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T: Fachverband Teilchenphysik

T 32: Neutrinophysik II

T 32.4: Gruppenbericht

Dienstag, 26. März 2019, 17:00–17:20, H11

Search for neutrinoless double beta decay with GERDA: status and results — •Anna Julia Zsigmond for the GERDA collaboration — Max-Planck-Institut für Physik

The observation of neutrinoless double beta (0νββ) decay would establish both the violation of lepton number conservation and the Majorana nature of the neutrino, as well as constrain the neutrino mass hierarchy and scale. In 2018, the Gerda experiment reached an important milestone in the search for 0νββ decay with ⁷⁶Ge by achieving a half-life sensitivity of 10²⁶ years. This is made possible by the background-free conditions in Gerda and by a factor of two increase in exposure since the data release in 2017. The details of the background reduction techniques and the latest results will be presented. In 2018, the Gerda setup has been upgraded with germanium detectors of a new design and improved instrumentation of the liquid argon to veto background events. The first results on the performance of the upgraded experimental setup will be also discussed.