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 journalArticle

24 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 100 keV (nuclear recoil energy). 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)451-453
Number of pages3
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume579
Issue number1
DOIs
StatePublished - Aug 21 2007

Keywords

  • Dark matter
  • Liquid xenon
  • Time projection chamber

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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