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HK: Fachverband Physik der Hadronen und Kerne

HK 14: Astroparticle Physics I

HK 14.2: Vortrag

Dienstag, 28. März 2017, 11:30–11:45, F 33

Performance of Germanium detectors in gerda Phase II — •Andrea Lazzaro for the GERDA collaboration — Physik-Department and Excellence Cluster Universe, Technische Universität München, Germany

The gerda experiment searches for neutrinoless double beta decay with Ge semiconductor detectors operated in liquid Ar. The Phase II of the experiment is taking data since December 2015. The goal is to increase the sensitivity for the half–life of ⁷⁶Ge above 10²⁶ yr.

Two types of high purity Ge detectors, enriched in ⁷⁶Ge, deployed: semi–coaxial and BEGe. These detectors have excellent energy resolution and allowed pulse shape discrimination of the main background sources: multiple–site events; external α’s and β’s.

In this talk I will present the performance of the detectors during the first part of the Phase II data–taking. The stability of the spectroscopy parameters, as energy calibration and resolution, is fundamental to operate a modular system. I will also discuss the active suppression of the different background components. This work was supported by the BMBF.