The polarization of recoiling protons from the photoproduction of π⁰ mesons on liquid hydrogen has been measured for primary photon energies between 500 and 1000 MeV over a range of π⁰ c.m. angles from 55^∘{} to 130^∘{}. The results show structure not observed previously in experiments of less precision. In particular, the polarization at 90^∘{} c.m. is close to zero at a primary photon energy of 900 MeV. Also, a strong dependence of polarization on π⁰ c.m. angle between 600 and 900 MeV was observed. A subsidiary measurement of the polarization of the recoil protons from elastic e-p scattering at 900 MeV and q²=10 F^-2 gave a value (1.3±{}2.0)%.
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Lundquist et al. (1968) studied this question.
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