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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).
5 maj 2023 · The closest equivalent I can find is the proton charge radius, which stems from electron-proton scattering. Edit: The differential cross section of high energy photons hitting protons found here (Figs. 10 and 11) looks quite similar to data from Compton scattering off an electron (pdf, Fig 2).
7 lis 2019 · About ten years ago, it seemed that both spectroscopy and scattering experiments had converged on a proton radius of 0.8768 femtometres (millionths of a millionth of a millimetre).
6 lis 2019 · Atomic physicists determine the proton radius by measuring the energy difference between two electronic states of a hydrogen atom using spectroscopy. According to quantum mechanics, there is a...
11 lis 2019 · That means muon measurements of the proton’s radius should be millions of times more precise than those made using ordinary hydrogen. The team measured a proton radius of 0.84184 femtometres.
1 lut 2014 · The Proton Radius Puzzle. Two experiments have come up with two wildly different values for the proton's radius. What's going on? By Jan C. Bernauer & Randolf Pohl. February 2014 Issue....
26 lis 2019 · How do you measure the width of a proton? A ruler won't help and neither will a microscope. Instead, it involves smashing electrons into protons at nearly the speed of light, then measuring how...
