Aachen 2019 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 95: Neutrinos: Myon-Rekonstruktion
T 95.7: Vortrag
Donnerstag, 28. März 2019, 17:35–17:50, H11
Study of the event reconstruction for the COBRA coplanar grid quad CdZnTe detectors — •Yingjie Chu for the COBRA collaboration — TU Dresden, Institut für Kern- und Teilchenphysik, Germany
The COBRA experiment aims to measure neutrino-less double beta decay using CdZnTe detectors with a coplanar grid design. Recently the detector system was upgraded with nine 6/,/mathrmcm3 coplanar grid quad CdZnTe detectors to the extended demonstrator (XDEM). The XDEM detectors employ four independent coplanar grid electrode pairs on a single crystal surrounded by an instrumented guard-ring electrode. The purpose of this large volume combined with coplanar grid quad design is to improve the detection efficiency as well as maintain the good energy resolution. Signals can be read out from each grid and be processed separately. A reconstruction of the deposited energy based on the sum of the anode signal amplitudes from four grid pairs could be achieved. Furthermore, the spectral performance as a function of the interaction depth could also be measured.
This talk focuses on the event reconstruction method for XDEM detectors. First results of an improved energy reconstruction and interaction depth determination are presented. In order to improve the energy resolution, further corrections due to the contributions of electron trapping and charge sharing effects on the signals are reported.