Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 12: Astroteilchenphysik: Methoden I

T 12.1: Talk

Monday, March 25, 2019, 16:00–16:15, S12

Surface scans of inverted coaxial HPGe detctors for the LEGEND collaboration — •Andreas Zschocke for the LEGEND collaboration — Physikalisches Institut, Universität Tübingen

The LEGEND collaboration plans to search for the neutrinoless double beta decay (0ν β β ) with up to 200 kg of enriched germanium detectors. The sensitivity of this experiment relies strongly on the suppression and discrimination of background events. Inverted coaxial high purity Germanium detectors provide excellent pulse shape discrimination (PSD) properties and large masses, which make them a promising candidate for 0ν β β searches. However, events originating near the passivated surface of these detectors can induce background at the region of interest which are not distinguishable with standard PSD methods. Therefore a detailed understanding of the shape of background events near the surfaces is crucial. This talk will present results of dedicated surface scans of an inverted coaxial detector with a collimated alpha source and focus on the pulse shape discrimination of those surface events.

This work has been supported by the German Federal Ministry for Education and Research (BMBF)