  We report high resolution Compton scattering measurements on an
Al$_{97}$Li$_3$ disordered alloy single crystal for momentum transfer along the
[100], [110] and [111] symmetry directions. The results are interpreted via
corresponding KKR-CPA (Korringa-Kohn-Rostoker coherent potential approximation)
first principles computations. By comparing spectra for Al$_{97}$Li$_3$ and Al,
we show that the momentum density in the alloy differs significantly from the
predictions of the conventional Fermi liquid picture and that the ground state
of Al is modified anomalously by the addition of Li.
