A deficit of atmospheric ν_μ events, consistent with the hypothesis of neutrino oscillations, is observed in the 5.90 kiloton-year fiducial exposure of the Soudan 2 detector. An unbinned maximum likelihood analysis of the neutrino $L/E$ distribution has been carried out using the Feldman-Cousins prescription. The probability of the no oscillation hypothesis is 5.8×10^-4. The 90% confidence allowed region in the sin²2θ,Δm² plane is presented. The region includes the 90% confidence allowed region of the Super-K experiment.
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Sánchez et al. (2003) studied this question.