Low energy atmospheric muon neutrinos in MACRO
M. Spurio
Abstract
The flux of low energy neutrinos (<Enu>~ 4 GeV) has been studied with the MACRO detector at Gran Sasso via the detection of muon neutrinos interactions inside the apparatus, and of upward-going stopping muons. Data collected in ~3 y with the full apparatus were analyzed. The results are compatible with a deficit of the flux of atmospheric muon neutrinos from below, and no reduction from above, with respect to Monte Carlo predictions. The deficit and the angular distributions are interpreted in terms of neutrino oscillations, and compared with the MACRO results on the upward throughgoing muons (<Enu>~ 100 GeV).
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