TEMPERATURE-DEPENDENCE OF SPIN-DENSITY FLUCTUATIONS IN LIQUID-HE-3

The dynamic structure factor S(Q,E) in normal liquid He-3, which conta ins information on both density and spin-density fluctuations, has bee n measured by inelastic neutron scattering both well below and close t o the Fermi temperature. The data extend to smaller wave vectors and e nergies than covered in earlier experiments, and give a much better de termination of the line shape of the spin-density response. Together w ith the temperature dependence, this allows to discriminate between di fferent theoretical models for the nuclear spin fluctuations, and prov ides information on the quasiparticle dispersion and effective mass.