a0(980)–f0(980) mixing and isospin violation in the reactions pN→da0, pd→3He/3H a0 and dd→4He a0

It is demonstrated that f0–a0 mixing can lead to a comparatively large isospin violation in the reactions pN→da0, pd→3He/3H a0 and dd→4He a0 close to the corresponding production thresholds. The observation of such mixing effects is possible, e.g., by measuring the forward–backward asymmetry in the reaction pn→da00→dη π0.