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

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. Here, 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).
Authors:
 [1]
  1. Universite Paris Diderot (France). et al.
Publication Date:
Report Number(s):
FERMILAB-PUB-15-436-AE-E; SLAC-PUB-16561
Journal ID: ISSN 2470-0010; PRVDAQ; arXiv eprint number arXiv:1510.00702
Grant/Contract Number:
AC02-07CH11359; FG02-91ER40671; AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 93; Journal Issue: 8; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
DarkSide Collaboration; The DarkSide Collaboration
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1226329
Alternate Identifier(s):
OSTI ID: 1246517; OSTI ID: 1257735