Institute: MPI für Physik     Collection: YB 2016     Display Documents

ID: 716062.0, MPI für Physik / YB 2016
Beta/gamma and alpha backgrounds in CRESST-II Phase 2
Authors:
Date of Publication (YYYY-MM-DD):2015
Title of Journal:Journal of Cosmology and Astroparticle Physics
Journal Abbrev.:JCAP
Issue / Number:1506
Start Page:030
Audience:Not Specified
Intended Educational Use:No
Abstract / Description: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 $3.08\\pm0.04\\,$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.
Classification / Thesaurus:CRESST
Comment of the Author/Creator:8 pages, 5 figures, 3 tables
External Publication Status:published
Document Type:Article
Communicated by:MPI für Physik
Affiliations:
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