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T: Fachverband Teilchenphysik
T 99: Detektorsysteme IV
T 99.7: Vortrag
Donnerstag, 3. März 2016, 18:15–18:30, VMP8 SR 205
Characterization of a large CdZnTe coplanar quad-grid semiconductor detector — •Robert Theinert, Claus Gößling, and Kevin Kröninger — TU Dortmund, Experimentelle Physik IV, 44221 Dortmund, D
The COBRA collaboration aims to search for the neutrinoless double beta-decay of 116Cd. For this purpose, it operates a demonstrator setup with 64 CdZnTe detectors, each with a volume of 1 cm3, at the LNGS underground laboratory in Italy. Double beta-decays are associated with half-lifes of more than 1025 years. To be sensitive to those half-lifes, a high detection efficiency and an ultra low-background setup are, among other aspects, important requirements.
The usage of larger detectors is expected to improve the sensitivity. Detectors with a larger volume have a higher detection efficiency than the smaller ones. In addition, the background is reduced due to the lower surface-to-volume ratio.
A large (2 × 2 × 1.5) cm3 CdZnTe detector with a new coplanar-grid design is characterized for applications in γ-ray spectroscopy and low-background operation. The four coplanar-grids on the anode side offer the possibility of separating the detector in four single sectors. The electric properties as well as the spectrometric performance, like energy response and resolution, are investigated in several measurements. Furthermore, studies concerning the operational stability and the possibility to identify multiple-scattered photons, are conducted.