Systematics of pion absorption onLi6

Particle emission following ${\mathrm{\pi }}^{+}$ absorption on ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ at ${\mathit{T}}_{\mathrm{\pi }}$=50, 100, 150, and 200 MeV was studied with a large-solid-angle detector. Evidence is found for a three-nucleon-absorption mode, which takes place predominantly on pnn triplets. This mode increases in importance from about a quarter of the absorption cross section at 50 MeV to about one-half at 200 MeV.