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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).
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.
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).
6 mar 2017 · The radius of an atom can be approximated as $A^{1/3}r_0$ where $A$ is the number of nucleons in the atom and $r_0=1.2fm$. We could therefore say the size of the proton is equal to $r_0$ since this would give the same result as this formula.
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...
16 mar 2023 · Now researchers using a new and entirely independent method to measure proton size—one involving neutrinos rather than electrical charge—are weighing in, too.
