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APS » Journals » Phys. Rev. Lett. » Volume 102 » Issue 14
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Phys. Rev. Lett. 102, 140401 (2009) [4 pages]

Evidence for Universal Four-Body States Tied to an Efimov Trimer

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F. Ferlaino1, S. Knoop1, M. Berninger1, W. Harm1, J. P. D’Incao2,3, H.-C. Nägerl1, and R. Grimm1,2
1Institut für Experimentalphysik and Zentrum für Quantenphysik, Universität Innsbruck, 6020 Innsbruck, Austria
2Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, 6020 Innsbruck, Austria
3JILA, University of Colorado and NIST, Boulder, Colorado 80309-0440, USA

Received 6 March 2009; published 6 April 2009

See accompanying Physics Viewpoint

We report on the measurement of four-body recombination rate coefficients in an atomic gas. Our results obtained with an ultracold sample of cesium atoms at negative scattering lengths show a resonant enhancement of losses and provide strong evidence for the existence of a pair of four-body states, which is strictly connected to Efimov trimers via universal relations. Our findings confirm recent theoretical predictions and demonstrate the enrichment of the Efimov scenario when a fourth particle is added to the generic three-body problem.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.140401
DOI:
10.1103/PhysRevLett.102.140401
PACS:
03.75.−b, 21.45.−v, 34.50.Cx, 67.85.−d
 
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