Abstract

The flux of muon neutrinos in the 1 – 1000 GeV range has been measured with the MACRO underground detector. The measurement has been performed by means of the time-of-flight method to separate upward-going muons coming from neutrino interactions in the surrounding rock from downward-going muons coming directly from cosmic ray cascades. The analysis results for data collected since March 1989 up to November 1996 are summarized. The zenith angular dependence of the measured upward-going muon flux is compared with the expected one assuming the Bartol atmospheric neutrino flux. Also upward-going muons generated inside the detector have been detected.

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