Electromagnetic Form Factors and Radii ofHe3

The electromagnetic form factors and radii of ${\mathrm{He}}^3$ have been evaluated using the three-body wave function obtained from a perturbational solution of the trinucleon system with the Eikemeier-Hackenbroich potential. The effect of $S^{\prime }$-state admixture and magnetic-exchange interactions are included in the calculation. Satisfactory fits to the form factors to large momentum transfer, including the correct prediction of the location of the diffraction minimum in the charge form factor, are found. Our calculations are in agreement with the latest Stanford $e-{\mathrm{He}}^3$ results in suggesting that the magnetic radius is larger than the charge radius if suitable magnetic-exchange effects are considered.