Hamburg 2016 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 36: Neutrinoloser Doppelbeta-Zerfall II
T 36.1: Gruppenbericht
Montag, 29. Februar 2016, 16:45–17:05, VMP9 SR 07
Status of Gerda Phase II — •Victoria Wagner for the GERDA collaboration — Max-Planck-Institut für Kernphysik, Heidelberg, Germany
The GERDA experiment is designed to search for neutrinoless double beta (0νββ) decay of 76Ge. In Phase I of the experiment a background index (BI) of 10−2 cts/(keV·kg·yr) was reached. No signal has been found and a lower limit on the half-life of 2.1·1025 yr (at 90% C.L.) is extracted. The aim of Phase II is to double the Ge mass and further reduce the BI by an order of magnitude to explore half-lives of about 1026 yr. Thirty new Broad Energy Germanium (BEGe) detectors have been produced. These detectors are distinct for their improved energy resolution and enhanced pulse shape discrimination of signal from background events. Further background reduction will be reached by an active veto to read out argon scintillation light. The Phase II commissioning showed that two of the major background components, external γ-rays from 214Bi and 208Tl decays, can be suppressed up to two orders of magnitude. This talk will present the current status of the GERDA Phase II upgrade.