A laser excites a low energy isomeric state in a nucleus of thorium-229 embedded in a crystal of calcium fluoride. Selected for a Viewpoint in Physics and an Editors’ Suggestion.

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Laser Excitation of the Th-229 Nucleus
J. Tiedau, M. V. Okhapkin, K. Zhang, J. Thielking, G. Zitzer, E. Peik, F. Schaden, T. Pronebner, I. Morawetz, L. Toscani De Col, F. Schneider, A. Leitner, M. Pressler, G. A. Kazakov, K. Beeks, T. Sikorsky, and T. Schumm
Phys. Rev. Lett. 132, 182501 (2024)

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