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 {C} {C}{}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±{}3±{}2syst]% of the total. The fraction expected is [51±{}5(syst)]%.
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Casper et al. (1991) studied this question.
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