Measurement of single electron emission in two-phase xenon

Details Measurement of single electron emission in two-phase xenon Measurement of single electron emission in two-phase xenon

2007-08-06

arxiv.org/abs/0708.0768v1

Astropart.Phys.30:54-57,2008

Physics

Instrumentation and Detectors

11 pages, 6 figures

Scientific paper

10.1016/j.astropartphys.2008.06.

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.

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