P. Lindner et al., Analysis of water scattering used for calibration of small-angle neutron scattering (SANS) measurements, PHYSICA B, 291(1-2), 2000, pp. 152-158
In a SANS study of critical scattering on CO,, we were faced with the probl
em of achieving highest resolution: a deviation from the Q(-2) power law of
a few percent had to be characterized and critical fluctuations in the siz
e range between 10 and 1000 Angstrom were measured. Experiments were done i
n the broad Q-range available at the instrument D11 at ILL, using several w
avelengths (4.5 less than or equal to lambda (Angstrom) less than or equal
to 10) and sample-to-detector positions (1.7 less than or equal to L (m) le
ss than or equal to 35.7). In this paper we discuss the problem of calibrat
ion using a water sample at different experimental configurations, i.e, sam
ple-to-detector distances and wavelengths. We consider geometric effects an
d the efficiency of the two-dimensional BF3-multidetector, as well as inela
sticity- and multiscattering effects as a function of incident wavelength a
nd water thickness. (C) 2000 Elsevier Science B.V. All rights reserved.