Abstract
The results of an investigation of high-energy (>4 Bev) pion-nucleon interactions are briefly described together with a detailed list of the assumptions made. Only peripheral pion-nucleon collisions with strong pion-pion interactions are considered. The problem of obtaining the branching ratio R of pi /sup -/ + p yields pi /sup 0/ + pi /sup -/ + p to pi /sup / + p yields pi /sup +/ + pi /sup -/ + n from the experimental branching ratio R/sub exp/ is treated. For Walker's data at 4.5 Bev, R/sub exp/R is calculated to be approximately 4, and for various pion-pion scattering amplitudes, R is calculated and tabulated with the isotopic spins. For the process pi /sup -/ + p yields pi /sup -/ + pi /sup -/ + pi /sup +/ + p occurring in a bubble chamber, the relative frequency of occurrence of stars with slow backward pions being positive or negative is calculated for seven extreme cases, and the er or somewhat smaller than sigma ( pi /sup -/p yields pi /sup -/ pi /sup +/n) (1 mb) for 4.5 Bev. (D.L.C
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