Würzburg 2018 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 43: Neutrinophysik II
T 43.7: Vortrag
Dienstag, 20. März 2018, 18:10–18:25, Z6 - SR 2.012
Detector Evaluation for the COBRA XDEM — •Robert Temminghoff for the COBRA collaboration — TU Dortmund, Lehrstuhl für Experimentelle Physik IV, Otto-Hahn-Straße 4, 44227 Dortmund
The COBRA experiment is designed with the goal to search for neutrinoless double beta-decay, a long sought-after process whose existence could hint at physics beyond the Standard Model. In the ongoing demonstrator phase of the experiment 64 CdZnTe detectors with a volume of 1 cm3 each are operated in the LNGS underground laboratory in Italy.
The setup is currently being extended with an additional array of nine CdZnTe detectors with a volume of 6 cm3 each (XDEM phase). These detectors will also feature an instrumented guard-ring electrode which is used to suppress surface related background contributions. Thereby the COBRA collaboration will improve the experiments background level and demonstrate the usage of large volume CdZnTe detectors for double beta-decay searches.
In this talk, results from the evaluation of the detectors used for the XDEM phase will be shown. In total ten detectors from two different manufacturers have been tested, of which the best nine will be installed at the LNGS. The evaluation includes a determination of the ideal working point as a function of the applied bulk- and grid-bias, measurements of the energy resolution and the efficiency as well as electrical tests.