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T: Fachverband Teilchenphysik

T 53: Dark Matter II

T 53.10: Vortrag

Mittwoch, 1. April 2020, 18:45–19:00, H-HS XIV

Charge-carrier collective effects in Ge detectors and the impact for Legend — •Tommaso Comellato, Matteo Agostini, and Stefan Schönert for the LEGEND collaboration — Technical University of Munich, München, Deutschland

The state-of-the-art technology in germanium crystals allows the production of detector blanks with lengths and diameters of  10cm, and a level of impurities in the range of 10¹⁰ atoms/cm³. With these values, such crystals can be converted into High Purity Germanium (HPGe) detectors. In such devices, the time structure of the signal can be used to discriminate the topology of the energy deposition. This is exploited in the search for neutrinoless double beta (0νββ) decay of ⁷⁶Ge, where HPGe detectors enriched in ⁷⁶Ge are used simultaneously as source and detector (Gerda, Legend). In the effort to enlarge the detector dimensions, new geometries such as the Inverted Coaxial have been recently developed[1][2]. In this new type of detectors the time needed to collect electrons and holes is much larger than the detectors used in the current 0νββ experiments. Longer collection times lead to the observation of subleading effects in the signal formation due to the self-interaction of the electron and hole clusters during their migration. In this talk I will present the impacts that such effects have on signal shape and on pulse shape discrimination performance. This work has been supported in part by the German Federal Ministry for Education and Research (BMBF) Verbundforschung 05A17W02.

[1] R. J. Cooper et al., Nucl. Instrum. Meth. A665 (2011) 25

[2] A. Domula et al., Nucl. Instrum. Meth. A891 (2018) 106