Abstract
The excellent scintillation characteristics of argon, including a high light yield and strong discrimination between minimum and highly ionizing particles, make it a valuable material for use in a variety of detectors, most notably detectors or WIMP-induced nuclear recoils. However, the presence of the cosmogenically induced radioactive isotope 39Ar in atmospheric argon generates a background rate of ∼1 Bq/kg atmospheric argon. We have recently identified sources of argon in underground reservoirs with 39Ar content reduced by at least a factor of 20 (limit only) with respect to atmospheric argon. This brings multi-ton scale liquid argon detectors into the realm of possibility.
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