Performance and Fundamental Processes at Low Energy in a Two-Phase Liquid Xenon Dark Matter Detector

T. Shutt*, C. E. Dahl, J. Kwong, A. Bolozdynya, P. Brusov

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)160-163
Number of pages4
JournalNuclear Physics B - Proceedings Supplements
Volume173
DOIs
StatePublished - Nov 1 2007

Keywords

  • dark matter
  • liquid xenon
  • time projection chamber

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics

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