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      https://www.ias.ac.in/article/fulltext/pram/071/05/1171-1175

    • Keywords

       

      Neutron collimation; sub-arcsec collimation; Bragg prism; super ultra-small angle neutron scattering; dynamical diffraction.

    • Abstract

       

      We have designed, fabricated and operated a novel Bragg prism monochromator–analyser combination. With a judicious choice of the Bragg reflection, its asymmetry and the apex angle of the silicon single crystal prism, the monochromator has produced a neutron beam with sub-arcsec collimation. A Bragg prism analyser with the opposite asymmetry has been tailored to accept a still sharper angular profile. With this optimized monochromator–analyser pair, we have attained the narrowest and sharpest neutron angular profile to date. At this facility, we have recorded the first SUSANS spectra spanning wave vector transfers $Q \sim 10^{−6}$ Å-1 to characterize samples containing agglomerates up to tens of micrometres in size.

    • Author Affiliations

       

      Apoorva G Wagh1 Sohrab Abbas1 Markus Strobl2 Wolfgang Treimer2

      1. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
      2. Hahn-Meitner-Institut, Glienicker Strasse 100, D-14 14109 Berlin, Germany
    • Dates

       
  • Pramana – Journal of Physics | News

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