Hunting for cosmic neutrinos under the deep sea: the ANTARES experiment

Attempts to detect high energy neutrinos originating in violent Galactic or Extragalactic processes have been carried out for many years, both using the polar-cap ice and the sea as a target/detection medium. The first large detector built and operated for several years has been the AMANDA Ĉerenkov array, installed under about two km of ice at the South Pole. More recently a much larger detector, ICECUBE has been successfully installed and operated at the same location. Attempts by several groups to install similar arrays under large sea depths have been carried out following the original pioneering attempts by the DUMAND collaboration, initiated in 1990 and terminated only six years later. ANTARES has been so far the only detector deployed at large sea depths and successfully operated for several years. It has been installed in the Mediterranean by a large international collaboration and is in operation since 2007. I describe in the following the experimental technique, the sensitivity of the experiment, the detector performance and the first results that have been obtained in the search for neutrinos from cosmic point sources and on the oscillations of atmospheric neutrinos.