NDLI: Results of Quenching Factor Measurements of CaWO $$_4$$ at mK Temperatures for the Direct Dark Matter Search Experiment CRESST

Content Provider	Springer Nature Link
Author	Strauss, R. Ciemniak, C. Deuter, G. Feilitzsch, F. V. Gütlein, A. Hagn, H. Hellgartner, D. Jochum, J. Lanfranchi, J. C. Münster, A. Potzel, W. Roth, S. Rottler, K. Sailer, C. Scholl, S. Sivers, M. V. Usherov, I. Wawoczny, S. Willers, M. Wüstrich, M. Zöller, A.
Copyright Year	2014
Abstract	The CRESST experiment aims at a direct detection of WIMP dark matter (DM) using scintillating CaWO $$_4$$ crystals operated as phonon detectors at mK temperatures. An important feature of the experiment is the active background discrimination technique exploiting the different light outputs depending on the kind of particle interaction. The reduced light yield of nuclear recoils compared to electron recoils is quantified by quenching factors (QFs). The precise measurement of the QFs and thus the identification of the individual recoiling nucleus in the multi-target material CaWO $$_4$$ is crucial for neutron background discrimination and assuming a positive DM signal would allow to a certain extent WIMP-mass spectroscopy. At the Munich tandem accelerator a dedicated neutron scattering facility has been set up to measure the QFs of CaWO $$_4$$ , in particular that of tungsten, at mK temperatures. Monoenergetic neutrons (11 MeV) produced by the accelerator are scattered off a CRESST-like detector module that is operated in a dilution refrigerator. In this setup, the recoiling nucleus (O, Ca and W) is identified by time-of-flight measurement in liquid-scintillator detectors placed at fixed scattering angles. The QF of W could be determined with unprecedented accuracy at mK temperatures and under realistic measurement conditions: $$QF_W=0.0196\pm 0.0022$$ (preliminary value).
Starting Page	905
Ending Page	910
Page Count	6
File Format	PDF
ISSN	00222291
Journal	Journal of Low Temperature Physics
Volume Number	176
Issue Number	5-6
e-ISSN	15737357
Language	English
Publisher	Springer US
Publisher Date	2014-01-23
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Dark matter CRESST Quenching factor CaWO $$_4$$ Condensed Matter Physics Characterization and Evaluation of Materials Magnetism, Magnetic Materials
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Materials Science

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