Quantum mechanics predicts an infinite series of loosely bound states of three bosons, and the size of these trimers should scale with a factor of 22.7. This general result seems to be confirmed now in an experiment with an ultracold gas of potassium atoms.
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Efimov, V. Giant trimers true to scale. Nature Phys 5, 533–534 (2009). https://doi.org/10.1038/nphys1355
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DOI: https://doi.org/10.1038/nphys1355
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