Abstract
Extensive neutron scattering data on liquid helium 4 are available, and have been analyzed to give a number of physical quantities, e.g. static structure factor S(q), excitation energy, and roton linewidth. X-rays also give access to S(q). However, a comprehensive comparison between experimental data and theoretical results, including their dependence on pressure, is still lacking. The static response function χ(q) has been particularly overlooked, despite its fundamental role in theories of inhomogeneous helium. We present here a critical review about the strength of the main peaks of S(q) and χ(q). We include in the comparison the analysis of unpublished neutron data and new Monte-Carlo calculations of χ(q). We find a significant discrepancy between experiments, and suggest corrections which account for some of the differences. We give recommendations for the best values to use for S(q) and χ(q).
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Caupin, F., Boronat, J. & Andersen, K.H. Static Structure Factor and Static Response Function of Superfluid Helium 4: a Comparative Analysis. J Low Temp Phys 152, 108–121 (2008). https://doi.org/10.1007/s10909-008-9809-3
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DOI: https://doi.org/10.1007/s10909-008-9809-3