Abstract
We determine by neutron diffraction the static structure factorS(q) of fluid helium at 4 K and 8 K at number densityn = 19.5 nm−3 for wavenumbers 0.5 < q < 7 nm−1.S(q) decreases very rapidly from its thermodynamic valueS(0) atq = 0 to aboutS(0)/2 atq ≃ 5 nm−1 confirming the behavior seen in X-ray diffraction experiments. We combine the experimental data with previous larger-q results and compare them with classical model calculations that indicate long range correlations ∼ 1/r 4 between the helium particles. By means of computer simulations we show that the structure is incompatible with any Lennard-Jones interaction.
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Crevecoeur, R.M., Smorenburg, H.E. & de Schepper, I.M. Structure of helium at 4 and 8 K from neutron diffraction. J Low Temp Phys 103, 313–330 (1996). https://doi.org/10.1007/BF00754792
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DOI: https://doi.org/10.1007/BF00754792