Nuclear clock closer to reality

Pro Search

3 steps completed
Recent advancements in nuclear clock technology have brought the development of these highly precise timekeeping devices closer to reality. Nuclear clocks, which measure time based on the oscillations of atomic nuclei rather than electron transitions, promise unprecedented accuracy compared to current atomic clocks.

Scandium-45 and Thorium-229: Key Players in Nuclear Clock Development

  1. Scandium-45 Developments:
    • Researchers have made significant progress with scandium-45, a potential candidate for nuclear clocks. Recent studies have successfully excited the scandium-45 nuclear isomer using the world's brightest X-ray pulses at the European XFEL facility. This breakthrough, involving teams from the US Department of Energy’s Argonne National Laboratory and Texas A&M University, among others, has demonstrated the feasibility of using scandium-45 in nuclear clocks due to its relatively long half-life and stable nuclear transitions.
  2. Thorium-229 Developments:
    • Concurrently, advancements have been made with thorium-229. Researchers in Germany and Austria have managed to excite nuclei of thorium-229 into a low-lying metastable state using vacuum ultraviolet light generated by a laser. This development is crucial as thorium-229's low excitation energy makes it a viable candidate for a more stable and practical nuclear clock. The potential for thorium-229 to be used in solid-state devices rather than requiring isolation in traps, as in traditional atomic clocks, marks a significant step forward in the practical application of nuclear clocks.

Challenges and Future Prospects

Despite these advancements, several challenges remain:
  • Technical Challenges: The development of nuclear clocks still faces significant technical hurdles, including the need for high-intensity X-ray sources and low-noise detection systems to accurately measure nuclear transitions.
  • Material and Methodological Issues: Identifying suitable materials like scandium-45 and thorium-229 and developing methods to consistently excite and measure their nuclear states are ongoing challenges. The complexity of controlling and measuring these properties requires further research and innovation.

Implications of Nuclear Clocks

The successful development of nuclear clocks could revolutionize timekeeping by providing stability and precision far beyond that of the best current atomic clocks. This could have profound implications for various fields, including:
  • Science and Technology: Enhanced precision in timekeeping could improve the accuracy of GPS systems, telecommunications, and other technologies reliant on precise timing.
  • Fundamental Physics: Nuclear clocks could aid in testing fundamental physics theories, such as relativity and quantum mechanics, by measuring time variations with extreme accuracy.


The progress in nuclear clock technology, particularly with scandium-45 and thorium-229, represents a significant milestone towards creating the most precise clocks ever conceived. While challenges remain, the ongoing research and development are promising, potentially leading to groundbreaking applications in science and technology.
what is a nuclear clock and how does it work
what are the potential applications of nuclear clocks
what are the challenges in developing nuclear clocks