Quantum evaporation from superfluid 4He

被引:13
作者
Williams, CDH [1 ]
机构
[1] Univ Exeter, Sch Phys, Exeter EX4 4QL, Devon, England
关键词
D O I
10.1023/A:1022576619646
中图分类号
O59 [应用物理学];
学科分类号
摘要
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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页码:11 / 18
页数:8
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