Electromagnetic Polarizabilities and Charge Radii of the Nucleons in the Diquark-model

The diquark model is used to calculate the electromagnetic polarizabilities and charge radii of the nucleons for three different potentials. Making the scalar diquark lower in mass introduces a mixing angle $\theta$ between the $\mid 56⟩$ and $\mid 70⟩$ states ,which allows an improvement in value of all 6 properties. Generalizing the Gamov-Teller matrix and the magnetic moment operator to the diquark model gives constraints on this mixing. We obtain for the Richardson potential $\theta ={23.2}^{\circ },$ ${\bar{\alpha }}_p=7.9_{-0.9}^{+1.0}\times {10}^{-4}f{m}^3,$ $\overline{\alpha }n=7.7{-0.6}^{+0.3}\times 10^{-4}fm^3,$ $\overline{\beta }p=5.4{-0.4}^{+1.6}\times 10^{-4}fm^3,$ $\overline{\beta }% n=6.7{-0.7}^{+1.3}\times 10^{-4}fm^3,$ $\left\langle r^2\right\rangle p=0.37{-0.03}^{+0.02}fm^2,$ $\left\langle r^2\right\rangle n=-0.07{-0.02}^{+0.03}fm^2.$ Additional pion cloud contributions could improve on all six results.