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

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

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

The discovery of argon from deep underground sources with significantly less 39Ar 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 39Ar 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 39Ar activity in atmospheric argon, or 6.6 mBq/kg specific 39Ar activity.

Original languageEnglish (US)
Pages (from-to)53-60
Number of pages8
JournalAstroparticle Physics
Volume66
DOIs
StatePublished - Jun 2015

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics

Keywords

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

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