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The number of electron-like single-prong events is in good agreement with the predictions of a Monte Carlo calculation based on atmospheric neutrino interactions in the detector. On the other hand, the number of muon-like single-prong events is 59±7% (statistical error) of the predicted number of the Monte Carlo calculation. We are unable to explain the data as the result of systematic detector effects or uncertainties in the atmospheric neutrino fluxes."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380288248056305536","@type":"Researcher","foaf:name":[{"@value":"K.S. Hirata"}]},{"@id":"https://cir.nii.ac.jp/crid/1381981468685798153","@type":"Researcher","foaf:name":[{"@value":"T. Kajita"}]},{"@id":"https://cir.nii.ac.jp/crid/1381981468685798275","@type":"Researcher","foaf:name":[{"@value":"M. Koshiba"}]},{"@id":"https://cir.nii.ac.jp/crid/1381981468685798150","@type":"Researcher","foaf:name":[{"@value":"M. 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