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The neutrinos are 3 of the 12 fundamental particles out of which the matter is made of. Their mass is one of the burning questions of particle physics and cosmology.

Up to recently neutrinos were assumed to be massless, but the actual measurements of neutrinos from the sun and of neutrinos created in the atmosphere by cosmic rays indicate that they have some probably very small mass.

The Mainz Neutrino Mass Experiment measures the shape of the beta decay spectrum of tritium very precisely. This method is presently the most sensitive direct one in search for the neutrino mass.




Summer 2001, preparing run Q11: