This paper presents the results o f a study o f the dominant neutral final states from a p interactions. T h e data were obtained in an experiment performed at the Brookhaven National Laboratory Alternating Gradient Synchrotron, using a set o f steel-plate optical spark chambers surrounding a liquid-hydrogen target. W e present differential and total cross sections for the reactions (1) a p -n +ao and (2) a-p -n + TJO (TJO-27) and total cross sections for the reactions (3) a p -n + k a o ( k = 2, 3, 4, and 5 ) and (4) a-p +all neutrals for eighteen values o f beam momentum in the interval 1.3 to 4.0 GeV/c. The angular distributions for (1) and (2) have been analyzed in terms o f expansions in Legendre polynomials, the coeficients for which are also given.
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