Cross sections and asymmetries for the [formula omitted] reaction from threshold to 1 GeV

• Published in: Nuclear physics. A 1995-07, Vol.590 (3), p.763-784
• Main Authors: Rappenecker, G., Rigney, M., Didelez, J.P., Hourany, E., Rosier, L., van de Wiele, J., Berrier-Ronsin, G., Elayi, A., Frascaria, R., Hoffmann-Rothe, P., Anton, G., Arends, J., Breuer, M., Büchler, K., Nöldeke, G., Zucht, B., Blanpied, G., Preedom, B., Laget, J.M., Saghai, B.
• Format: Article
• Language: English
• Subjects: Nuclear reaction
• ISSN: 0375-9474
• DOI: 10.1016/0375-9474(95)00191-3

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.