We introduce and perform a systematic study of a new exactly solvable model of sphere interactions in quantum mechanics : the δ interaction, formally given by −Δ+αδ(|x|−R),  xR3,  R>0,  α∈R. We also consider the cases of a δ plus a Coulomb interaction and finitely many δ-sphere interactions with support on concentric spheres. For all these models, we provide basic properties and discuss the stationary scattering theory. We also briefly discuss the δ-sphere interaction of the second type.

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