Measurements of the deuteron and proton magnetic form factors at large momentum transfers.

_. Measurements of the deuteron elastic magnetic structure function B(Q2) are reported at squared four-momentum transfer values 1.20 5 Q2 < 2.77 (GeV/c)2. Also reported are values for the proton magnetic form factor Gn.lp(Q2) at eleven Q2 values between 0.49 and 1.75 (GeV/c)2. The d t a a were obtained at the Stanford Linear Accelerator Center using the electron beam from the Nuclear Physics Injec-tor. Electrons backscattered near 180' were detected in coincidence with deuterons ~-or protons recoiling near 0' in a large solid-angle double-arm spectrometer system.. . The data for B(Q2) are found to decrease rapidly from Q2 = 1.2 to 2 (GeV/c)2, and then rise to a secondary maximum around Q2 = 2.5 (GeV/c)2. Reasonable agreement is found with several different models, including those in the relativistic impulse approximation, nonrelativistic calculations that include meson-exchange currents , isobar configurations, and six-quark configurations, and one calculation based on the Skyrme model. All calculations are very sensitive to the choice of deuteron wave function and nucleon form factor parameterization. The data for GM~(Q~) are in good agreement with the empirical dipole fit. .