A MICROSCOPIC STUDY OF THE DYNAMICS OF DILUTE HE-3-HE-4 MIXTURES

We study microscopically the dynamical response S(q, w) to inelastic n eutron scattering of dilute mixtures of liquid He-3 in He-4 at T = 0, at momentum transfers up to q similar to 2 Angstrom(-1). Short range c orrelations are implemented by Correlated Basis Function theory. The t otal response is in semiquantitative agreement with recent experiments . In addition, the theory is used to evaluate the He-3 single particle energy in the zero concentration limit, showing a clear deviation fro m the quadratic Landau-Pomeranchuck parametrization.