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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).
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).
The CODATA recommended value of a proton's charge radius is 8.4075(64) × 10 −16 m. [54] The radius of the proton is defined by a formula that can be calculated by quantum electrodynamics and be derived from either atomic spectroscopy or by electron–proton scattering.
7 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...
11 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.
8 lip 2010 · Our experimental precision would suffice to deduce r p to 4 × 10 −4. This new value of the proton radius r p = 0.84184(67) fm is 10 times more precise, but 5.0σ smaller, than the previous ...
The Bohr radius ( ) is a physical constant, approximately equal to the most probable distance between the nucleus and the electron in a hydrogen atom in its ground state. It is named after Niels Bohr, due to its role in the Bohr model of an atom. Its value is 5.291 772 105 44 (82) × 10 −11 m. [1] [2]
