Propagation of thermal excitations in a cluster of vortices in   superfluid 3He-B
  We describe the first measurement on Andreev scattering of thermal excitations from a vortex configuration with known density, spatial extent, and orientations in 3He-B superfluid. The heat flow from a blackbody radiator in equilibrium rotation at constant angular velocity is measured with two quartz tuning fork oscillators. One oscillator creates a controllable density of excitations at 0.2Tc base temperature and the other records the thermal response. The results are compared to numerical calculations of ballistic propagation of thermal quasiparticles through a cluster of rectilinear vortices. 
J.J. Hosio, V.B. Eltsov, R. de Graaf, M. Krusius, J. M\"akinen, and D.   Schmoranzer
cond-mat.other cond-mat.supr-con