Low-Energy (<10 keV) Electron Ionization and Recombination Model for a Liquid Argon Detector

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Detailed understanding of the ionization process in noble liquid detectors is important for their use in applications such as the search for dark matter and coherent elastic neutrino-nucleus scattering. The response of noble liquid detectors to low-energy ionization events is poorly understood at this time. We describe a new simulation tool which predicts the ionization yield from electronic energy deposits (E < 10keV) in liquid Ar, including the dependence of the yield on the applied electric drift field. The ionization signal produced in a liquid argon detector from ³⁷Ar beta decay and ⁵⁵Fe X-rays has been calculated using the new model.