HYDROGEN ISOTOPE AND HE-3 IMPURITIES IN LIQUID-HE-4

Recently Reynolds, Hayden and Hardy (J. Low Temp. Phys. 84, 87 (1991)) analyzed atomic deuterium lifetimes in a cell with walls covered by a saturated He-4 film. They were able to determine the deuterium chemical potential in He-4 and also discussed the possibility of estimating its effective mass. These measurements inspired our attempt to understand the properties of hydrogen isotope impurities in liquid He-4 using the extended Jastrow-Feenberg theory based on the correlated wave function. We present results for hydrogen isotope chemical potentials in the bulk He-4 as a function of density. The accuracy of the method is tested by calculating the chemical potential of the He-3 impurity. We find a good agreement with existing measurements. We also calculate the effective masses of the hydrogen impurities. For deuterium we predict a value, m(eff) = 4m(D).