Abstract
Total cross sections, differential cross sections and asymmetries for the reaction p( p,π 0)pp from threshold to 1 GeV have been measured. The outgoing π 0 was detected by a 4π neutral meson spectrometer. Our data are compared with the corresponding np→NN π ± reactions. The isoscalar partial cross sections are extracted from the relevant total cross sections. They are significant throughout the whole energy range. Below the Δ-region, energy-integrated differential cross sections show a large anisotropy difference between the neutral and charged pion channels, respectively. A partial-wave fit shows that the initial T = 0 state is dominated by the 3D 1 wave in this energy region. Finally, predictions of phenomenological models give reasonable good account of the measured observables but cannot reproduce the sign of the asymmetries.
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