The effective forward, perpendicular, and backward ranges of ${}_{}{}^{11}{}_{}{}^{}\mathrm{C}$ produced in the interaction of 90-350 MeV ${\pi }^{\pm }$ with carbon have been measured using conventional thick-target thick-catcher activation techniques. With increasing pion energy, the forward ranges decrease, the backward ranges increase, and the perpendicular ranges remain essentially unchanged. However, these trends are much more pronounced for ${\pi }^{-}$ than for ${\pi }^{+}$. The results have been compared with an intranuclear cascade code. The ratios of calculated effective ranges for ${\pi }^{-}$ and ${\pi }^{+}$ bombardment show the same energy dependence as observed experimentally.

• Received 12 December 1983

DOI:https://doi.org/10.1103/PhysRevC.29.2239