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).

Agnes, P., Agostino, L., Albuquerque, I.F.M., Alexander, T., Alton, A.K., Arisaka, K., et al. (2016). Results from the first use of low radioactivity argon in a dark matter search. PHYSICAL REVIEW D, 93(8), 081101 [10.1103/PhysRevD.93.081101].

Results from the first use of low radioactivity argon in a dark matter search

BUSSINO, Severino Angelo Maria;DE VINCENZI, Mario;JAMES, IRINA;MARI, Stefano Maria;
2016

Abstract

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).
Agnes, P., Agostino, L., Albuquerque, I.F.M., Alexander, T., Alton, A.K., Arisaka, K., et al. (2016). Results from the first use of low radioactivity argon in a dark matter search. PHYSICAL REVIEW D, 93(8), 081101 [10.1103/PhysRevD.93.081101].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11590/316516
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