It's about time someone nailed down the nuclear clock
Briefly

The culmination of three decades of research has shown for the first time that it's possible to couple an atomic nucleus to an atomic clock, allowing comparisons in timekeeping frequencies.
This work is a significant advancement, potentially leading to a new generation of ultra-precise clocks based on nuclear physics, which could greatly enhance our understanding of the fundamental constants of the universe.
The newly developed frequency 'comb' is crucial, as it allows for the precise transitions between energy states in atomic nuclei, marking a major step in nuclear-based timekeeping.
Read at Theregister
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