Double beta decay: present status

Abstract

The present status of double beta decay experiments (including the search for $2{\beta }^{+}$, EC${\beta }^{+}$ 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 $<m_{\nu }><0.75$ eV and $<g_{ee}><1.9\cdot 10^{-4}$, respectively. Proposals for future double beta decay experiments with a sensitivity for the $<m_{\nu }>$ at the level of (0.01-0.1) eV are considered.

33 pages included 7 figures and 14 tables; an extended version of the invited talk at 13th Lomonosov Conference of Elementary Particle Physics, 23-29 August, 2007, Moscow, Russia

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• Investigation of double beta decay with the NEMO-3 detector
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• First Direct Double-Beta Decay Q-value Measurement of 82Se in Support of Understanding the Nature of the Neutrino
• Low background detector with enriched 116CdWO4 crystal scintillators to search for double beta decay of 116Cd
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• Double Beta Decay to the Excited States: Review
• Search for 2β decay of 116Cd with the help of enriched 116CdWO4 crystal scintillators
• Improved limits on ${\beta }^{+}$EC and ECEC processes in ${}^{74}$Se
• Comprehensive Review of 2$\beta$ Decay Half-Lives
• An assembly line for the construction of ultra-pure detectors
• A Segmented, Enriched N-type Germanium Detector for Neutrinoless Double Beta-Decay Experiments