  For the first time, an experimental determination of the single-particle mean
kinetic energies for 3He along the T=2.00 K isotherm in the dense liquid and in
the solid hcp and bcc phases is reported. Deep Inelastic Neutron Scattering
measurements at exchanged wavevectors ranging from 90.0 A^-1 to 140.0 A^-1 have
been performed in order to evaluate, within the framework of the Impulse
Approximation, the molar volume dependence of the kinetic energy. The results
are found in excellent agreement with recent Diffusion Monte Carlo simulations.
