Interplay between scintillation and ionization in liquid xenon Dark Matter searches
arXiv:1011.3990 · doi:10.1016/j.astropartphys.2011.06.008
Abstract
We provide a new way of constraining the relative scintillation efficiency L_eff for liquid xenon. Using a simple estimate for the electronic and nuclear stopping powers together with an analysis of recombination processes we predict both the ionization and the scintillation yields. Using presently available data for the ionization yield, we can use the correlation between these two quantities to constrain L_eff from below. Moreover, we argue that more reliable data on the ionization yield would allow to verify our assumptions on the atomic cross sections and to predict the value of L_eff. We conclude that the relative scintillation efficiency should not decrease at low nuclear recoil energies, which has important consequences for the robustness of exclusion limits for low WIMP masses in liquid xenon Dark Matter searches.
11 pages, 6 figures. Version accepted in Astroparticle Physics. Enhanced discussion and additional figures
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- Direct detection data and possible hints for low-mass WIMPs
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- Lindhard integral equation with binding energy applied to light and charge yields of nuclear recoils in noble liquid detectors
- Ionization Yield from Nuclear Recoils in Liquid-Xenon Dark Matter Detection