Isovector magnetic structure of the two- and three-nucleon systems

The backward cross section for electrodisintegration of 2H near threshold and the magnetic form factors of 3H and 3He are found to be in fair agreement with empirical values up to momentum transfers about 1 GeV/c, when calculated with the Argonne two-nucleon and Urbana model-VII three-nucleon interactions, exact (A=2) and variational or 34-channel Faddeev (A=3) wave functions, and a realistic current operator constructed from the Argonne υ14 potential model. Below 1 GeV/c the exchange current contribution increases and above 1 GeV/c it strongly decreases the calculated electrodisintegration cross section. Second zeroes are predicted for the magnetic form factors of 3H and 3He at about 1.4 GeV/c. (orig.)