Development of an Atom Counting System to Measure Ultralow ^85Kr Contamination in Liquid Xenon Dark Matter Detectors

Details Development of an Atom Counting System to Measure Ultralow ^85Kr Contamination in Liquid Xenon Dark Matter Detectors Development of an Atom Counting System to Measure Ultralow ^85Kr Contamination in Liquid Xenon Dark Matter Detectors

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aps..dmp.e1109z&link_type=abstract

American Physical Society, 41st Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics Volume 55, Number 5,

Physics

Scientific paper

Weakly Interacting Massive Particles (WIMPs) may constitute the dark matter that makes up 25% of our universe. Various WIMP detection methods are currently pursued; the XENON experiment expects to detect low energy nuclear recoils in liquid xenon due to dark matter interactions. An experiment with a ton scale Xe target is projected to be sensitive to a spin-independent WIMP-nucleon collision cross section of 10-47 cm^2. To achieve this high sensitivity, background events from inherent radioactivity of the target must be suppressed, particularly the beta-decay of the ^85Kr rare isotope. The tolerable contamination by all Kr isotopes is below a part per trillion. To quantitatively measure the Kr contamination of Xe, we are constructing a single atom counting apparatus that relies on laser cooling and trapping of metastable Kr. The detection of ultralow atom numbers is made possible by the excellent spatial selectivity of the magneto-optical trap and efficient fluorescence collection on the strong cycling transition of Kr.

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