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

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 liqui...

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Bibliographic Details
Published in:Astroparticle physics 2015-06, Vol.66, p.53-60
Main Authors: 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.
Format: Article
Language:English
Subjects:
39Ar
Dark matter instrumentation
Low-background counting
Low-radioactivity technique
Underground argon
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Summary: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 6.6mBq/kg specific 39Ar activity.
ISSN:0927-6505
1873-2852
DOI:10.1016/j.astropartphys.2015.01.002