The atmospheric neutrino flavor ratio from a 3.9 fiducial kiloton-year exposure of Soudan 2

W. W.M. Allison, G. J. Alner, D. S. Ayres, G. Barr, W. L. Barrett, C. Bode, P. M. Border, C. B. Brooks, J. H. Cobb, R. J. Cotton, H. Courant, D. M. Demuth, T. H. Fields, H. R. Gallagher, C. Garcia-Garcia, M. C. Goodman, R. Gran, T. Joffe-Minor, T. Kafka, S. M.S. KasaharaW. Leeson, P. J. Litchfield, N. P. Longley, W. A. Mann, M. L. Marshak, R. H. Milburn, W. H. Miller, L. Mualem, A. Napier, W. P. Oliver, G. F. Pearce, E. A. Peterson, D. A. Petyt, L. E. Price, K. Ruddick, M. Sanchez, J. Schneps, M. H. Schub, R. Seidlein, A. Stassinakis, J. L. Thron, V. Vassiliev, G. Villaume, S. Wakely, D. Wall, N. West, U. M. Wielgosz

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366 Scopus citations

Abstract

We report a measurement of the atmospheric neutrino flavor ratio, R, using a sample of quasi-elastic neutrino interactions occurring in an iron medium. The flavor ratio (tracks/showers) of atmospheric neutrinos in a 3.9 fiducial kiloton-year exposure of Soudan 2 is 0.64 ± 0.11(stat.) ± 0.06(syst.) of that expected. Important aspects of our main analysis have been checked by carrying out two independent, alternative analyses; one is based upon automated scanning, the other uses a multivariate approach for background subtraction. Similar results are found by all three approaches.

Original languageEnglish (US)
Pages (from-to)137-144
Number of pages8
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume449
Issue number1-2
DOIs
StatePublished - 1999

Bibliographical note

Funding Information:
This work was undertaken with the support of the U.S. Department of Energy, the State and University of Minnesota, and the U.K. Particle Physics and Astronomy Research Council. We would also like to thank: the Minnesota Department of Natural Resources for allowing us to use the facilities of the Soudan Underground Mine State Park; the staff of the Park, particularly Park Managers P. Wannarka and J. Essig, for their day to day support; and Messrs B. Anderson, J. Beaty, G. Benson, D. Carlson, J. Eininger and J. Meier of the Soudan Mine Crew for their work in the installation and running of the experiment.

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