Direct observation of the Andreev reflection of a quasiparticle beam by quantum turbulence in superfluid He-3-B

摘要

A beam of quasiparticles from a black-body radiator is directed at a localized region of quantum turbulence generated by a vibrating wire resonator driven at super-critical velocity. We are able to measure directly the fraction of the incident quasiparticle beam which is retro-reflected from the turbulence by Andreev processes. Combining these measurements with previous measurements on the spatial extent of the turbulence may allow us to infer the vortex line density. (C) 2003 Elsevier Science B.V. All rights reserved. [References: 3]