Abstract
The double beta (β β) decay is considered at present as one of the most sensitive processes to test physics beyond the Standard Model. The study of this process may provide us with informations on a number of important issues as: i) lepton number non-conservation; ii) nature of the neutrino; iii) neutrino mass (if neutrino is a Majorana particle); iv) the existence of right-handed currents in the weak interaction; v) the spontaneous breaking of a global B-L symmetry; vi) check of some hypothesis related to the left-right symmetric and supersymmetric theories. This is why there is a growing interest for the β β decay study both theoretically and experimentally.
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