Intrinsic quadrupole moment of the nucleon

We address the question of the intrinsic quadrupole moment $Q_0$ of the nucleon in various models. All models give a positive intrinsic quadrupole moment for the proton. This corresponds to a prolate deformation. We also calculate the intrinsic quadrupole moment of the $\Delta \mathrm{}\left(1232\right).$ All our models lead to a negative intrinsic quadrupole moment of the ${\Delta }^{+}$ corresponding to an oblate deformation.