A detector module with highly efficient surface-alpha event rejection operated in CRESST-II Phase 2

R. Strauss, G. Angloher, A. Bento, C. Bucci, L. Canonica, A. Erb, F. von Feilitzsch, N. Ferreiro, P. Gorla, A. Gütlein, D. Hauff, J. Jochum, M. Kiefer, H. Kluck, H. Kraus, J. C. Lanfranchi, J. Loebell, A. Münster, F. Petricca, W. PotzelF. Pröbst, F. Reindl, S. Roth, K. Rottler, C. Sailer, K. Schäffner, J. Schieck, S. Scholl, S. Schönert, W. Seidel, M. von Sivers, M. Stanger, L. Stodolsky, C. Strandhagen, A. Tanzke, M. Uffinger, A. Ulrich, I. Usherov, S. Wawoczny, M. Willers, M. Wüstrich, A. Zöller

Publikation: Beitrag in FachzeitschriftArtikelBegutachtung

27 Zitate (Scopus)

Abstract

The cryogenic dark matter experiment CRESST-II aims at the direct detection of WIMPs via elastic scattering off nuclei in scintillating CaWO(Formula presented.)4 crystals. We present a new, highly improved, detector design installed in the current run of CRESST-II Phase 2 with an efficient active rejection of surface-alpha backgrounds. Using CaWO(Formula presented.)4 sticks instead of metal clamps to hold the target crystal, a detector housing with fully-scintillating inner surface could be realized. The presented detector (TUM40) provides an excellent threshold of (Formula presented.)∼0.60 keV and a resolution of (Formula presented.)σ≈0.090 keV (at 2.60 keV). With significantly reduced background levels, TUM40 sets stringent limits on the spin-independent WIMP-nucleon scattering cross section and probes a new region of parameter space for WIMP masses below 3 GeV/c(Formula presented.)2. In this paper, we discuss the novel detector design and the surface-alpha event rejection in detail.

OriginalspracheEnglisch
Aufsatznummer352
FachzeitschriftEuropean Physical Journal C
Jahrgang75
Ausgabenummer8
DOIs
PublikationsstatusVeröffentlicht - 1 Aug. 2015

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