The invention relates to a method for finding a target material and a target material. According to the invention, a layer sequence for a target material is determined in an iterative process which makes use of Formula 1, where (E, ΔE) is the number of neutrons produced, i = index that denotes the layer, namely 1,2,3 ... ..nNthe Avogadro constant, ρ (g cm) the density of the selected element, M (g) the molar mass of the selected element, Ed the energy of entry of the primary ion into layer i, ΔE the energy loss of the primary ion when the layer thickness δ, δ passes (E, ΔE) (cm) the layer thickness of the selected element for energy loss of the ions ΔE at an entry energy of E, σ (E, ΔE) (cm) the integral cross section over the energy range ΔE for the emission probability from one or more neutrons the interaction between ions and atomic nuclei of element i. The layers determined in this way are combined to form a target material.
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