Abstract
The COBRA Experiment intends to use CdZnTe coplanar grid (CPG) detectors to search for neutrinoless double beta-decay. The current demonstrator phase with 64 detectors with a volume of (10 × 10 × 10) mm3 showed that a long-term low-background experiment using CdZnTe is feasible. In the next stage, (20 × 20 × 15) mm3 detectors with a coplanar quad-grid (CPqG) will be used. The use of larger devices will not only lead to a higher detection efficiency, but can also help to suppress surface related backgrounds and allows for easier instrumentation. The CPqG is used to maintain good energy resolution. Several detectors are investigated in various laboratory set-ups at TU Dortmund and TU Dresden. Here, results from a spatially resolved scanning of one detector with a collimated 137Cs-source are shown. A beam with a diameter of about 1 mm is used to map the detector performance depending on the source position. With this technique we found that the CPqG does not lead to severe non-uniformities even in parts of the detector where two anode grids are adjacent. We were also able to verify the reconstruction of the interaction-depth in CPqG devices and found that its performance is comparable to single grid detectors. We conclude that (20 × 20 × 15) mm3 CPqG detectors made from CdZnTe are suitable to be used in the future of COBRA.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
