Nucl. Phys. B22, 131 (1970). 1 9 0 . Czyiewski and M. Szeptycka, Phys. Lett. 25B, 482 (1967). 2 0 B r u x e l l e s -~~~~-~r a c o w Collaboration, A. Eskreys et al. , Nucl. Phys. (to be published).Measurements of differential cross sections for quasielastic electron-deuteron scattering e + de + p + n have been made in which recoil protons were detected in coincidence with the scattered electrons. The ratios of the elastic electron-neutron to the electron-proton scattering cross sections are derived from the proton coincidence data. For comparison, these ratios are also determined from the scattered-electron momentum spectra using the peak and area methods. The theory developed by Renard, Tran Thanh Van, and LeBellac, which includes corrections for the final-state interactions, is found to explain the proton coincidence results. The present measurements, made at an electron scattering angle of 90" for four-momentum transfers of q = 7, 10, 15, and 29 F-', and at 80' for q = 45 F-', are combined with previous results to obtain the electromagnetic form factors of the neutron.
Elastic electron-proton scattering cross sections were measured at backward angles (80"-90") in the laboratory for four-momentum transfers between 7 F -~ and 45 F-'. Experimental errors range from 3.1% to 5.3%, including a systematic error estimated to be 1.9% added in quadrature. Electric and magnetic form factors are computed from all the recent data in this q2 range, with allowance made for possible normalization differences. The results show a deviation from the scaling law.
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