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Observation of Fermi pressure in a gas of trapped atoms

Hulet graph

[Historical report created from Science submission:]

"We report the attainment of simultaneous quantum degeneracy in a mixed gas of bosons (lithium-7) and fermions (lithium-6). The Fermi gas has been cooled to a temperature of 0.25 times the Fermi temperature by thermal collisions with the evaporatively cooled bosons. At this temperature, the spatial size of the gas is strongly affected by the Fermi pressure resulting from the Pauli exclusion principle and gives clear experimental evidence for quantum degeneracy."

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[Receive by Science 25 January 2001]
Science, Vol 291, Issue 5513, 2570-2572, 30 March 2001