Abstract
The data taken with the ANTARES neutrino telescope from 2007 to 2010, a total live time of 863 days,
are used to measure the oscillation parameters of atmospheric neutrinos. Muon tracks are reconstructed
with energies as low as 20 GeV. Neutrino oscillations will cause a suppression of vertical upgoing
muon neutrinos of such energies crossing the Earth. The parameters determining the oscillation of
atmospheric neutrinos are extracted by fitting the event rate as a function of the ratio of the estimated
neutrino energy and reconstructed flight path through the Earth. Measurement contours of the oscillation
parameters in a two-flavour approximation are derived. Assuming maximal mixing, a mass difference of
m232= (3.1±0.9) · 10−3 eV2 is obtained, in good agreement with the world average value.