Journal
ASTROPARTICLE PHYSICS
Volume 30, Issue 2, Pages 54-57Publisher
ELSEVIER
DOI: 10.1016/j.astropartphys.2008.06.006
Keywords
ZEPLIN-II; Liquid xenon; Electroluminescence; Radiation detectors
Funding
- UK Particle Physics and Astronomy Research Council (PPARC)
- Portuguese FCT [POCI/FP/FNU/63446/2005]
- US DOE [DE-FG03-91ER40662]
- NSF [PHY-139065]
- STFC [PP/E006841/1, PP/E00685X/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/E006841/1, PP/E00685X/1] Funding Source: researchfish
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We present the first measurements of the electroluminescence response to the emission of single electrons in a two-phase noble gas detector. Single ionization electrons generated in liquid xenon are detected in a thin gas layer during the 31-day background run of the ZEPLIN-II experiment, a two-phase xenon detector for WIMP dark matter searches. Both the pressure dependence and magnitude of the single electron response are in agreement with previous measurements of electroluminescence yield in xenon. We discuss different photoionization processes as possible cause for the sample of single electrons studied in this work. This observation may have implications for the design and operation of future large-scale two-phase systems. (C) 2008 Elsevier B.V. All rights reserved.
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