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          Institute: MPI für Physik     Collection: MPI für Physik     Display Documents



ID: 544271.0, MPI für Physik / MPI für Physik
Scintillator Non-Proportionality and Gamma Quenching in CaWO4
Authors:Lang, R. F.; Angloher, G.; Bauer, M.; Bavykina, I.; Bento, A.; Brown, A.; Bucci, C.; Ciemniak, C.; Coppi, C.; Deuter, G.; von Feilitzsch, F.; Hauff, D.; Henry, S.; Huff, P.; Imber, J.; Ingleby, S.; Isaila, C.; Jochum, J.; Kiefer, M.; Kimmerle, M.; Kraus, H.; Lanfranchi, J. -C.; Malek, M.; McGowan, R.; Mikhailik, V. B.; Pantic, E.; Petricca, F.; Pfister, S.; Potzel, W.; Pröbst, F.; Roth, S.; Rottler, K.; Sailer, C.; Schäffner, K.; Schmaler, J.; Scholl, S.; Seidel, W.; Stodolsky, L.; Tolhurst, A. J. B.; Usherov, I.; Westphal, W.
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:We measure and explain scintillator non-proportionality and gamma quenching of CaWO4 at low energies and low temperatures. Phonons that are created following an interaction in the scintillating crystal at temperatures of 15mK are used for a calorimetric measurement of the deposited energy, and the scintillation light is measured with a separate cryogenic light detector. Making use of radioactivity intrinsic to the scintillating crystal, the scintillator non-proportionality is mapped out to electron energies <5keV. The observed behavior is in agreement with a simple model based on Birks' law and the stopping power dE/dx for electrons. We find for Birks' constant $k_B=(18.5\pm0.7)$nm/keV in CaWO4. Gamma lines allow a measurement of the reduced light yield of photons with respect to electrons, as expected in the presence of scintillator non-proportionality. In particular, we show that gamma-induced events in CaWO4 give only about 90 percent of the light yield of electrons, at energies between 40keV and 80keV.
Classification / Thesaurus:CRESST
Comment of the Author/Creator:5 pages, 5 figures
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Physik
Identifiers:LOCALID:MPP-2009-191
URL:http://www.slac.stanford.edu/spires/find/hep/www?r...
URL:http://arXiv.org/abs/arxiv:0910.4414
URL:http://publications.mppmu.mpg.de/?action=search&mp...
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