We analyze, using basic geometrical arguments, the $A$ dependence of the total pion absorption cross section, the effective number of nucleons sharing the pion momentum and energy, and the proton yields from ${\pi }^{+}$ and ${\pi }^{-}$ induced reactions. The results are consistent with the pion penetrating some distance through the nuclear volume and annihilating on a pair of nucleons.

NUCLEAR REACTIONS transport theory applied to true pion absorption in nuclei.

• Received 12 May 1980

DOI:https://doi.org/10.1103/PhysRevC.22.1219