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Sökning: WFRF:(Resnati C)

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1.
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2.
  • Desiraju, Gautam R., et al. (författare)
  • Definition of the halogen bond (IUPAC Recommendations 2013)
  • 2013
  • Ingår i: Pure and Applied Chemistry. - 0033-4545 .- 1365-3075. ; 85:8, s. 1711-1713
  • Tidskriftsartikel (refereegranskat)abstract
    • This recommendation proposes a definition for the term "halogen bond", which designates a specific subset of the inter- and intramolecular interactions involving a halogen atom in a molecular entity.
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3.
  • Pfeiffer, D., et al. (författare)
  • First measurements with new high-resolution gadolinium-GEM neutron detectors
  • 2016
  • Ingår i: Journal of Instrumentation. - : IOP PUBLISHING LTD. - 1748-0221. ; 11
  • Tidskriftsartikel (refereegranskat)abstract
    • European Spallation Source instruments like the macromolecular diffractometer (NMX) require an excellent neutron detection efficiency, high-rate capabilities, time resolution, and an unprecedented spatial resolution in the order of a few hundred micrometers over a wide angular range of the incoming neutrons. For these instruments solid converters in combination with Micro Pattern Gaseous Detectors (MPGDs) are a promising option. A GEM detector with gadolinium converter was tested on a cold neutron beam at the IFE research reactor in Norway. The mu TPC analysis, proven to improve the spatial resolution in the case of B-10 converters, is extended to gadolinium based detectors. For the first time, a Gd-GEM was successfully operated to detect neutrons with a measured efficiency of 11.8% at a wavelength of 2 angstrom and a position resolution better than 250 mu m.
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4.
  • Thuiner, P., et al. (författare)
  • Multi-GEM detectors in high particle fluxes
  • 2018
  • Ingår i: EPJ Web of Conferences. - : EDP Sciences. - 2101-6275 .- 2100-014X. ; 174
  • Tidskriftsartikel (refereegranskat)abstract
    • Gaseous Electron Multipliers (GEM) are well known for stable operation at high particle fluxes. We present a study of the intrinsic limits of GEM detectors when exposed to veiy high particle fluxes of the order of MHz/mm2. We give an interpretation to the variations of the effective gain, which, as a function of the particle flux, first increases and then decreases. Wre also discuss the reduction of the ion back-flow with increasing flux. We present measurements and simulations of a triple GEM detector, describing its behaviour in terms of accumulation of positive ions that results in changes of the transfer fields and the amplification fields. The behaviour is expected to be common to all multi-stage amplification devices where the efficiency of transferring the electrons from one stage to the next one is not 100%.
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  • Resultat 1-4 av 4

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