Measurement of atmospheric neutrino composition with the IMB-3 detector

D. Casper(University of California, Irvine), R. Becker-Szendy, C. B. Bratton, D. R. Cady(Boston University), R. Claus, S. Dye(University of Warsaw), W. Gajewski(Cleveland State University), M. Goldhaber(University of Notre Dame), T. J. Haines, P. G. Halverson(University of Maryland, College Park), T. W. Jones, D. Kiełczewska, W. R. Kropp, J. G. Learned, J. M. LoSecco, C. McGrew, S. Matsuno, J. Matthews, M. Mudan, L. R. Price, F. Reines, J. Schultz, D. Sinclair, H. W. Sobel, J. L. Stone, Lawrence Sulak, R. Svoboda, G. Thornton, J. C. van der Velde
Physical Review Letters
May 20, 1991
10.1103/physrevlett.66.2561
Cited by 437

Abstract

The atmospheric neutrino flux is measured using a 3.4-kt yr exposure of the IMB-3 detector. Single-ring events are classified as showering or nonshowering using the geometry of the \ifmmode \check{C}\else \v{C}\fi{}erenkov pattern. A simulation of neutrino interactions and three models of atmospheric neutrino production are used to predict the composition of the sample. Showering-nonshowering character is strongly correlated with the flavor of the neutrino parent. In the lepton momentum range p1500 MeV/c, we find that nonshowering events comprise [41\ifmmode\pm\else\textpm\fi{}3\ifmmode\pm\else\textpm\fi{}2syst]% of the total. The fraction expected is [51\ifmmode\pm\else\textpm\fi{}5(syst)]%.

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