The sensitivity of elastic π^±-α scattering to the pion form factor is calculated, using the velocity-dependent Kisslinger optical model. At 60 MeV an accuracy of 0.01 mb/sr should give the pion rms charge radius r_π to a few tenths of a fermi; additional form-factor details are not readily measurable. The use of the deuteron and other targets is examined.
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Auerbach et al. (1968) studied this question.
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