Abstract
Liquid sodium has been studied at small momentum transfers by the neutron scattering method. The temperature was near the melting point. Two different neutron energies were used (3.34 and 47.7 meV with approximate resolutions of 0.16 and 1.5 meV respectively) to measure the dynamic scattering function for momentum transfer from 0.3 to 1.8 AA-1. The observed region of energy transfers covers a range from 4 to 18 meV. The zeroth and second moments of the scattering function are determined and are compared with an independent diffraction experiment and an exact theoretical value, respectively. A comparison is made with the results from an approximate molecular dynamics simulation solely made to create an input kernel for the multiple scattering correction. The width of the scattering function is also obtained and its general feature is compared with theoretical results on other substances. An effective frequency distribution of the velocity autocorrelation function is determined and discussed.
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