Beta/gamma and alpha backgrounds in CRESST-II Phase 2
| Autor: | 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. |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | JCAP 1506 (2015) 030 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/1475-7516/2015/06/030 |
| Popis: | 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 3.51/[kg keV day] (1-40 keV) and the total intrinsic alpha activity from natural decay chains of $3.08\pm0.04$ mBq/kg are the lowest reported for CaWO$_4$ 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. Comment: 17 pages, 7 figures, 3 tables |
| Databáze: | arXiv |
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