Beta/gamma and alpha backgrounds in CRESST-II Phase 2
Strauss, R. · Angloher, G. · Bento, A. · Bucci, C. · Canonica, L. · Erb, A. · Feilitzsch, F. v. · Iachellini, N. Ferreiro · Gorla, P. · Gütlein, A. · Hauff, D. · Jochum, J. · Kiefer, M. · Kluck, H. · Kraus, H. · Lanfranchi, J. -C. · Loebell, J. · Münster, A. · Petricca, F. · Potzel, W. · Pröbst, F. · Reindl, F. · Roth, S. · Rottler, K. · Sailer, C. · Schäffner, K. · Schieck, J. · Scholl, S. · Schönert, S. · Seidel, W. · Sivers, M. v. · Stodolsky, L. · Strandhagen, C. · Tanzke, A. · Uffinger, M. · Ulrich, A. · Usherov, I. · Wawoczny, S. · Willers, M. · Wüstrich, M. · Zöller, A.
Original · EN
The experiment CRESST-II aims at the detection of dark matter with scintillating CaWO₄ crystals operated as cryogenic detectors. Recent results on spin-independent WIMP-nucleon scattering from the CRESST-II Phase 2 allowed to probe a new region of parameter space for WIMP masses below 3 GeV/c². This sensitivity was achieved after background levels were reduced significantly. We present extensive background studies of a CaWO₄ crystal, called TUM40, grown at the Technische Universität München. The average beta/gamma rate of 3.51/[kg keV day] (1-40 keV) and the total intrinsic alpha activity from natural decay chains of 3.08±0.04 mBq/kg are the lowest reported for CaWO₄ detectors. Contributions from cosmogenic activation, surface-alpha decays, external radiation and intrinsic alpha/beta emitters are investigated in detail. A Monte-Carlo based background decomposition allows to identify the origin of the majority of beta/gamma events in the energy region relevant for dark matter search.
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