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Recent neutron scattering measurements on the quantum liquids "*He and 3 He are described. In the Bose superfluid there is a well-defined excitation for wave vectors less than 3.6 A"" 1 . In the Fermi liquid measurements are much more difficult because of the large absorption cross section, but measurements at the Institute Laue-Langevin have shown that there are no well-defined excitations at 0.63 K for wave vectors between 1.0 and 2.6 l~l. The difference between these results is due to thedoi:10.1016/b978-0-444-85117-8.50006-4 fatcat:kltbohlvurhvvfjrmfhytjlzy4