Search for 0$\nu \beta \beta$-decay with GERDA phase II

Majorovits, B.

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Search for 0$\nu \beta \beta$-decay with GERDA phase II

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Majorovits, B.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Majorovits, B. (2018). Search for 0$\nu \beta \beta$-decay with GERDA phase II. American Institute of Physics Conference Proceedings, (1921), 060004.

Cite as: https://hdl.handle.net/21.11116/0000-0003-F83F-0

Abstract

The Gerda experiment is designed to search for neutrinoless double beta decay of 76Ge. From data taken during Phase I of the experiment some knowledge on background contributions important for future experiments could be obtained: limits on the bulk contamination of HPGe with primordial uranium and thorium are presented and first evidence for observation of the decay of the meta-stable state of 77mGe due to neutron capture on 76Ge is discussed. In Phase II of the Gerda experiment 37 HPGe detectors enriched in the isotope 76Ge are deployed into the Gerda cryostat. From non-observation of a peak at 2039 keV a half-life limit on neutrinoless double beta decay of 76Ge of T1/2 > 5.3 · 1025 yr has been obtained. The background rate in the energy region of interest, after pulse shape discrimination and liquid argon veto cuts is in the range of a few Cts//ROI ton yr). This makes Gerda the first 0νββ-experiment that has a background so low that <1 counts are expected in the RoI within the anticipated life time of the experiment.