Journal
ASTROPARTICLE PHYSICS
Volume 66, Issue -, Pages 53-60Publisher
ELSEVIER
DOI: 10.1016/j.astropartphys.2015.01.002
Keywords
Underground argon; Ar-29; Dark matter instrumentation; Low-radioactivity technique; Low-background counting
Funding
- NSF [PHY0704220, PHY0957083]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1413031] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1103987, 1242585] Funding Source: National Science Foundation
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The discovery of argon from deep underground sources with significantly less Ar-39 than atmospheric argon was an important step in the development of direct dark matter detection experiments using argon as the active target. We report on the design and operation of a low-background single-phase liquid argon detector that was built to study the Ar-39 content of this underground argon. Underground argon from the Kinder Morgan CO2 plant in Cortez, Colorado was determined to have less than 0.65% of the Ar-39 activity in atmospheric argon, or 6.6 mBq/kg specific Ar-39 activity. (C) 2015 Elsevier B.V. All rights reserved.
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