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We describe a measurement of the transmission probability of 4 He atoms through a freely suspended slab of superfluid 4 He at low temperatures. This geometry was treated in a recent theoretical calculation (J. Low Temp. Phys. 113 (1998) 519). In our experiment the slab is realised by using an array of parallel cylindrical holes of diameter 50μm in a glass disc of thickness 200μm. By...
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