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On the sensitivity of nuclear clocks to new physics
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abstract
The recent demonstration of laser excitation of the $\approx 8$ eV isomeric state of Thorium-229 is a significant step towards a nuclear clock. The low excitation energy likely results from a cancellation between electromagnetic and strong contributions, which new physics can disrupt. In this Letter, we quantify the enhancement of a nuclear clock's sensitivity to new physics using a geometric model and a novel $d$-wave halo model of the nucleus that reproduces measured differences between Thorium-229 states. We find likely enhancements of order $10^4$ while a worst case scenario with enhancement $\ll 1$ is unlikely.
Forward citations
Cited by 3 Pith papers
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Laser-Induced Quenching of the Th-229 Nuclear Clock Isomer in Calcium Fluoride
Laser light quenches the 229Th isomer in CaF2, shortening its lifetime threefold at room temperature; the effect is wavelength-independent below 420 nm, temperature-activated, and absent above 729 nm.
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Frequency reproducibility of solid-state Th-229 nuclear clocks
The 229Th:CaF2 nuclear clock transition frequency is reproducible to 280 Hz (1.4e-13) between two differently doped crystals over four months at the zero-shift temperature of 195 K.
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