The effect of center-of-mass correlations and a restriction of the set of intermediate nuclear states have been studied for pion scattering from the mass three system. Results indicate that, for the present, these effects can be ignored.

NUCLEAR REACTIONS ${}_{}{}^3{}_{}{}^{}\mathrm{He}$(${\pi }^{\pm }$, ${\pi }^{\pm }$)${}_{}{}^3{}_{}{}^{}\mathrm{He}$, ${}_{}{}^3{}_{}{}^{}\mathrm{He}$(${\pi }^{-}$, ${\pi }^0$)${}_{}{}^3{}_{}{}^{}\mathrm{He}$, center-of-mass effects, nuclear correlations, intermediate states, nuclear structure information.

• Received 29 December 1980

DOI:https://doi.org/10.1103/PhysRevC.24.2363