Volume 414 - 41st International Conference on High Energy physics (ICHEP2022) - Neutrino Physics
Final results from GERDA: a neutrinoless double beta decay search
L. Shtembari
Full text: pdf
Pre-published on: December 09, 2022
Published on:
Abstract
The GERmanium Detector Array (GERDA) experiment searched for the lepton-number-violating neutrinoless double-$\beta$ decay of $^{76}\mathrm{Ge}$. Observing such a decay would allow to shed light onto the nature of neutrinos and its discovery would have far-reaching implications in cosmology and particle physics.
By operating an array of high purity bare germanium detectors, enriched in $^{76}\mathrm{Ge}$, in an active liquid argon shield aided by pulse shape discrimination of germanium detector signals, GERDA achieved an unprecedentedly low background index of $5.2 \times 10^{-4}$ $\mathrm{counts}/(\mathrm{keV} \cdot \mathrm{kg} \cdot \mathrm{yr})$ in the signal region and was able to surpass the design goal of collecting an exposure of $100$ $\mathrm{kg} \cdot \mathrm{yr}$ in a background-free regime.
With a total exposure of $127.2$ $\mathrm{kg} \cdot \mathrm{yr}$ combining Phase I and Phase II, no signal was observed and a lower limit on the half-life of the neutrinoless double-$\beta$ decay in $^{76}\mathrm{Ge}$ is set at $T_{1/2} > 1.8 \cdot 10^{26}$ $\mathrm{yr}$ at 90% C.L., which coincides with the sensitivity assuming no signal.
DOI: https://doi.org/10.22323/1.414.0614
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access