Nucleation in dilute He-3-He-4 liquid mixtures at low temperatures

We present a study of phase separation from supersaturated He-3-He-4 liquid mixtures at low temperatures addressing both the degree of critical supers aturation Delta x(cr) and the thermal-to-quantum crossover temperature T* f or the nucleation process. Two different nucleation seeds are investigated, namely He-3 droplets and He-4 vortex lines with cores filled with He-3. We have found that the experimental T* is reproduced when we consider that nu cleation proceeds front (SHe)-S-3 droplets, whereas Delta x(cr) is reproduc ed when we consider He-4 vortex lines filled with He-3. However, neither nu cleation configuration is able to simultaneously reproduce the current expe rimental information on Delta x(cr) and T*.