Report
Energy-Dependent Light Quenching in CaWO$_4$ Crystals at mK Temperatures
| العنوان: | Energy-Dependent Light Quenching in CaWO$_4$ Crystals at mK Temperatures |
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| المؤلفون: | Strauss, R., Angloher, G., Bento, A., Bucci, C., Canonica, L., Carli, W., Ciemniak, C., Erb, A., Feilitzsch, F. v., Gorla, P., Gütlein, A., Hagn, H., Hauff, D., Hellgartner, D., Jochum, J., 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. |
| المصدر: | Eur.Phys.J. C74 (2014) 2957 |
| سنة النشر: | 2014 |
| المجموعة: | Astrophysics Physics (Other) |
| مصطلحات موضوعية: | Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics, Physics - Instrumentation and Detectors |
| الوصف: | Scintillating CaWO$_4$ single crystals are a promising multi-element target for rare-event searches and are currently used in the direct Dark Matter experiment CRESST (Cryogenic Rare Event Search with Superconducting Thermometers). The relative light output of different particle interactions in CaWO$_4$ is quantified by Quenching Factors (QFs). These are essential for an active background discrimination and the identification of a possible signal induced by weakly interacting massive particles (WIMPs). We present the first precise measurements of the QFs of O, Ca and W at mK temperatures by irradiating a cryogenic detector with a fast neutron beam. A clear energy dependence of the QF of O and, less pronounced, of Ca was observed for the first time. Furthermore, in CRESST neutron-calibration data a variation of the QFs among different CaWO$_4$ single crystals was found. For typical CRESST detectors the QFs in the region-of-interest (10-40$\,$keV) are $QF_O^{ROI}=(11.2{\pm}0.5)\,$%, $QF_{Ca}^{ROI}=(5.94{\pm}0.49)\,$% and $QF_W^{ROI}=(1.72{\pm}0.21)\,$%. The latest CRESST data (run32) is reanalyzed using these fundamentally new results on light quenching in CaWO$_4$ having moderate influence on the WIMP analysis. Their relevance for future CRESST runs and for the clarification of previously published results of direct Dark Matter experiments is emphasized. Comment: 6 pages, 6 figures, 2 tables |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1140/epjc/s10052-014-2957-5 |
| URL الوصول: | http://arxiv.org/abs/1401.3332 |
| رقم الانضمام: | edsarx.1401.3332 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1140/epjc/s10052-014-2957-5 |
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