Low-Energy Neutron Physics

Small-angle scattering studies of phase separation and defects in inorganic materials

“…Detailed examination (see e.g. Gurevich & Tarasov, 1968) of this interaction shows that of the magnetic scattering amplitude M(Q) related to the Fourier transform of the magnetization density M(r), only the component M ±(Q) perpendicular to the scattering vector Q contributes to any scattering. Just as for the nuclear scattering in the small-angle-scattering region, where the scattering amplitude of the system, F(Q), is obtained by integrating over the locally averaged scatteringlength density p(r), (6) with Po = 2.7 x 10-]5 m. The magnetic form factor of the individual moments (normally due to unpaired spins) has been omitted as it is close to one in the SANS region.…”

A time-of-flight neutron diffraction study of anharmonic thermal vibrations in SrF2, at the spallation neutron source ISIS

“…The anharmonic features are most evident in reflections obtained with short-wavelength neutrons and for these reflections it is reasonable to make the incoherent approximation. A detailed discussion of the relative magnitudes of the n-phonon cross sections as a function of specimen temperature and incident neutron energy is given by Gurevich & Tarasov (1968).…”

Computation Vibration Spectroscopy as a Tool for Investigation of Complicated Systems

“…INS spectra intensity calculation is performed basing on the a little bit simplified formula 4.1.56 from [34]. Since we integrate the scattering data over all angles and calculate only relative intensities we are able to neglect absolute scattering factors and angle dependency.…”