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We report the first detailed comparisons of the rates and spectra of neutral-current neutrino interactions at two widely separated locations. A depletion in the rate at the far site would indicate mixing between vµ and a sterile particle. No anomalous depletion in the reconstructed energy spectrum is observed. Assuming oscillations occur at a single mass-squared splitting, a fit to the neutral- and charged-current energy spectra limits the fraction of vµ oscillating to a sterile neutrino to be below 0.68 at 90% confidence level. A less stringent limit due to a possible contribution to the measured neutral-current event rate at the far site from ve appearance at the current experimental limit is also presented.
|Additional Information:||© 2008 The American Physical Society. Received 16 July 2008; published 26 November 2008. This work was supported by the U.S. DOE, the U.K. PACS: 14.60.St; 12.15.Mm; 14.60.Pq STFC, the U.S. NSF, the State and University of Minnesota, the University of Athens, Greece, and Brazil’s FAPESP and CNPq. We thank S. Parke for useful discussions. We are grateful to the Minnesota Department of Natural Resources, the crew of the Soudan Underground Laboratory, and the staff of Fermilab for their contribution to this effort.|
|Subject Keywords:||PACS: 14.60.St; 12.15.Mm; 14.60.Pq|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||01 Sep 2009 22:17|
|Last Modified:||26 Dec 2012 11:07|
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