Hanns-Christoph Nägerl

Quantum physicist who led the Innsbruck experiment

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Bethe strings, predicted in 1931, created in ultracold cesium gas

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Active at the University of Innsbruck

A quantum state predicted in 1931 now exists in a laboratory. Physicists in Innsbruck cooled cesium atoms near absolute zero, squeezed them into thousands of one-dimensional tubes, and watched them bind into clusters called Bethe strings.

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