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Crystal Based Double beta decay Experiments

The study of neutrinoless double beta decay (DBD) is the only presently known approach to the fundamental question if the neutrino is a Majorana particle, i.e. its own anti-particle. The observation of neutrinoless DBD would not only establish the Majorana nature of the neutrino but also allow to determine its effective mass if the nuclear matrix elements are given. The status of experiments under construction or in commissioning phase using semiconductor detectors technlogies is reviewed.