Recoil measurement of the /sup 12/C(. pi. (,. pi. N)/sup 11/C reaction between 90 and 350 MeV

The effective forward, perpendicular, and backward ranges of /sup 11/C produced in the interaction of 90--350 MeV ..pi../sup + -/ 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../sup -/ than for ..pi../sup +/. The results have been compared with an intranuclear cascade code. The ratios of calculated effective ranges for ..pi../sup -/ and ..pi../sup +/ bombardment show the same energy dependence as observed experimentally.