Superfluidity of helium-4 in vycor and helium-3 in aerogel

Two separate sets of experiments have been performed looking at different aspects of superfluid helium in the presence of porous material. In the first, a high stability, high resolution torsional oscillator was used to measure 4He in vycor glass. Superfluid transitions were measured as a function of temperature and density. The data were compared to theories of weakly interacting bose gases. The second set of experiments consisted of a simultaneous measurement of heat capacity and superfluid density (using a torsional oscillator) in 3He in aerogel glass. These were the first experiments to establish the presence of a heat capacity anomaly coincident with the superfluid transition of 3He in aerogel. Quantitative analysis suggests the specific heat anomaly is of a BCS form.