Density dependence of transition temperature of He-4 films in vycor glass

We present recent high resolution data on He-4 films in vycor glass. Vycor is a unique system in that the interconnectedness of the glass and the smal l size of the pores leads to the presence of 3DXY universality in thin film s on the vycor. This allows us effectively to look at the 3D behavior of He -4 over a large range of densities by varying the coverage in the glass. Ra nging in super fluid particle densities 6 from 6 x 10(18) per cm(3) to 1.5 x 10(21) per cm3, these data show the crossover from weakly interacting BEC like behavior do that of a strongly interacting bose gas. Additionally, fr om the lowest coverages, an effective mass can be determined. A future cell is being designed which will allow access to densities approaching 1 x 10( 18) per cm(3).