Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 91: Experimentelle Methoden der Astroteilchenphysik IV

T 91.8: Talk

Thursday, March 22, 2018, 18:15–18:30, Z6 - SR 2.011

Performance of a custom designed prototype inverted coaxial HPGe detector for Legend — •Tommaso Comellato, Matteo Agostini, Andrea Lazzaro, Christoph Wiesinger, and Stefan Schönert — Technische Universität München, Garching, Germany

Initially, the newly formed Legend collaboration plans to operate up to 200 kg of enriched germanium detectors in the upgraded Gerda infrastructure at Lngs, Italy. The science goal is to search for the neutrinoless double beta decay of ⁷⁶Ge. In the current Gerda and Majorana Demonstrator experiments, enriched HPGe detectors with excellent pulse shape discrimination (PSD) properties are being operated. Their masses are however typically below one kilogram. To reduce backgrounds from close by parts as cables and holders, larger mass detectors without compromising the PSD performance are required for Legend. A novel detector geometry, referred to as inverted coaxial, is now the baseline design of Legend HPGe detectors. A custom designed inverted coaxial detector with 1.6 kg mass was produced in collaboration with Baltic Scientific Instruments and the Helmholtz Research Center Rossendorf, and is currently comprehensively characterized at TUM. In this talk I will present the latest results about the performance of this detector including the charge collection, signal shape properties and pulse shape discrimination performance.

This work has been supported by the German Federal Ministry for Education and Research (BMBF) Verbundforschung 05A17W02 and the German Research Foundation (DFG) via the SFB1258.