Neutron Inelastic Scattering from Liquid 3He

In two recent publications1,2 we have reported on the results of neutron inelastic scattering studies of liquid helium-3 at 15 mK. These results are summarized in the present paper which also contains some additional data obtained at smaller wave-vectors.3 It is shown that for q ≲ 1.4 A-1 the zero-sound mode and the spin fluctuation spectrum are observed as separate peaks in the scattering function. For q ≳ 2 A-1 we obtain strong evidence for sharp two-phonon scattering at approximately twice the energy of the flat portion of the zero-sound dispersion curve.