2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/192461Characteristic properties of pionium $A_{2π}$ and associated low energy s--wave cross sections $σ(π^0π^0\to π^0π^0)$, $σ(π^+π^-\toπ^0π^0)$ and $σ(π^0π^0\to π^+π^-)$ are investigated with a coupled channels potential model. Some experimental results and conclusions are to be reconsidered.10 Pages REVTeX using epsfig.sty. Submitted to PRCNuclear Theorytext