Abstract
A new counter method has been developed for measuring π+ meson photoproduction near threshold. It has been employed, in particular, to examine the variation with energy of the differential cross section from hydrogen, at laboratory angles of 115° and 90° to the gamma-ray beam of the Glasgow synchrotron. Polythene and carbon targets were used. Results are compared with theory and an assessment can be made of the matrix element in the gamma-ray range 165-190 MeV. Values of absolute cross section at various energies were also obtained, e.g. for an angle of 90° and a gamma-ray energy of 170 MeV, the absolute differential cross section in centre-of-mass coordinates is (0.48 ± 0.11) × 10-29 cm2 per steradian. The measurements also confirm the generally accepted value of the π+ meson lifetime.
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