Double beta decay: present status

The present status of double beta decay experiments (including the search for $2β^{+}$, EC$β^{+}$ and ECEC processes) are reviewed. The results of the most sensitive experiments are discussed. Average and recommended half-life values for two-neutrino double beta decay are presented. Conservative upper limits on effective Majorana neutrino mass and the coupling constant of the Majoron to the neutrino are established as $<m_ν > < 0.75$ eV and $<g_{ee} > < 1.9 \cdot 10^{-4}$, respectively. Proposals for future double beta decay experiments with a sensitivity for the $<m_ν>$ at the level of (0.01-0.1) eV are considered.

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