Preliminary measurements of Andreev reflection of quasiparticles by turbulence in superfluid He-3

We present preliminary measurements of Andreev scattering of quasiparticles from turbulence in the B-phase of superfluid He-3-B. The turbulence is gen erated by a vibrating wire resonator driven above its pair-breaking critica l velocity. The vortices intercept a beam of quasiparticles generated by a nearby black-body radiator. A substantial fraction of the incident quasipar ticles are retro-reflected back into the radiator by Andreev scattering pro cesses. The resulting temperature rise within the radiator provides a direc t measurement of the flux of quasiparticles Andreev reflected. The techniqu e provides a sensitive probe of superfluid turbulence in the ultra-low temp erature regime.