A detector module with highly efficient surface-alpha event rejection operated in CRESST-II Phase 2
Abstract
The cryogenic dark matter experiment CRESST-II aims at the direct detection of WIMPs via elastic scattering off nuclei in scintillating CaWO 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 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 keV and a resolution of keV (at 2.60keV). 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 3GeV/c. In this paper, we discuss the novel detector design and the surface-alpha event rejection in detail.
Keywords
Cite
@article{arxiv.1410.1753,
title = {A detector module with highly efficient surface-alpha event rejection operated in CRESST-II Phase 2},
author = {R. Strauss and G. Angloher and A. Bento and C. Bucci and L. Canonica and A. Erb and F. v. Feilitzsch and N. Ferreiro and P. Gorla and A. Gütlein and D. Hauff and J. Jochum and M. Kiefer and H. Kluck and H. Kraus and J. -C. Lanfranchi and J. Loebell and A. Münster and F. Petricca and W. Potzel and F. Pröbst and F. Reindl and S. Roth and K. Rottler and C. Sailer and K. Schäffner and J. Schieck and S. Scholl and S. Schönert and W. Seidel and M. v. Sivers and M. Stanger and L. Stodolsky and C. Strandhagen and A. Tanzke and M. Uffinger and A. Ulrich and I. Usherov and S. Wawoczny and M. Willers and M. Wüstrich and A. Zöller},
journal= {arXiv preprint arXiv:1410.1753},
year = {2016}
}
Comments
9 pages, 6 figures