Document Type

Article

Publication Date

Summer 8-28-2000

Publication Title

Physical Review Letters

ISSN

0031-9007

Volume

85

Issue

9

First Page

1795

Last Page

1798

DOI

10.1103/PhysRevLett.85.1795

Abstract

Bose-Einstein condensation has been achieved in a magnetically trapped sample of 85Rb atoms. Long-lived condensates of up to 104 atoms have been produced by using a magnetic-field-induced Feshbach resonance to reverse the sign of the scattering length. This system provides new opportunities for the study of condensate physics. The variation of the scattering length near the resonance has been used to magnetically tune the condensate self-interaction energy over a wide range, extending from strong repulsive to large attractive interactions. When the interactions were switched from repulsive to attractive, the condensate shrank to below our resolution limit, and after ∼5ms emitted a burst of high-energy atoms.

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