Recoil measurement of the C 12 ( π ± , π N ) C 11 reaction between 90 and 350 MeV

The effective forward, perpendicular, and backward ranges of $^{11}\mathrm{C}$ produced in the interaction of 90-350 MeV ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ 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 ${\ensuremath{\pi}}^{\ensuremath{-}}$ than for ${\ensuremath{\pi}}^{+}$. The results have been compared with an intranuclear cascade code. The ratios of calculated effective ranges for ${\ensuremath{\pi}}^{\ensuremath{-}}$ and ${\ensuremath{\pi}}^{+}$ bombardment show the same energy dependence as observed experimentally.