Hydrodynamic behavior in expanding thermal clouds of Rb-87

Details Hydrodynamic behavior in expanding thermal clouds of Rb-87 Hydrodynamic behavior in expanding thermal clouds of Rb-87

2003-08-25

arxiv.org/abs/cond-mat/0308493v1

Physics

Condensed Matter

7 pages with 2 figures

Scientific paper

10.1103/PhysRevA.68.063603

We study hydrodynamic behavior in expanding thermal clouds of Rb-87 released from an elongated trap. At our highest densities the mean free path is smaller than the radial size of the cloud. After release the clouds expand anisotropically. The cloud temperature drops by as much as 30%. This is attributed to isentropic cooling during the early stages of the expansion. We present an analytical model to describe the expansion and to estimate the cooling. Important consequences for time-of-flight thermometry are discussed.

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