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This topic has appeared in the trending rankings 1 time(s) in the past year. While it does not trend frequently, its appearance suggests a renewed or concentrated surge of public interest.
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Proton_radius_puzzle entered the ranking for the first time today at position #. This is its highest position ever recorded.
This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-04-21 and was most recently seen on 2026-04-21.
The proton radius puzzle was a problem in physics relating to the size of the proton. Historically the proton charge radius was measured by two independent methods, which converged to a value of about 0.877 fm. This value was challenged by a 2010 experiment using a third method, which produced a radius about 4% smaller than this, at 0.842 fm. New experimental results reported in the autumn of 2019 agree with the smaller measurement, as does a re-analysis of older data published in 2022. It is widely believed that this difference has been resolved, and the Particle Data Group reports a consensus value of 0.8409(4) fm. A study reported in 2026 gives a value of 0.8406 fm.
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