SMuK 2023 – scientific programme

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T: Fachverband Teilchenphysik

T 11: Neutrinos, Dark Matter I

T 11.2: Talk

Monday, March 20, 2023, 16:45–17:00, POT/0051

Pulse shape analysis with quad coplanar grid CdZnTe detectors of the COBRA experiment — •Yingjie Chu — Institute of Nuclear and Particle Physics, TU Dresden

The COBRA experiment searches for double beta decays using CdZnTe room temperature semiconductor detectors operating at the Gran Sasso underground laboratory. The setup was upgraded in 2018 using nine large CdZnTe detectors with the novel electrode layout, a quad coplanar grid surrounded by a guard ring, which can veto surface contaminations intrinsically. Although the prominent surface α backgrounds identified in the previous setup are reduced with the new CdZnTe detector, nonphysical events and other background events are present in the ββ region of interest. Therefore, pulse shape discriminations are evaluated to identify the noise, distorted pulses, and multi-hit events, which enables further background suppression. After applying those discrimination cuts, significantly reduced background levels are observed. Furthermore, the pulse shape of the detector is simulated and used to investigate the efficiency of the cuts.