Institute: MPI für Physik     Collection: YB 2016     Display Documents

ID: 716061.0, MPI für Physik / YB 2016
A detector module with highly efficient surface-alpha event rejection operated in CRESST-II Phase 2
Authors:
Date of Publication (YYYY-MM-DD):2015
Title of Journal:European Physical Journal C
Journal Abbrev.:Eur.Phys.J.C
Issue / Number:75
Start Page:352
End Page:360
Audience:Not Specified
Intended Educational Use:No
Abstract / Description: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.
Classification / Thesaurus:CRESST
Comment of the Author/Creator:8 pages, 5 figures
External Publication Status:published
Document Type:Article
Communicated by:MPI für Physik
Affiliations:
Identifiers:
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