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Photoproduction of Charged Mesons from Free Nucleons for Bombarding Gamma-Ray Energies Near 275 MeV
Phys. Rev. 136, B201 – Published 12 October, 1964
DOI: https://doi.org/10.1103/PhysRev.136.B201
Abstract
The differential cross section for the photoproduction of a meson from the neutron bound in the deuteron was measured for pion laboratory angles of 76°, 96°, and 118° at incident gamma-ray energies in the region of 275 MeV. The meson and the high-energy proton were detected. The pion momentum and angle were measured by sets of spark chambers situated in front of and behind a magnetic field. The proton angle and range were also measured with spark chambers. To calculate "free" neutron cross sections from our data, we used a modified version of the extrapolation method suggested by Chew and Low. By observing the only, the differential cross section for photoproduction from hydrogen also was measured. As determined by this experiment, the differential cross section for photoproduction of a meson from a "free" neutron and the differential cross section for photoproduction of a meson from hydrogen are as follows: These results disagree with the dispersion theory predictions of Chew, Goldberger, Low, and Nambu. They also disagree with McKinley's dispersion theory calculations which include a bipion or -meson term in the production amplitudes.
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