Abstract
Neutron inelastic scattering from normal liquid $^{4}\mathrm{He}$ at $T=3.1$ K and wave vectors in the region $0.2l~\ensuremath{\kappa}l~2.2$ ${\mathrm{\AA{}}}^{\ensuremath{-}1}$ reveals the existence of propagating collective excitations, as measured by peaks at finite energies in the dynamical structure factor $S(\ensuremath{\kappa}, \ensuremath{\omega})$. The spectra are in some respects similar to spectra of the superfluid liquid. The relation to other normal liquids, in particular to Rb and Ar, is discussed.
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