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We investigate the reactions $\pi N \to a_0 N$ and $p p \to d a_0^+$ nearthreshold and at medium energies. An effective Lagragian approach and the Reggepole model are applied to analyze different contributions to the cross sectionof the reaction $\pi N \to a_0 N$. These results are used to calculate thedifferential and total cross sections of the reaction $p p \to d a_0^+$ withinthe framework of the two-step model in which two nucleons produce an$a_0$-meson via $\pi$ -meson exchange and fuse to a deuteron. The necessity ofnew measurements on $a_0$ production and branching fractions (of its decay tothe $K\bar K$ and $\pi\eta$ channels) is emphasized for clarifying the $a_0$structure. Detailed predictions for the reaction $pp \to d a_0^+$ are presentedfor the energy regime of the proton synchrotron COSY-J\"ulich.Comment: 9 pages, including 6 eps figure

Production of a0-mesons in the reactions πN↦a0N and pp↦da0 + at GeV energies