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X-ray-induced quenching of the ²²⁹Th clock isomer in CaF₂
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X-ray-induced quenching of the ²²⁹Th clock isomer in CaF₂
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Thorium-229 has the lowest nuclear-excited state (an isomer state) at approximately 8.356 eV, making it excitable with tabletop vacuum-ultraviolet lasers. Despite the recent success of laser excitation, the isomer quenching inside the solid-state environment remains unresolved. In this letter, we present experiments investigating X-ray-induced isomer quenching in the CaF$_2$ host, focusing on the effects of X-ray flux and temperature on the lifetime and yield of the isomer state. Our studies reveal a correlation between isomer production, isomer lifetime during irradiation, and post-irradiation afterglow of the target crystal across different temperatures, highlighting a strong relationship between isomer quenching and color-center dynamics. We developed a model to interpret the isomer quenching and the crystal's luminescence.
Forward citations
Cited by 2 Pith papers
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A nuclear clock based on $^{229}$Th
First demonstration of a solid-state ²²⁹Th nuclear clock with laser locking to the nuclear transition yielding 2×10^{-12} fractional instability and 10^{-13} reproducibility between crystals.
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Ab initio calculations of $^{229}$Th band-to-band internal conversion rate in $^{229}$ThO$_2$
Ab initio FP-LAPW calculations give 229ThO2 band-to-band internal-conversion lifetimes of 1–16 μs that rise sharply as the host band gap approaches the 8.35 eV nuclear energy and match the measured Mössbauer lifetime ...
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