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The ratio of the static matter structure factor measured in experiments oncoherent X-ray scattering to the static structure factor measured inexperiments on neutron scattering is considered. It is shown theoretically thatthis ratio in the long-wavelength limit is equal to the nucleus charge atarbitrary thermodynamic parameters of a pure substance (the system of nucleiand electrons, where interaction between particles is pure Coulomb) in adisordered equilibrium state. This result is the exact relation of the quantumstatistical mechanics. The experimental verification of this relation can bedone in the long wavelength X-ray and neutron experiments.

Exact limiting relation between the structure factors in neutron and x-ray scattering