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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).
5 wrz 2019 · Now, a study published in the journal Science finds a new measurement for the size of the proton at 0.833 femtometres, which is just under one trillionth of a millimetre. This measurement is approximately five percent smaller than the previously-accepted radius value from before 2010.
7 lis 2019 · The team measured a proton radius of 0.84184 femtometres 3. Randolf Pohl, who led that muonic hydrogen measurement and is now at the Johannes Gutenberg University in Mainz, Germany, has...
11 sty 2018 · The slope of the FF at Q2 = 0 continues to be called the radius for reasons of history / simplicity / NRQM, but it is not the radius. Nucleon magnetic FFs crudely follow the dipole formula, G D = (1+Q2/0.71 GeV 2)-2, which a) has the expected high Q2 pQCD behavior, and b) is amusingly the 3d FT of an exponential, but c) has no theoretical ...
6 lis 2019 · Two independent and consistent measurements of the proton charge radius. Atomic physicists and nuclear physicists have each made a refined measurement of the radius of the proton.
30 wrz 2020 · The charge radius of the proton can be determined using two different experimental techniques: measurements of electron–proton elastic scattering cross sections and high-resolution spectroscopy...
1 gru 2019 · Measurements dating back to the 1950s, from work using both methods, set the proton’s radius at an apparent 0.88 femtometer (a femtometer is 10 –15 meter). In 2010 researchers led by Randolf...
