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Particles and interactions

Particles and interactions

Pions form a new kind of helium

11 May 2020
Artistic representation of pionic helium in laser light
Pionic helium In this experiment, a pion – shown here with one orange and one blue particle representing its quark and anti-quark – replaces one of the two electrons in the helium atom. This new metastable atom is then excited with laser light (shown here in red) to probe its properties. (Courtesy: Max Planck Institute of Quantum Optics/Thorsten Naeser)
The ability to make artificial atoms containing exotic particles in place of electrons is giving phy

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Edwin Cartlidge is a science writer based in Rome.
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