The results of a systematic study of 0^∘{} pion production by heavy ions from 125 to 400 MeV/nucleon are presented. The dependence of the cross section on the mass number of the target, the energy of the beam, and the pion charge and energy are discussed. A striking feature of the data is an unexpectedly large π^-π⁺ ratio for pions of valocity close to the projectile velocity.
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Benenson et al. (1979) studied this question.
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