Pulse-shape discrimination of surface events in CdZnTe detectors for the COBRA experiment

M. Fritts, J. Tebrügge, J. Durst, J. Ebert, C. Gößling, T. Göpfert, D. Gehre, C. Hagner, N. Heidrich, M. Homann, T. Köttig, T. Neddermann, C. Oldorf, T. Quante, S. Rajek, O. Reinecke, O. Schulz, J. Timm, B. Wonsak, K. Zuber

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Events near the cathode and anode surfaces of a coplanar grid CdZnTe detector are identifiable by means of the interaction depth information encoded in the signal amplitudes. However, the amplitudes cannot be used to identify events near the lateral surfaces. In this paper a method is described to identify lateral surface events by means of their pulse shapes. Such identification allows for discrimination of surface alpha particle interactions from more penetrating forms of radiation, which is particularly important for rare event searches. The effectiveness of the presented technique in suppressing backgrounds due to alpha contamination in the search for neutrinoless double beta decay with the COBRA experiment is demonstrated.

Original languageEnglish (US)
Pages (from-to)27-34
Number of pages8
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume749
DOIs
StatePublished - Jun 11 2014

Bibliographical note

Funding Information:
The COBRA Experiment would like to thank the Istituto Nazionale di Fisica Nucleare for the use of their laboratory and infrastructure at the Laboratori Nazionali del Gran Sasso , as well as the Deutsche Forschungsgemeinschaft for their support.

Keywords

  • CZT
  • Coplanar grid
  • Double beta decay
  • Lateral surface event
  • Pulse shape
  • Semiconductor detector

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