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18 April 2024

» arxiv » 1410.4188

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Electron/gamma and alpha backgrounds in CRESST-II Phase 2
R. Strauss ; G. Angloher ; A. Bento ; C. Bucci ; L. Canonica ; A. Erb ; F.v. Feilitzsch ; N. Ferreiro Iachellini ; 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 ; L. Stodolsky ; C. Strandhagen ; A. Tanzke ; M. Uffinger ; A. Ulrich ; I. Usherov ; S. Wawoczny ; M. Willers ; M. Wüstrich ; A. Zöller ;
Date:	15 Oct 2014
Abstract:	The experiment CRESST-II aims at the detection of dark matter with scintillating CaWO$_4$ 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/c$^2$. This sensitivity was achieved after background levels were reduced significantly. We present extensive background studies of a CaWO$_4$ crystal, called TUM40, grown at the Technische Universit"at M"unchen. The average beta/gamma rate of 3.44/[kg$,$keV$,$day] (1-40$,$keV) and the total intrinsic alpha activity from natural decay chains of $3.08pm0.04,$mBq/kg are the lowest reported for CaWO$_4$ detectors. Contributions of gamma lines resulting from cosmogenic activation, external X-rays and intrinsic beta emitters are investigated in detail.
Source:	arXiv, 1410.4188
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