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X-ray-induced quenching of the ²²⁹Th clock isomer in CaF₂

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arxiv 2505.03852 v2 pith:EUT4IMZ5 submitted 2025-05-06 cond-mat.mtrl-sci nucl-ex

X-ray-induced quenching of the ²²⁹Th clock isomer in CaF₂

classification cond-mat.mtrl-sci nucl-ex
keywords isomerquenchingstatecrystallifetimex-ray-inducedacrossafterglow
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. A nuclear clock based on $^{229}$Th

    physics.atom-ph 2026-06 unverdicted novelty 7.0

    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.