Bethe strings observed in ultracold atoms

Researchers from the University of Innsbruck have successfully observed Bethe strings in ultracold atoms, nearly a century after their prediction by Hans Bethe. This experiment utilized a cloud of caesium atoms cooled to near absolute zero, allowing for precise control of atomic interactions. The study demonstrated that these multi-particle states can collide without breaking apart, providing a clear signature of their existence. The findings contribute to the understanding of quantum many-body states.

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