Abstract
Measurements of differential cross sections of the reactionγ+p→π 0 +p are described. In this experiment which was carried out at the Bonn 500 MeV synchrotron the recoil proton was detected.
It was the aim of the experiment to check and to extend the available cross section data towards smaller pion cm angles. In order to overcome the difficulties connected with the corresponding low proton energies a gas target and a time-of-flight telescope were used.
Absolute differential cross sections at pion cm angles of 40°, 50°, 60° and 70° and at photon lab energies between 240 and 380 MeV are reported.
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We should like to thank Prof. G. Knop, Drs. W. Pfeil and D. Schwela and Dipl. Phys. P. Noelle for many valuable discussions. We are indebted to Dr. H. Genzel for his advice, in particular for providing us with his compilation of various range-energy data. Our thanks further go to the synchrotron crew Mr. P. Haas, J. Karthaus, K. Küffner and H. Schneider for the excellent operation of the accelerator and to Mr. H. Finken for taking care of the mechanical problems. The financial support by the “Bundesministerium für Forschung und Technologie” is gratefully acknowledged.
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Jaeckel, K., Kaiser, H., Kemen, H. et al. Photoproduction of neutral pions on hydrogen below 500 MeV. Z. Physik 268, 27–36 (1974). https://doi.org/10.1007/BF01670058
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DOI: https://doi.org/10.1007/BF01670058