Searching for the CP - Violation Associated with Majorana Neutrinos

The effective Majorana mass which determines the rate of the neutrinoless double beta ((ββ) 0ν-)decay, |< m >| , is considered in the case of three-neutrino mixing and massive Majo-rana neutrinos. Assuming a rather precise determination of the parameters characterizing the neutrino oscillation solutions of the solar and atmospheric neutrino problems has been made, we discuss the information a measurement of |< m >| ∼ > (0.005−0.010) eV can provide on the value of the lightest neutrino mass and on the CP-violation in the lepton sector. The implications of combining a measurement of |< m >| with future measurement of the neutrino mass m νe in 3 H β−decay experiments for the possible determination of leptonic CP-violation are emphasized.