Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 22: Instrumentation
HK 22.2: Vortrag
Montag, 4. März 2013, 17:15–17:30, HSZ-405
Identifying Surface Background Events in the COBRA-Experiment — •Matthew Fritts1 and Jan Tebrügge2 — 1Institut für Kern- und Teilchenphysik (IKTP), Technische Universität Dresden — 2Lehrstuhl Experimentelle Physik IV, Technische Universität Dortmund
The COBRA-Experiment searches for neutrinoless double beta decay in CdZnTe semiconductor detectors. In the R&D setup at Gran Sasso Underground Laboratory coplanar grid detectors are investigated. Intrinsic to the detector design is the ability to calculate interaction depth, which makes it possible to veto surface events at the anode and cathode side. Furthermore the details of charge induction due to the grid geometry cause distortions in pulse shapes for interactions near the other surfaces. The COBRA collaboration has developed an improved depth reconstruction technique as well as new methods for identifying events near the lateral surfaces using pulse-shape analysis. Alpha radiation at the surface of the detectors is currently the major source of background in the energy region of interest, so using pulse shape analysis offers promising possibilities for background reduction, which is a crucial issue for the COBRA-Experiment.