CaWO4 crystals as scintillators for cryogenic dark matter search

J. Ninković, G. Angloher, C. Bucci, C. Cozzini, T. Frank, D. Hauff, H. Kraus, B. Majorovits, V. Mikhailik, F. Petricca, F. Pröbst, Y. Ramachers, W. Rau, W. Seidel, S. Uchaikin

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Although it is well known that CaWO4 is a scintillator it is not often used, mainly because it has a slow light response. However, a high Z and a good light output make this crystal a candidate for use in direct dark matter search experiments. The Cryogenic Rare Event Search using Superconducting Thermometers (CRESST II) experiment looks for hypothetical massive elementary particles called Weakly Interacting Massive Particles (WIMPs). In an elastic collision of WIMPs with ordinary matter a WIMP transfers part of its energy to a nucleus. Such nuclear recoils are the signals dark matter searches look for. CRESST is using CaWO4 crystals with coincident detection of phonons and scintillation light to suppress radioactive background. Light output and energy resolution of different CaWO4 samples were systematically measured. Best samples have an energy resolution at the 137Cs line (661 keV)<8%. As CRESST is a rare event search experiment it has to prevent the background caused by natural radioactivity; therefore, a study of the radiopurity of CaWO4 crystals has been performed. X-ray luminescence properties of crystal samples, in the temperature range 77-500 K, will be presented.

Original languageEnglish
Pages (from-to)339-343
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume537
Issue number1-2 SPEC. ISS.
DOIs
Publication statusPublished - 21 Jan 2005

    Fingerprint

Keywords

  • CaWO
  • Dark matter
  • Radiopurity
  • Scintillation properties

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

Cite this

Ninković, J., Angloher, G., Bucci, C., Cozzini, C., Frank, T., Hauff, D., Kraus, H., Majorovits, B., Mikhailik, V., Petricca, F., Pröbst, F., Ramachers, Y., Rau, W., Seidel, W., & Uchaikin, S. (2005). CaWO4 crystals as scintillators for cryogenic dark matter search. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 537(1-2 SPEC. ISS.), 339-343. https://doi.org/10.1016/j.nima.2004.08.039