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The cross sections for single-arm inelastic electron-proton scattering were measured near the one-pion threshold for six values of q² between 0.23 and 1.84 GeV². We determined the cross sections for nonresonant pion production and, using a particular formulation of soft-pion theory, extracted the normalized axial-vector form factor of the nucleon, GA(q²)GA(0).
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Bloom et al. (1973) studied this question.
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