The COBRA demonstrator at the LNGS underground laboratory

J. Ebert, M. Fritts, D. Gehre, C. Gößling, T. Göpfert, C. Hagner, N. Heidrich, R. Klingenberg, T. Köttig, K. Kröninger, T. Michel, T. Neddermann, C. Nitsch, C. Oldorf, T. Quante, S. Rajek, H. Rebber, O. Reinecke, K. Rohatsch, O. SchulzA. Sörensen, I. Stekl, J. Tebrügge, R. Temminghoff, R. Theinert, J. Timm, T. Wester, B. Wonsak, S. Zatschler, K. Zuber

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

The COBRA demonstrator, a prototype for a large-scale experiment searching for neutrinoless double beta-decay, was built at the underground laboratory Laboratori Nazionali del Gran Sasso (LNGS) in Italy. It consists of an array of 64 monolithic, calorimetric CdZnTe semiconductor detectors with a coplanar-grid design and a total mass of 380 g. It is used to investigate the experimental challenges faced when operating CdZnTe detectors in low-background mode, to identify potential background sources and to show the long-term stability of the detectors. The first data-taking period started in 2011 with a subset of the detectors, while the demonstrator was completed in November 2013. To date, more than 250 kg d of data have been collected. This paper describes the technical details of the experimental setup and the hardware components.

Original languageEnglish (US)
Pages (from-to)114-120
Number of pages7
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume807
DOIs
StatePublished - Jan 21 2016

Bibliographical note

Funding Information:
We thank the LNGS for the continuous support of the COBRA experiment. We explicitly thank Ralf Wischnewski, Hardy Simgen, Matthias Laubenstein and Matthias Junker for their support and contributions to the experiment. COBRA is supported by the German Research Foundation DFG (grant number: GO 1133/3-1 ).

Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.

Keywords

  • CZT
  • CdZnTe
  • Coplanar-grid
  • Neutrinoless double beta-decay
  • Semiconductor detector

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