Collapse of a Degenerate Fermi Gas

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Science  27 Sep 2002:
Vol. 297, Issue 5590, pp. 2240-2243
DOI: 10.1126/science.1077386

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A degenerate gas of identical fermions is brought to collapse by the interaction with a Bose-Einstein condensate. We used an atomic mixture of fermionic potassium-40 and bosonic rubidium-87, in which the strong interspecies attraction leads to an instability above a critical number of particles. The observed phenomenon suggests a direction for manipulating fermion-fermion interactions on the route to superfluidity.

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