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Particle detectors that use liquid xenon (LXe) as detection medium are amongthe leading technologies in the search for dark matter weakly interactingmassive particles (WIMPs). A key enabling element has been the low-energydetection threshold for recoiling nuclei produced by the interaction of WIMPsin LXe targets. In these detectors, the nuclear recoil energy scale is based onthe LXe scintillation signal and thus requires knowledge of the relativescintillation efficiency of nuclear recoils, Leff. The uncertainty in Leff atlow energies is the largest systematic uncertainty in the reported results fromLXe WIMP searches at low masses. In the context of the XENON Dark Matterproject, a new LXe scintillation detector has been designed and builtspecifically for the measurement of Leff at low energies, with an emphasis onmaximizing the scintillation light detection efficiency to obtain the lowestpossible energy threshold. We report new measurements of Leff at low energiesperformed with this detector. Our results suggest a Leff which slowly decreaseswith energy, from 0.144 +/- 0.009 at 15 keV down to 0.088 +0.014 -0.015 at 3keV.

New Measurement of the Scintillation Efficiency of Low-Energy Nuclear Recoils in Liquid Xenon