Status and prospects of searches for neutrinoless double beta decay

Abstract

The simultaneous beta decay of two neutrons in a nucleus without the emission of neutrinos (called neutrinoless double beta decay) is a lepton number violating process which is not allowed in the Standard Model of particle physics. More than a dozen experiments using different candidate isotopes and a variety of detection techniques are searching for this decay. Some (EXO-200, Kamland-Zen, GERDA) started to take data recently. EXO and Kamland-Zen have reported first limits of the half life $T_{1/2}^{0\nu }$ for ${}^{136}$Xe. After a decade of little progress in this field, many new results will soon scrutinize the claim from part of the Heidelberg-Moscow collaboration to have observed this decay. The sensitivities of the different proposals are reviewed.

15 pages, 3 figures, submitted to Annalen der Physik (Berlin)

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