XXth International Conference on Neutrino Physics and Astrophysics

Poster Abstract


Measurement of the Atmospheric Muon Neutrino Flux: MACRO Final Results

We present and discuss the results on atmospheric neutrino oscillations using the MACRO detector, which was operational at Gran Sasso from 1989 till 2000. Different event topologies were studied, with different average energy of the parent neutrino: medium (~4 GeV) and high (~50 GeV) energy. Using the Multiple Coulomb Scattering of muons inside the lower part of the detector, estimates of neutrino energies were made for the high energy sample. In our data, the angular distributions, the absolute flux and the L/E_nu distributions favor nu_mu <--> nu_tau oscillations with maximal mixing and Dm^2=2.5 x 10^-3 eV^2.

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