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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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.