Search results
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.
7 lis 2019 · Precise measurements of the differences between various electrons’ energy levels — a technique known as spectroscopy — therefore provide a way to estimate the proton’s radius.
6 lis 2019 · Atomic physicists determine the proton radius by measuring the energy difference between two electronic states of a hydrogen atom using spectroscopy. According to quantum mechanics, there is a...
11 sty 2018 · The low Q2 expansion remains. Boost effects in relativistic theories destroy our ability to determine 3D rest frame spatial distributions. The FF is the 2d FT of the transverse spatial distribution. 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.
1 lut 2014 · The Proton Radius Puzzle. Two experiments have come up with two wildly different values for the proton's radius. What's going on? By Jan C. Bernauer & Randolf Pohl. February 2014 Issue....
11 lis 2019 · The team measured a proton radius of 0.84184 femtometres. Randolf Pohl, who led that muonic hydrogen measurement and is now at the Johannes Gutenberg University in Mainz, Germany, has...
8 lip 2010 · A collaborative project to determine the root-mean-square charge radius of the proton to better than the 1% accuracy of the current 'best' value suggests that those knowledge gaps may be...
