This is a continuation of our paper [Phys. Rev. D 29, 981 (1984)] on magnetic moments. The center-of-mass corrections for the static-model values for the mass and for the charge radius depend strongly on the radius of confinement $R_0$. If ${\mathrm{MR}}_0$≪1, then M=$m_e$ (electron mass) can be obtained with model parameters only about 30% smaller than those needed to fit M=$M_p$ (proton mass) for ${\mathrm{MR}}_0$>1. A composite fermion with M=$m_e$ (‘‘mock electron’’) can have 〈$r^2$〉∼$R_0$${\mathrm{}}^2$ only if its magnetic moment is 1 Bohr magneton. The center-of-mass corrections for $M_p$ are in qualitative agreement with usual estimates. For the proton charge radius they are small.

• Received 11 June 1984

DOI:https://doi.org/10.1103/PhysRevD.31.1700