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Results from the first use of low radioactivity argon in a dark matter search
Agnes, P Agostino, L Albuquerque, IFM Alexander, T Alton, AK Arisaka, K Back, HO Baldin, B Biery, K Bonfini, G
Agnes, P
Agostino, L
Albuquerque, IFM
Alexander, T
Alton, AK
Arisaka, K
Back, HO
Baldin, B
Biery, K
Bonfini, G
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Journal Article
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2016-04-08
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10.1103/PhysRevD.93.081101
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© 2016 American Physical Society. 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 Ar39 at a level reduced by a factor (1.4±0.2)×103 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 cm2 (8.6×10-44 cm2, 8.0×10-43 cm2) for a WIMP mass of 100 GeV/c2 (1 TeV/c2, 10 TeV/c2).
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Physical Review D
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