Gamma Production In P Ne-20 And Pn Interactions At 300 Gev

Data on the multiplicity and inclusive spectra of gamma produced in inelastic p Ne-20 and pN interactions at 300 GeV are presented. The gamma multiplicity for p Ne-20 interactions is 11.43 +/- 0.23, and the ratio of for p Ne-20 and pN interactions is 1.48 +/- 0.05. From an analysis of the effective-mass distributions, = 4.91 +/- 0.52 and = 1.47 +/- 0.33. In fact, eta-0 production is much higher in p Ne-20 interactions [R(eta-0/pi-0) = 0.66 +/- 0.12 for n(p) greater-than-or-equal-to 2] than in pN interactions [R(eta-0/pi-0) = 0.06 +/- 0.04]. No eta'(958) signal is seen. Strong correlations between and n(p), the number of secondary protons, are observed, primarily from the central and target fragmentation regions. Inclusive y* and p perpendicular-to spectra are analyzed and evidence for low-energy cascading and rescattering of fast particles in the projectile fragmentation region is discussed. The data are compared to the predictions of the additive quark model, the Lund model, and the dual parton model.