CONCENTRATION-DEPENDENCE OF THE EFFECTIVE-MASS OF HE-3 ATOMS IN HE-3-HE-4 MIXTURES

Recent measurements by Yorozu et al. [S. Yorozu, H. Fukuyama, and H. I shimoto, Phys. Rev. B 48, 9660 (1993)] as well as by Simons and Muelle r [R. Simons and R.M. Mueller, Czech. J. Phys. Suppl. 46, 201 (1996)] have determined the effective mass of He-3 atoms in a He-3-He-4 mixtur e with great accuracy. We here report theoretical calculations for the dependence of that effective mass on the He-3 concentration. Using co rrelated basis function perturbation theory to infinite order to compu te effective interactions in the appropriate channels, we obtain good agreement between theory and experiment.