Characterization of the background spectrum in DAMIC at SNOLAB
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Identificadores
URI: https://hdl.handle.net/10902/28223ISSN: 2470-0010
ISSN: 2470-0029
ISSN: 1550-7998
ISSN: 1550-2368
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2022Derechos
Attribution 4.0 International © CERN, for the benefit of the CMS collaboration
Publicado en
Physical Review D, 2022, 105, 062003
Editorial
American Physical Society
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Resumen/Abstract
We construct the first comprehensive radioactive background model for a dark matter search with charge-coupled devices (CCDs). We leverage the well-characterized depth and energy resolution of the DAMIC at SNOLAB detector and a detailed GEANT4-based particle-transport simulation to model both bulk and surface backgrounds from natural radioactivity down to 50 eVee. We fit to the energy and depth distributions of the observed ionization events to differentiate and constrain possible background sources, for example, bulk 3H from silicon cosmogenic activation and surface 210Pb from radon plate-out. We observe the bulk background rate of the DAMIC at SNOLAB CCDs to be as low as 3.1±0.6 counts kg−1 day−1 keV−1ee, making it the most sensitive silicon dark matter detector. Finally, we discuss the properties of a statistically significant excess of events over the background model with energies below 200 eVee.
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