Focusing and polarized neutron ultra-small-angle scattering spectrometer (SANS-J-II) at Research Reactor JRR3, Japan

By employing focusing lenses of sextupole permanent magnet and biconcave MgF2 crystal, and high-resolution photomultiplier, SANS-J (pinhole small-angle neutron scattering spectrometer at research reactor JRR3, Tokai) was reconstructed to focusing and polarized neutron ultra-small-angle scattering spectrometer (SANS-J-II). Consequently, an accessible minimum wave number q(min) was improved from 3 x 10(-3) angstrom(-1) to 3 x 10(-4) angstrom(-1). Furthermore, we added He-3 sub-detectors with an analyzer super mirror at a sample position. With this setup, we perform polarization analysis at high q (> U angstrom(-1)) in order to quantitatively discriminate spin incoherent scattering from hydrogen or to perform spin contrast variation, by a dynamic nuclear polarization method (> 0.2 angstrom(-1)) (c) 2006 Elsevier B.V. All rights reserved.