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Title: Determination of the separation efficiencies of a single-stage cryogenic distillation setup to remove krypton out of xenon by using a {sup 83m}Kr tracer method

The separation of krypton and xenon is of particular importance for the field of direct dark matter search with liquid xenon detectors. The intrinsic contamination of the xenon with radioactive {sup 85}Kr makes a significant background for these kinds of low count-rate experiments and has to be removed beforehand. This can be achieved by cryogenic distillation, a technique widely used in industry, using the different vapor pressures of krypton and xenon. In this paper, we present an investigation on the separation performance of a single stage distillation system using a radioactive {sup 83m}Kr-tracer method. The separation characteristics under different operation conditions are determined for very low concentrations of krypton in xenon at the level of {sup 83m}Kr/Xe = 1.9 ⋅ 10{sup −15}, demonstrating, that cryogenic distillation in this regime is working. The observed separation is in agreement with the expectation from the different volatilities of krypton and xenon. This cryogenic distillation station is the first step on the way to a multi-stage cryogenic distillation column for the next generation of direct dark matter experiment XENON1T.
Authors:
; ; ; ; ;  [1] ;  [2] ;  [3]
  1. Institut für Kernphysik, Wilhelm-Klemm Straße 09, 48149 Münster (Germany)
  2. Karlsruher Institut für Technologie, Hermann Von Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen (Germany)
  3. Nuclear Physics Institute, Czech Academy of Sciences, CZ 250 68 Řež (Czech Republic)
Publication Date:
OSTI Identifier:
22482615
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 86; Journal Issue: 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ABUNDANCE; CONTAMINATION; COUNTING RATES; DISTILLATION; DISTILLATION EQUIPMENT; EFFICIENCY; KRYPTON; KRYPTON 83; KRYPTON 85; LIQUIDS; NONLUMINOUS MATTER; PERFORMANCE; VAPOR PRESSURE; VOLATILITY; XENON