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Results from the first use of low radioactivity argon in a dark matter search [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2016.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
PDF-file: 9 pages; size: 0.5 Mbytes
Additional Creators
Lawrence Livermore National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Liquid argon is a bright scintillator with potent particle identification properties, making it an attractive target for direct-detection dark matter searches. The DarkSide-50 dark matter search here reports the first WIMP search results obtained using a target of low-radioactivity argon. DarkSide-50 is a dark matter detector, using a two-phase liquid argon time projection chamber, located at the Laboratori Nazionali del Gran Sasso. The underground argon is shown to contain 39 Ar at a level reduced by a factor ( 1.4 ± 0.2 ) × 10 3 relative to atmospheric argon. We report a background-free null result from ( 2616 ± 43 ) kg d of data, accumulated over 70.9 live days. When combined with our previous search using an atmospheric argon, the 90% C.L. upper limit on the WIMP-nucleon spin-independent cross section, based on zero events found in the WIMP search regions, is 2.0 × 10 - 44 cm 2 ( 8.6 × 10 - 44 cm 2 , 8.0 × 10 - 43 cm 2 ) for a WIMP mass of 100 GeV / c 2 ( 1 TeV / c 2 , 10 TeV / c 2 ).
Report Numbers
E 1.99:llnl-jrnl--737497
llnl-jrnl--737497
Subject(s)
Note
Published through SciTech Connect.
04/01/2016.
"llnl-jrnl--737497"
Physical Review D 93 8 ISSN 2470-0010; PRVDAQ AM
Agnes, P.; Agostino, L.; Albuquerque, I.; Alexander, T.; Alton, A.; Arisaka, K.; Back, H.; Baldin, B.; Biery, K.; Bonfini, G.; Bossa, M.; Bottino, B.; Brigatti, A.; Brodsky, J.; Budano, F.; Bussino, S.; Cadeddu, M.; Cadonati, L.; Cadoni, M.; Calaprice, F.; Canci, N.; Candela, A.; Cao, H.; Cariello, M.; Carlini, M.; et al.
Funding Information
AC52-07NA27344
View MARC record | catkey: 23494740