Münster 2017 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 72: Postersitzung Teilchenphysik
T 72.4: Poster
Dienstag, 28. März 2017, 16:45–19:00, F Foyer
Interaction Depth Reconstruction in (20 × 20 × 15) mm3 Coplanar-Quad-Grid CdZnTe Detectors — •Robert Temminghoff for the COBRA collaboration — Exp. Physik IV, TU Dortmund
The aim of the COBRA collaboration is to use CdZnTe detectors to search for neutrinoless double beta-decay. Currently, COBRA is investigating (20 × 20 × 15) mm3 CdZnTe detectors that will be used in the extended demonstrator (XDEM) phase of the experiment. A coplanar-quad-grid (CPqG) read-out is used to capture the charge signal on these detectors. This electrode design allows to overcome the problem of hole trapping in CdZnTe by making use of single-polarity charge sensing achieved by the coplanar-grid. Using four grids on a single detector helps to further improve the spectroscopic performance of the device.
The coplanar-grid also allows to obtain information about the interaction depth of an event, a very powerful tool for COBRA. It allows to veto signals due to contaminations near the electrodes of the detector and thus to achieve a lower background level.
An investigation of the performance of the interaction depth reconstruction of a coplanar-quad-grid detector is shown. A collimated 137Cs-source was used to irradiate the detector at different depths. With this data it is possible to experimentally test the interaction depth reconstruction for coplanar-quad-grid detectors. Furthermore, two different formulas to calculate the interaction depth are compared.