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Storage-ring laser spectroscopy of accelerator-produced hydrogen-like <sup>208</sup>Bi<sup>82+</sup>

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Nature Physics, Published online: 28 April 2025; doi:10.1038/s41567-025-02885-x

Hyperfine splitting was measured using the laser spectroscopy of accelerator-produced hydrogen-like bismuth ions. This demonstrates the feasibility of such measurements with other exotic ions with low production yields in a storage ring.