Phys. Rev. Lett. 29, 16211624 (1972); DOI: 10.1103/PhysRevLett.29.1621

Pi-zero Photoproduction from Neutrons

A. M. Osborne, A. Brownam, K. M. Hanson, W. T. Meyer, A. Silverman, F. E. Taylor, and N. Horwitz


We have measured the ratio of the cross section for gamma + n --> pi0 + n to the cross section for gamma + p --> pi0 + p at 4.7 and 8.2 GeV. The measurements were made by detecting the recoil nucleons in coincidence with the decay gamma rays of the pi0's produced from a deuterium target. At 4.7 GeV the cross-section ratio, R= sigma ( gamma + n --> pi0 + n) / sigma ( gamma + p --> pi0 + p), is less than 1.0 at low t, with an indication of a dip at about t=-0.7(GeV / c)^2, and rises to 1.0 at high t. The ratios at the higher energy have less structure and are uniformly closer to 1.0.

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including erratum: Phys. Rev. Lett. 30, 814 (1972)
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