Abstract
The quantum evaporation experiments of Brown and Wyatt 2 have been re-analysed in the light of a recent measurement of the high-energy phonon spectrum created by a pulse-heated thin film 10 . Two sources of systematic error become significant at the level of the precision required by this new analysis: firstly, in the detector position which is recalibrated by using large-angle roton evaporation; and secondly, in the liquid height due to capillary action affecting the level-detectors. These effects have been included in an improved simulation of the experiment which has brought the angular dependence of the measured and theoretical phonon-atom evaporation results into agreement within the mechanical tolerances of the apparatus. The reanalysis suggests that the roton-atom evaporation probability increases with wave vector.
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Williams, C. Quantum Evaporation from Superfluid 4He. Journal of Low Temperature Physics 113, 11–18 (1998). https://doi.org/10.1023/A:1022576619646
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DOI: https://doi.org/10.1023/A:1022576619646