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With pd collisions at T p = 1.2 GeV exclusive measurements of the quasi-free pn → ppπ 0 π − reaction have been carried out. Using the WASA detector setup at COSY total and differential cross sections have been obtained for the energy region √ s = 2.35 -2.48 GeV. Though this includes the region of the ABC effect and its associated resonance structure, no low-mass enhancement (ABC effect) is found in the π 0 π − -invariant mass spectrum -in agreement with the constraint from Bose statisticsdoi:10.1051/epjconf/20123709033 fatcat:fgcgsrdvkbglxfabg7b3qflcnu