Generalized Van Hove Formula for Scattering of Neutrons .pdf

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Title: GENERALIZED VAN HOVE FORMULA FOR SCATTERING OF NEUTRONS BY THE NONEQUILIBRIUM STATISTICAL MEDIUM
Author: A.L. Kuzemsky

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GENERALIZED VAN HOVE FORMULA FOR SCATTERING OF N...

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http://www.worldscientific.com/doi/abs/10.1142/S0217979212500920

19.07.2012 17:44

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http://adsabs.harvard.edu/abs/2012IJMPB..2650092K

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Generalized Van Hove Formula for Scattering of
Neutrons by the Nonequilibrium Statistical
Medium
Kuzemsky, A. L.
International Journal of Modern Physics B, Volume 26, Issue 13, id. 1250092-1-1250092-34
The theory of scattering of particles (e.g., neutrons) by statistical medium was recast for the
nonequilibrium statistical medium. The correlation scattering function of the relevant
variables give rise to a very compact and entirely general expression for the scattering crosssection of interest. The formula obtained by Van Hove provides a convenient method of
analyzing the properties of slow neutron and light scattering by systems of particles such as
gas, liquid or solid in the equilibrium state. In this paper the theory of scattering of particles
by many-body system was reformulated and generalized for the case of nonequilibrium
statistical medium. A new method of quantum-statistical derivation for the space and time
Fourier transforms of the Van Hove correlation function was formulated. Thus in place of the
usual Van Hove scattering function, a generalized one was deduced and the result was shown
to be of greater potential utility than those previously given in the literature. This expression
gives a natural extension of the familiar Van Hove formula for scattering of slow neutrons for
the case in which the system under consideration is in a nonequilibrium state. The feasibility
of light- and neutron-scattering experiments to investigate the appropriate problems in real
physical systems was discussed briefly.
Keywords: Dynamical properties of condensed matter, slow neutron scattering in solids and fluids,
correlations over space and time, scattering cross-section, light- and neutron-scattering experiments, Van
Hove scattering function, method of the nonequilibrium statistical operator, quantum evolution, entropy
production
DOI: 10.1142/S0217979212500920
The ADS is Operated by the Smithsonian Astrophysical Observatory under NASA Grant
NNX09AB39G

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