Measurement of light and charge yield of low-energy electronic recoils in liquid xenon

Abstract

The dependence of the light and charge yield of liquid xenon on the applied electric field and recoil energy is important for dark matter detectors using liquid xenon time projections chambers. Few measurements have been made of this field dependence at recoil energies less than 10 keV. In this paper we present results of such measurements using a specialized detector. Recoil energies are determined via the Compton coincidence technique at four drift fields relevant for liquid xenon dark matter detectors: 0.19, 0.48, 1.02, and 2.32 kV/cm. Mean recoil energies down to 1 keV were measured with unprecedented precision. We find that the charge and light yield are anti-correlated above 3 keV, and that the field dependence becomes negligible below 6 keV. However, below 3 keV we find a charge yield significantly higher than expectation and a reconstructed energy deviating from linearity.

17 pages, 9 figures

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• Physics reach of the XENON1T dark matter experiment
• Tritium calibration of the LUX dark matter experiment
• Exclusion of Leptophilic Dark Matter Models using XENON100 Electronic Recoil Data
• Search for Event Rate Modulation in XENON100 Electronic Recoil Data
• Experimental study of ionization yield of liquid xenon for electron recoils in the energy range 2.8 - 80 keV
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