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| Home > Publications database > Operation of CdZnTe Semiconductor Detectors in Liquid Scintillator for the COBRA Experiment |
| Book/Report/Dissertation / PhD Thesis | PUBDB-2015-03014 |
2015
Verlag Deutsches Elektronen-Synchrotron
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Please use a persistent id in citations: doi:10.3204/DESY-THESIS-2015-030
Report No.: DESY-THESIS-2015-030
Abstract: COBRA, the Cadmium-Zinc-Telluride O-neutrino double-Beta Research Apparatus, is an experiment aiming for the measurement of the neutrinoless double beta decay with several isotopes, in particular Cd-116, Cd-106 and Te-130. A highly granular large scale experiment with about 400 kg of CdZnTe semiconductor detectors is currently under development. To provide evidence for the neutrinoless double beta decay of Cd-116, a background rate in the order of 10e-3 counts/keV/kg/a is needed to achieve the required half-life sensitivity of at least 2*10e26 years. To reach this target, the detectors have to be operated in a highly pure environment, shielded from external radiation. Liquid scintillator is a promising candidate as acircumfluent replacement for the currently used lacquer. Next to the function as highly pure passivation material, liquid scintillator also acts as a neutron shield and active veto for external gammas. Within this thesis, the design, construction and assembly of a test set-up is described. The operation of four CdZnTe detectors after several years of storage in liquid scintillator is demonstrated. Next to extensive material compatibility tests prior to the assembly, the commissioning of the set-up and the characterization of the detectors are shown. Finally, results concerning the background reduction capability of liquid scintillator and the detection of cosmic muons are presented and compared to a Monte Carlo simulation.
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