Isospin dependence of pion absorption on a pair of nucleons

The relative ccross sections for the 2N+..pi -->..2N reactions were determined where the initial two nucleons are in a relative s state, and coupled either to isospin zero or to one. This information is extracted from two-nucleon coincidence measurements of the (..pi../sup +/,2p) and the (..pi../sup -/,pn) reactions on targets of /sup 3/He and /sup 4/He.