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Czechoslovak Journal of Physics

Unitarity, time reversal and quantum evaporation from liquid helium

F. Dalfovo, Лев П. Питаевский, S. Stringari

Published Jan 1, 1996• 5 citations
Publisher
DOI
10.1007/bf02569611

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The kinetic theory of evaporative cooling developed by Luiten et al. [Phys. Rev. A 53, 381 (1996)] is extended to include the dependence of the elastic scattering cross section on collision energy. We introduce a simple approximation by which the transition range between the low-temperature limit and the unitarity limit is described as well. Applying the modified theory to our measurements on evaporative cooling of metastable helium, we find a scattering length $\ensuremath{\mid}a\ensuremath{\mid}=10(5)\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$.