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A liquid argon time projection chamber, constructed for the Argon Response toIonization and Scintillation (ARIS) experiment, has been exposed to the highlycollimated and quasi-monoenergetic LICORNE neutron beam at the Institute dePhysique Nuclaire Orsay in order to study the scintillation response to nuclearand electronic recoils. An array of liquid scintillator detectors, arrangedaround the apparatus, tag scattered neutrons and select nuclear recoil energiesin the [7, 120] keV energy range. The relative scintillation efficiency ofnuclear recoils was measured to high precision at null field, and theion-electron recombination probability was extracted for a range of appliedelectric fields. Single Compton scattered electrons, produced by gammas emittedfrom the de-excitation of $^7$Li* in coincidence with the beam pulse, alongwith calibration gamma sources, are used to extract the recombinationprobability as a function of energy and electron drift field. The ARIS resultshave been compared with three recombination probability parameterizations(Thomas-Imel, Doke-Birks, and PARIS), allowing for the definition of a fullycomprehensive model of the liquid argon response to nuclear and electronicrecoils down to a few keV range. The constraints provided by ARIS to the liquidargon response at low energy allow the reduction of systematics affecting thesensitivity of dark matter search experiments based on liquid argon

Measurement of the liquid argon energy response to nuclear and electronic recoils