3 ms·
It's defined as the slope of the electric form factor at Q^2=0. Since that is not a very helpful definition, with some hand-waving, you can say it's the root-me
by davrosthedalek 7y ago
It's defined as the slope of the electric form factor at Q^2=0. Since that is not a very helpful definition, with some hand-waving, you can say it's the root-mean-square radius of the electric charge distribution. The proton has also a magnetic radius, defined via the magnetic form factor. And something called a Zemach radius, which is a combination if them both.