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The proton radius puzzle is an unanswered problem in physics relating to the size of the proton. [1] Historically the proton charge radius was measured by two independent methods, which converged to a value of about 0.877 femtometres (1 fm = 10 −15 m).
7 lis 2019 · After spending eight years perfecting a spectroscopy technique, the team behind that work found a radius of 0.833 femtometres — which is consistent with the value from the muon experiments....
11 lis 2019 · The team measured a proton radius of 0.84184 femtometres. Randolf Pohl, who led that muonic hydrogen measurement and is now at the Johannes Gutenberg University in Mainz, Germany, has...
11 sty 2018 · • How to measure the proton size. • Evolution of measurements. • Recent results and the “proton size crisis”. • (Some) attempts at resolutions. • Looking forward.
30 wrz 2020 · The charge radius of the proton can be determined using two different experimental techniques: measurements of electron–proton elastic scattering cross sections and high-resolution spectroscopy...
1 kwi 2019 · The radius of the proton, commonly defined via the proton’s three-dimensional charge density, is one of them. The proton radius measured from hydrogen spectroscopy and electron–proton scattering...
But the result befuddled them: the proton radius — or more specifically, how far its positive charge extends — came out to 0.84 fm, about 0.04 fm smaller than all prior measurements. The particle’s width seemed to have shrunk by 4 percent.
