Small-Momentum-Transfer Structure Factor of Quantum Liquids

The liquid structure factor of ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ has been determined in the momentum-transfer range 0.2 to 1.0 ${\mathrm{\AA }}^{-1\mathrm{}}$. At temperatures near 0.4 K there is evidence for a gentle change of slope of the structure factor in the region near 0.35 ${\mathrm{\AA }}^{-1\mathrm{}}$ Comparison with the work on helium-4 suggests that the observed behavior is a general feature of the two fluids.