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Vienna and Beijing teams build first thorium nuclear clocks

Original: Teams in Vienna and Beijing have built the first thorium nuclear clocks

Research teams in Vienna and Beijing have independently built the first nuclear clocks based on thorium-229, using an atomic nucleus rather than electron transitions to keep time. The clocks promise far greater precision than today's best atomic clocks and could test whether fundamental constants of physics change over time. The achievement follows years of effort to find a practical laser excitation of thorium's unique low-energy nuclear transition.

Why now: The first working nuclear clocks mark a major scientific breakthrough in precision timekeeping, drawing wide attention.

ViennaBeijingthorium-229nuclear clock

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• Teams in Vienna and Beijing have built the first thorium nuclear clocks · gumby · 186

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