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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.
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).
1 kwi 2019 · The proton radius measured from hydrogen spectroscopy and electron–proton scattering experiments is about 0.88 fm, whereas spectroscopy of muonic hydrogen atoms reveals a radius of 0.84 fm.
30 wrz 2020 · Key points. The charge radius of the proton can be determined using two different experimental techniques: measurements of electron–proton elastic scattering cross sections and...
7 mar 2019 · In a new study, Miller shows how the proton radius can be defined in a unified way according to photon-proton interactions. The first measurements of the proton radius were based on the energy levels of hydrogen, giving a value of around 0.88 femtometers.
19 cze 2021 · Giving equal weight to both numbers, the group ended up with a simple unweighted mean of 0.855 fm for the proton radius.
5 wrz 2019 · There’s a problem with protons, but we’re one step closer to solving it. We aren’t quite sure what the radius of a proton is and a new way of measuring has helped to fix the puzzle.
