Measurements of the neutron electric to magnetic form factor ratio G{sub En}/G{sub Mn} via the {sup 2}H(e{yields},e{sup '}n{yields}){sup 1}H reaction to Q{sup 2}=1.45 (GeV/c){sup 2}

We report values for the neutron electric to magnetic form factor ratio, G{sub En}/G{sub Mn}, deduced from measurements of the neutron's recoil polarization in the quasielastic {sup 2}H(e{yields},e{sup '}n{yields}){sup 1}H reaction, at three Q{sup 2} values of 0.45, 1.13, and 1.45 (GeV/c){sup 2}. The data at Q{sup 2}=1.13 and 1.45 (GeV/c){sup 2} are the first direct experimental measurements of G{sub En} employing polarization degrees of freedom in the Q{sup 2}>1 (GeV/c){sup 2} region and stand as the most precise determinations of G{sub En} for all values of Q{sup 2}.