Simultaneous Measurement of Ionization and Scintillation from Nuclear Recoils in Liquid Xenon as Target for a Dark Matter Experiment

Abstract

We report the first measurements of the absolute ionization yield of nuclear recoils in liquid xenon, as a function of energy and electric-field. Independent experiments were carried out with two dual-phase time projection chamber prototypes, developed for the XENON Dark Matter project. We find that the charge yield increases with decreasing recoil energy, and exhibits only a weak field dependence. These results are a first demonstration of the capability of dual phase xenon detectors to discriminate between electron and nuclear recoils, a key requirement for a sensitive dark matter search at recoil energies down to 20 keV.

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• Scintillation Response of Liquid Xenon to Low Energy Nuclear Recoils
• Measurements of Scintillation Efficiency and Pulse-Shape for Low Energy Recoils in Liquid Xenon
• The XENON Dark Matter Search Experiment
• Measurement of the refractive index and attenuation length of liquid xenon for its scintillation light

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