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28 kwi 2022 · Your value for the “proton radius”, $r_p \approx 0.8\,\rm fm$, is the proton’s “charge radius,” a parameter that describes the distribution of electric charge in the region surrounding the center of a proton. If you were to imagine a rigid, hard-shelled proton, there are several different ways you might distribute its electric charge ...
The radius of the proton is defined by a formula which can be calculated by quantum electrodynamics and be derived from either atomic spectroscopy or by electron–proton scattering. The formula involves a form-factor related to the two-dimensional parton diameter of the proton.
The proton radius is about one femtometre = 10 −15 metre. It can be measured by the scattering of electrons by the nucleus. Relative changes in the mean squared nuclear charge distribution can be precisely measured with atomic spectroscopy .
30 wrz 2020 · The proton charge radius, r p, defined by equation 1, is also commonly interpreted non-relativistically as the square root of the average value of r 2 in a spherically symmetric charge density.
8 lip 2010 · 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 world average 3, which is mainly inferred from H spectroscopy.
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.
1 lut 2014 · The radius of a proton, he found, was about 0.879 femtometer—about one ten-billionth the size of a droplet of mist and square in line with previous measurements.
