Final results from the Palo Verde neutrino oscillation experiment

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

Abstract

The analysis and results are presented from the complete data set recorded at Palo Verde between September 1998 and July 2000. In the experiment, the ν̅e 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 of 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 ν̅e→ν̅x was excluded at 90% C.L. for Δm2>1.1×10-3 eV2 at full mixing, and sin22θ>0.17 at large Δm2.

Additional Information

©2001 The American Physical Society Received 3 July 2001; published 5 November 2001 We would like to thank the Arizona Public Service Company for the generous hospitality provided at the Palo Verde plant. The important contributions of M. Chen, R. Hertenberger, K. Lou, and N. Mascarenhas in the early stages of this project are gratefully acknowledged. We are indebted to J. Ball, B. Barish, R. Canny, M. Dugger, A. Godber, J. Hanson, D. Michael, C. Peck, C. Roat, N. Tolich, A. Vital, and J. Winterton for their help. We also acknowledge the generous financial help from the University of Alabama, Arizona State University, California Institute of Technology, and Stanford University. Finally, our gratitude goes to CERN, DESY, Fermilab, LANL, LLNL, SLAC, and TJNAF, who at different times provided us with parts and equipment needed for the experiment. This project was supported in part by the Department of Energy and the National Science Foundation. One of us (J.K.) received support from the Hungarian OTKA fund, and another (L.M.) from the ARCS Foundation.

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