Abstract
Predictions of the effective Majorana mass |⟨m⟩| in (ββ)0ν decay for 3-ν mixing and massive Majorana neutrinos are reviewed in the present study. The physics potential of the experiments, searching for (ββ)0ν decay and having sensitivity to |⟨m⟩|⪆0.01 eV for providing information on the type of the neutrino mass spectrum, the absolute scale of neutrino masses and on the Majorana CP-violation phases in the PMNS neutrino mixing matrix, is also discussed.
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