First measurements of UV and visible photo- and radio-luminescence of thin ThF4 films show background rates low enough that a small, enriched ThF4 film remains a viable 229mTh nuclear clock target.
Yamaguchi, et al., Laser spectroscopy of triply charged 229T h isomer for a nuclear clock, Nature 629 (2024) 62
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Measurement of photo- and radio-luminescence of thin ThF4 films
First measurements of UV and visible photo- and radio-luminescence of thin ThF4 films show background rates low enough that a small, enriched ThF4 film remains a viable 229mTh nuclear clock target.