Volume 421 - Neutrino Oscillation Workshop (NOW2022) - Session IV. Neutrino masses, states and interactions
The GERDA enterprise in the search for matter creation
T. Comellato
Full text: pdf
Pre-published on: December 28, 2022
Published on:
Abstract
The Gerda experiment has searched for the neutrinoless double-beta decay of $^{76}$Ge from 2011 to 2019, accumulating an exposure of 127.2 kg yr. Thanks to the novel experimental concept of
operating bare germanium detectors in an instrumented liquid argon bath, it reached a background
level of $(5.2^{+1.6}_{-1.3} \cdot 10^{−4})$ cts/(keV kg yr), which is the lowest value ever achieved in a double-beta experiment. No hint for a discovery was found, and the limit on the half-life of the process was set to $T_{1/2}^{0\nu\beta\beta} > 1.8 \cdot 10^{26}$ yr at $90\%$ C.L.. In addition to this result, the Gerda collaboration has provided the most precise determination of the half-life of the standard double-beta decay of $^{76}$Ge,
which has been preliminarily set to $T_{1/2}^{2\nu\beta\beta} = (2.022 \pm 0.041) \cdot 10^{21}$ yr. The existence of beyond the Standard Model physics has also been investigated through the emission of exotic particles and no evidence for a signal was found.
DOI: https://doi.org/10.22323/1.421.0069
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