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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