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

ID: 543785.0, MPI für Physik / MPI für Physik
Commissioning Run of the CRESST-II Dark Matter Search
Authors:The CRESST Collaboration; 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.; Lang, R. F.; Majorovits, B.; Malek, M.; McGowan, R.; Mikhailik, V. B.; Pantic, E.; Petricca, F.; Pfister, S.; Potzel, W.; Proebst, F.; Rau, W.; Roth, S.; Rottler, K.; Sailer, C.; Schaeffner, K.; Schmaler, J.; Scholl, S.; Seidel, W.; Stodolsky, L.; Tolhurst, A. J. B.; Usherov, I.; Westphal, W.
Date of Publication (YYYY-MM-DD):2009
Title of Journal:Astroparticle Physics
Journal Abbrev.:Astropart.Phys.
Issue / Number:31
Start Page:270
End Page:276
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:The CRESST cryogenic direct dark matter search at Gran Sasso, searching for WIMPs via nuclear recoil, has been upgraded to CRESST-II by several changes and improvements.We present the results of a commissioning run carried out in 2007. The basic element of CRESST-II is a detector module consisting of a large (~ 300 g) CaWO_4 crystal and a very sensitive smaller (~ 2 g) light detector to detect the scintillation light from the CaWO_4.Information from light-quenching factor studies allows the definition of a region of the energy-light yield plane which corresponds to tungsten recoils. A neutron test is reported which supports the principle of using the light yield to identify the recoiling nucleus. Data obtained with two detector modules for a total exposure of 48 kg-days are presented. Judging by the rate of events in the "all nuclear recoils" acceptance region the apparatus shows a factor ~ten improvement with respect to previous results, which we attribute principally to the presence of the neutron shield. In the "tungsten recoils" acceptance region three events are found, corresponding to a rate of 0.063 per kg-day. Standard assumptions on the dark matter flux, coherent or spin independent interactions,then yield a limit for WIMP-nucleon scattering of 4.8 \times 10^{-7}pb, at M{WIMP} ~60 GeV.
Classification / Thesaurus:CRESST
Comment of the Author/Creator:10 pages, 9 figs
External Publication Status:published
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Physik
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