Performance and Fundamental Processes at Low Energy in a Two-Phase Liquid Xenon Dark Matter Detector
arXiv:astro-ph/0608137 · doi:10.1016/j.nima.2007.04.104
Abstract
We extend the study of the performance of a prototype two-phase liquid xenon WIMP dark matter detector to recoil energies below 20 keV. We demonstrate a new method for obtaining the best estimate of the energies of events using a calibrated sum of charge and light signals and introduce the corresponding discrimination parameter, giving its mean value at 4 kV/cm for electron and nuclear recoils up to 300 and 100 keV, respectively. We show that fluctuations in recombination limit discrimination for most energies, and reveal an improvement in discrimination below 20 keV due to a surprising increase in ionization yield for low energy electron recoils. This improvement is crucial for a high-sensitivity dark matter search.
4 pages, 6 figures, submitted to DM06 conference proceedings in Nucl Phys B
References in corpus (1)
Cited by in corpus (13)
- Results from a search for dark matter in the complete LUX exposure
- The Large Underground Xenon (LUX) Experiment
- Probing sub-GeV Dark Matter with conventional detectors
- Nuclear recoil energy scale in liquid xenon with application to the direct detection of dark matter
- Ultra-Low Energy Calibration of LUX Detector using Xe Electron Capture
- Towards Probing the Diffuse Supernova Neutrino Background in All Flavors
- Experimental study of ionization yield of liquid xenon for electron recoils in the energy range 2.8 - 80 keV
- High Voltage in Noble Liquids for High Energy Physics
- Detection and Calibration of Low-Energy Nuclear Recoils for Dark Matter and Neutrino Scattering Experiments
- A New Analysis Method for WIMP searches with Dual-Phase Liquid Xe TPCs
- Direct Dark Matter Searches with CDMS and XENON
- Electronic structure of liquid xenon in the context of light dark matter direct detection
- A measurement of the mean electronic excitation energy of liquid xenon