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Results a r e presented on a series of measurements of p-photoproduction from hydrogen, deuterium, and complex nuclei ranging up to lead, at photon energies ranging from 4 to 9 GeV. Detailed dipion mass-spectrum fits a r e presented, using a Drell-type nonresonant background and its interference with the resonant amplitude, with no other arbitrary backgrounds. For hydrogen and deuterium, the inelastic contributions have been subtracted. The A dependence of the cross sections i s analyzed to yield values of -yp2/47r and u at 4 average photon energies of 6.1, 6.5, and 8.8 GeV. The hydrogen-to-deuterium ratlos indicate the presence of possible nondiffractive amplitudes at low energies which then decrease with energy.

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A 64, 1053 (1969). 10 F is the total angular momentum quantum number of the jud system, which in the lowest orbital state (L = 0) can be either i or §. The energy difference between these two hyperfine states is 0.046 eV. In our conditions KT~ 0.025 eV, where K is the Boltzmann constant, andT = 293°K. n V. P. Dzhelepov, P. F. Ermolov, V. I. Moskalev, V. V. Fil'chenkov, and M. Friml, Zh. Eksp. Teor. Fiz. 47_, 1243(1964) [Sov. Phys.-JETP 2£, 841(1965]. 12 E. Cremmer, Nucl. Phys. B 2, 409 (1967). 13 The values (3) were obtained assuming g A /g v = -1.18,