Document Type

Article

Publication Date

Summer 7-24-2000

Publication Title

Physical Review Letters

ISSN

0031-9007

Volume

85

Issue

4

First Page

728

Last Page

731

DOI

10.1103/PhysRevLett.85.728

Abstract

nelastic collision rates for ultracold 85Rb atoms in the F=2, mf=−2 state have been measured as a function of magnetic field. At 250 gauss (G), the two- and three-body loss rates were measured to be K2=(1.87±0.95±0.19)×10−14cm3/s and K3=(4.24+0.70−0.29±0.85)×10−25cm6/s, respectively. As the magnetic field is decreased from 250 G towards a Feshbach resonance at 155 G, the inelastic rates decrease to a minimum and then increase dramatically, peaking at the Feshbach resonance. Both two- and three-body losses are important, and individual contributions have been compared with theory.

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