Science
ETH–PSI ‘atomic cannon’ fires cold muonium beam toward Einstein gravity test
A Nature Physics breakthrough produces an intense, near-parallel beam of exotic atoms so researchers can ask whether second-generation matter falls like ordinary matter.
Published: October 4, 2026 · 1 min read
The experiment leans on PSI’s intense continuous muon beams and support from Switzerland’s Muoniverse national research centre. Beyond gravity, the same cold beam could sharpen laser spectroscopy of muonium, refining estimates of the muon mass and related fundamental constants. Nature Physics published the primary methods paper (“Generation of a high-intensity, superthermal muonium beam…”) with a companion perspective on intense superthermal muonium beams; SciTechDaily summarised the public-facing stakes for a wider audience in early October. For Canadian readers following fundamental physics, the result is a reminder that precision tests of gravity are no longer limited to falling towers and satellite mirrors: they now include factory-scale particle accelerators coaxing the universe’s heavier siblings into orderly flight. Sources: ETH Zurich; Paul Scherrer Institute; Nature Physics; SciTechDaily.
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