Pions from Production of Baryons by Protons

When matter is bombarded by very high-energy nucleons, over 600 Mev in the laboratory system, part of the pions produced may be decay products of excited nucleons of ordinary spin and isobaric spin $\frac{3}{2}$ ("baryons") produced by the incident nucleons. Assuming charge independence, we discuss the ratios of the cross sections for various possible processes creating one or more pions.