance and prefers the distortion expected from (nu) over bar (e) oscillation effects. A two-neutrino oscillation analysis of the KamLAND data gives Deltam(2)=7.9(-0.5)(+0.6)x10(-5) eV(2). A global analysis of data from KamLAND and solar-neutrino experiments yields Deltam(2)=7.9(-0.5)(+0.6)x10(-5) eV(2) and tan(2)theta=0.40(-0.07)(+0.10), the most precise determination to date.Item 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 UniversityThe <(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).