First measurement of the ionization yield of nuclear recoils in liquid argon
Abstract
This Letter details a measurement of the ionization yield (Qy) of 6.7 keV 40Ar atoms stopping in a liquid argon detector. The Qy of 3.6-6.3 detected e-/keV, for applied electric fields in the range 240--2130 V/cm, is encouraging for the use of this detector medium to search for the signals from hypothetical dark matter particle interactions and from coherent elastic neutrino nucleus scattering. A significant dependence of Qy on the applied electric field is observed and explained in the context of ion recombination.
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