Results From the First Use of Low Radioactivity Argon in a Dark Matter Search - INSPIRE

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Results From the First Use of Low Radioactivity Argon in a Dark Matter Search

DarkSide

Collaboration

Oct 2, 2015

7 pages

Published in:

Phys.Rev.D 93 (2016) 8, 081101,
Phys.Rev.D 95 (2017) 6, 069901 (addendum)

Published: Apr 8, 2016

e-Print:

1510.00702 [astro-ph.CO]

DOI:

10.1103/PhysRevD.93.081101,
10.1103/PhysRevD.95.069901 (addendum)

PDG: For

{\mathit m}_{{{\mathit X}^{0}}}

Report number:

FERMILAB-PUB-15-436-AE-E

Experiments:

DARKSIDE

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Abstract: (APS)

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).

Note:

Accepted by Phys. Rev. D

argon: radioactivity
radioactivity: low
argon: target
WIMP: mass
dark matter: scattering
atmosphere
time projection chamber
WIMP: direct detection
Gran Sasso

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