Distribution of 3He-4He Mixtures in a Bi-Porous System

We have investigated the distribution of 3He-4He mixtures in a system comprised of two porous materials: aerogel and silver sinter. The particle number density, and thus the 3He-4He concentration, was measured directly in the aerogel sample. We discuss both the observed history dependence for the low temperature equilibrium 4He fraction in aerogel and the temperature evolution of the 4He fraction.