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Liquid Xenon (LXe) is an excellent material for experiments designed todetect dark matter in the form of Weakly Interacting Massive Particles (WIMPs).A low energy detection threshold is essential for a sensitive WIMP search. Theunderstanding of the relative scintillation efficiency (Leff) and ionizationyield of low energy nuclear recoils in LXe is limited for energies below 10keV. In this paper, we present new measurements that extend the energy down to4 keV, finding that Leff decreases with decreasing energy. We also measure thequenching of scintillation efficiency due to the electric field in LXe, findingno significant field dependence.

Scintillation efficiency and ionization yield of liquid xenon for mono-energetic nuclear recoils down to 4 keV