Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 92: Neutrinophysik IV

T 92.1: Group Report

Thursday, March 22, 2018, 16:30–16:50, Z6 - SR 2.012

Results on the search for neutrinoless double beta decay from GERDA Phase II — •Anna Julia Zsigmond for the GERDA collaboration — Max-Planck-Institut für Physik

The Gerda (GErmanium Detector Array) experiment, located at the Laboratori Nazionali del Gran Sasso, is searching for the lepton number violating neutrinoless double beta (0νββ) decay of ⁷⁶Ge. Since the end of 2015, in Phase II of the experiment, 35 kg of enriched high-purity germanium detectors are operated in liquid argon (LAr), that serves as cooling medium for the detectors as well as active shield against external radiation. The aim is to reach a sensitivity on the 0νββ decay half-life larger than 10²⁶ yr. This is possible with a background level of 10⁻³ cts/(keV·kg·yr) and an exposure of about 100 kg·yr. The background level has been achieved by using the scintillation light of the LAr for background rejection and by using BEGe type detectors with superior pulse shape discrimination properties. In this talk the details of the analysis and the latest half-life limit of the 0νββ decay search will be presented.