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Focusing and polarized neutron small‐angle scattering spectrometer (SANS‐J‐II). The challenge of observation over length scales from an ångström to a micrometre
Author(s) -
Koizumi Satoshi,
Iwase Hiroki,
Suzuki Junichi,
Oku Takayuki,
Motokawa Ryuhei,
Sasao Hajime,
Tanaka Hirokazu,
Yamaguchi Daisuke,
Shimizu Hirohiko M.,
Hashimoto Takeji
Publication year - 2007
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889807014392
Subject(s) - spectrometer , small angle neutron scattering , optics , scattering , neutron scattering , small angle scattering , physics , neutron , resolution (logic) , pinhole (optics) , crystal (programming language) , nuclear physics , artificial intelligence , computer science , programming language
SANS‐J (a pinhole small‐angle neutron scattering spectrometer at research reactor JRR3, Tokai, Japan) was reconstructed as a focusing and polarized neutron small‐angle scattering spectrometer (SANS‐J‐II). By employing focusing lenses of a biconcave MgF 2 crystal or of a sextupole permanent magnet and a high‐resolution photomultiplier, the minimum accessible magnitude of the scattering vector q min was improved from 3 × 10 −3 Å −1 to an ultra‐small‐angle scattering (USAS) of 3 × 10 −4 Å −1 . Compared with a Bonse–Hart double‐crystal method, the advantages of focusing USAS are the efficient detection of anisotropic USAS with an area detector, an improvement in q resolution Δ q / q at conventional magnitudes of the scattering vector q ~ 10 −3 Å −1 and a gain in neutron flux in the conventional q region of q ~ 10 −3 Å −1 .