Institute: MPI für Physik     Collection: YB 2016     Display Documents

ID: 715816.0, MPI für Physik / YB 2016
Precision Measurements of Light Quenching in CaWO4 Crystals at mK Temperatures
Authors:
Date of Publication (YYYY-MM-DD):2014
Title of Journal:European Physical Journal C
Journal Abbrev.:Eur.Phys.J.C
Issue / Number:74
Start Page:2957
Audience:Not Specified
Intended Educational Use:No
Abstract / Description: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 QFs and a variation between different CaWO$_4$ single crystals were observed for the first time. For typical CRESST detectors the QFs in the region-of-interest (10-40$\\,$keV) are $QF_O^{ROI}=(11.2\\pm0.5)\\,$%, $QF_{Ca}^{ROI}=(5.94\\pm0.49)\\,$% and $QF_W^{ROI}=(1.72\\pm0.21)\\,$%. 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.
Classification / Thesaurus:CRESST
Comment of the Author/Creator:5 pages, 5 figures, 2 tables
External Publication Status:published
Document Type:Article
Communicated by:MPI für Physik
Affiliations:
Identifiers:
 Full Text: You have privileges to view the following file(s): arxiv:1401.3332.pdf   Uploading file not finished...
 The scope and number of records on eDoc is subject to the collection policies defined by each institute - see "info" button in the collection browse view.