A study of the trace Ar-39 content in argon from deep underground sources

作者：Xu J^*; Calaprice F; Galbiati C; Goretti A; Guray G; Hohman T; Holtz D; Ianni An; Laubenstein M; Loer B; Love C; Martoff C J; Montanari D; Mukhopadhyay S; Nelson A; Rountree S D; Vogelaar R B; Wright A

来源：Astroparticle Physics, 2015, 66: 53-60.

DOI：10.1016/j.astropartphys.2015.01.002

• Underground argon
• Ar-29
• Dark matter instrumentation
• Low-radioactivity technique
• Low-background counting

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.

• 出版日期2015-6