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11. Neutron Diffraction Study of Quantum Effects on the Pair Correlation

Author

Guarini E., Barocchi F., Celli M., Fischer H. E., Magli R., and Zoppi M.

Abstract

An extensive neutron diffraction investigation on low-density (n < 4.35 nm-3) states of helium gas along the 6-K isotherm has been performed by means of both wide and small-angle experiments, allowing for the extraction of the zero- and first-order density coefficients of c(k), the Fourier transform of the direct correlation function, in a very wide wavevector region extending from k = 1 nm-1 to k = 160 nm-1. The two independent measurements provide quantitatively consistent results, and the experimental quantities show a good agreement with the thermodynamic (i.e. k = 0) data. The comparison of the experimental pure two-body correlation with the corresponding result of a classical calculation clearly indicates the need of a quantum-mechanical approach.

Published
2002

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