Résumé : The production of η′π0 system in π-p charge-exchange interactions at π- momenta 38 GeV/c and 100 GeV/c has been studied. The 2γ and ηπ0π0 decay modes of η′ leading to 4γ and 8γ final states respectively have been detected. No statistically significant peak is observed in the η′π0 mass spectrum in the range of 1.2 GeV÷2.1 GeV. An upper limit of 6·10-3 has been established for the a20(1320)→η′π0 branching ratio. © 1992 Springer-Verlag.