Performance of ZnMoO4ZnMoO_4 crystal as cryogenic scintillating bolometer to search for double beta decay of molybdenum

Oct, 2010
12 pages
Published in:
  • JINST 5 (2010) P11007
e-Print:

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Abstract: (arXiv)
Zinc molybdate (ZnMoO4) single crystals were grown for the first time by the Czochralski method and their luminescence was measured under X ray excitation in the temperature range 85-400 K. Properties of ZnMoO4 crystal as cryogenic low temperature scintillator were checked for the first time. Radioactive contamination of the ZnMoO4 crystal was estimated as <0.3 mBq/kg (228-Th) and 8 mBq/kg (226-Ra). Thanks to the simultaneous measurement of the scintillation light and the phonon signal, the alpha particles can be discriminated from the gamma/beta interactions, making this compound extremely promising for the search of neutrinoless Double Beta Decay of 100-Mo. We also report on the ability to discriminate the alpha-induced background without the light measurement, thanks to a different shape of the thermal signal that characterizes gamma/beta and alpha particle interactions.
  • ZnMoO4 crystals
  • X ray Luminescence
  • Cryogenic scintillators
  • Bolometers
  • Double Beta Decay
  • scintillation counter: cryogenics
  • double-beta decay: (0neutrino)
  • scintillation counter: crystal
  • helium: background
  • molybdenum: double-beta decay