Characterization of a large CdZnTe coplanar quad-grid semiconductor detector

Abstract

The COBRA collaboration aims to search for neutrinoless double beta-decay of 116 Cd. A demonstrator setup with 64 CdZnTe semiconductor detectors, each with a volume of 1 cm 3 , is currently being operated at the LNGS underground laboratory in Italy. This paper reports on the characterization of a large 2 × 2 × 1.5 cm 3 CdZnTe detector with a new coplanar-grid design for applications in γ-ray spectroscopy and low-background operation. Several studies of electric properties as well as of the spectrometric performance, like energy response and resolution, are conducted. Furthermore, measurements including investigating the operational stability and a possibility to identify multiple-scattered photons are presented.

Suppression of alpha-induced lateral surface events in the COBRA experiment using CdZnTe detectors with an instrumented guard-ring electrode

“…Such a detector, but without a guard-ring electrode, was characterized extensively in Ref. [14]. Details of the electrode design and its dimensions are depicted in Figure 1.…”