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

ID: 545048.0, MPI für Physik / MPI für Physik
Limits on WIMP dark matter using scintillating CaWO4 cryogenic detectors with active background suppression
Authors:Angloher, G.; Bucci, C.; Christ, P.; Cozzini, C.; von Feilitzsch, F.; Hauff, D.; Henry, S.; Jagemann, Th.; Jochum, J.; Kraus, H.; Majorovits, B.; Ninkovic, J.; Petricca, F.; Potzel, W.; Pröbst, F.; Ramachers, Y.; Razeti, M.; Rau, W.; Seidel, W.; Stark, M.; Stodolsky, L.; Tolhurst, A. J. B.; Westphal, W.; Wulandari, H.
Date of Publication (YYYY-MM-DD):2005
Title of Journal:Astroparticle Physics
Journal Abbrev.:Astropart.Phys.
Issue / Number:23
Start Page:325
End Page:339
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:We present first significant limits on WIMP dark matter by the phonon-light technique, where combined phonon and light signals from a scintillating cryogenic detector are used. Data from early 2004 with two 300 g CRESST-II prototype detector modules are presented, with a net exposure of 20.5 kg days. The modules consist of a CaWO4 scintillating ``target'' crystal and a smaller cryogenic light detector. The combination of phonon and light signals leads to a strong suppression of non-nuclear recoil backgrounds. Using this information to define an acceptance region for nuclear recoils we have 16 events from the two modules, corresponding to a rate for nuclear recoils between 12 and 40 keV of (0.87 +- 0.22) events/(kg day). This is compatible with the rate expected from neutron background, and most of these events lie in the region of the phonon-light plane anticipated for neutron-induced recoils. A particularly strong limit for WIMPs with coherent scattering results from selecting a region of the phonon-light plane corresponding to tungsten recoils, where the best module shows zero events.
Classification / Thesaurus:CRESST
Comment of the Author/Creator:24 pages, 11 figures, published in Astroparticle Physics 23 (2005) 325-339
External Publication Status:published
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Physik
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