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

31 Scopus citations


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
StatePublished - Jun 2015

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics


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


Dive into the research topics of 'A study of the trace 39Ar content in argon from deep underground sources'. Together they form a unique fingerprint.

Cite this