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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...
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- Review Articles
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).
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...
8 lip 2010 · The root-mean-square charge radius, rp, has been determined with an accuracy of 2 per cent (at best) by electron–proton scattering experiments1,2.
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.
24 lut 2021 · A recent experiment from the JLAB-CLAS collaboration gives a small value for the radius (The symbol $$R_E^\alpha $$ stands for the root-mean-square charge radius of the proton $$\sqrt{\langle r_E^2\rangle }$$ , obtained by the experimental or theoretical Collaboration $$\alpha $$ .) $$R_E^\mathrm{CLAS}= (0.831\pm 0.007_\mathrm{stat}\pm 0.012 ...
6 lis 2019 · Nuclei that have typically been observed include hydrogen (with one proton) or deuterium (with a proton and a neutron). These two different methods yielded a radius of about 0.88 femtometers. In 2010, atomic physicists announced results from a new method.
