Ytterbium's broken symmetry: The largest parity violations ever measured in an atom

From PhyOrg.com:

Ytterbium was discovered in 1878, but until it recently became useful in atomic clocks, the soft metal rarely made the news. Now ytterbium has a new claim to scientific fame. Measurements with ytterbium-174, an isotope with 70 protons and 104 neutrons, have shown the largest effects of parity violation in an atom ever observed - a hundred times larger than the most precise measurements made so far, with the element cesium.

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