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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.v. 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. Potzel
; F. Pröbst
; F. Reindl
; S. Roth
; K. Rottler
; C. Sailer
; K. Schäffner
; J. Schieck
; S. Scholl
; S. Schönert
; W. Seidel
; M.v. Sivers
; M. Stanger
; L. Stodolsky
; C. Strandhagen
; A. Tanzke
; M. Uffinger
; A. Ulrich
; I. Usherov
; S. Wawoczny
; M. Willers
; M. Wüstrich
; A. Zöller
; | | Date: |
7 Oct 2014 | | Abstract: | The cryogenic dark matter experiment CRESST-II aims at the direct detection
of WIMPs via elastic scattering off nuclei in scintillating CaWO$_4$ 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$_4$ sticks 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 ${sim},0.60,$keV and a
resolution of $sigma,{approx},0.090,$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$^2$. In this paper, we
discuss the novel detector design and the surface-alpha event rejection in
detail. | | Source: | arXiv, 1410.1753 | | Services: | Forum | Review | PDF | Favorites | |
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