The experiment GALLEX has been one of the fundamental experiments for the measure of solar neutrino flux. Operating from 1991 to 1997, has proved that solar neutrinos detected were about 55% over the value predicted by solar models. This discrepancy, known as “solar neutrinos problem”, entails the existence of the phenomenon of oscillations which allow neutrinos, emitted from the Sun as electron neutrinos, to change their flavor during the trip Sun-Earth. The experiment GNO (Gallium Neutrino Observatory) has been the successor of Gallex. The detector has been taking data from 1998 to 2002, monitoring the neutrino fluxes from the Sun.
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