Fine-structure constant sensitivity of the Th-229 nuclear clock transition

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Abstract

Nuclear laser spectroscopy at the 10−12 precision level (Nature 633.8028 (2024): 63–70) determined the fractional change in the nuclear quadrupole
moment of 229Th upon excitation, ΔQ0/Q0 = 1.791(2)%. Such high-accuracy nuclear parameters enable stringent tests and refinement of 229Th nuclear
models. Using a semi-classical prolate-spheroid model, we quantify the transition frequency’s sensitivity to fine-structure constant variations as

Year of Publication
2025
Date Published
2025-09
Journal Title
Nature Communications
Volume
16
Start Page or Article ID
9147
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