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Model results for the combined effects of neutron capture and spallation reactions on (a) ε64Ni (62/58) versus ε61Ni (62/58) and (b) ε60Ni (61/58) versus ε62Ni (61/58). The model predictions are for iron meteoroids with various radii, a fixed cosmic ray exposure age of 1000 Ma, a Co/Ni ratio of 0.067, and a Cu/Ni ratio of 0.0022. The Co/Ni and Cu/Ni ratios (Wasson and Kallemeyn 2002) are appropriate for IAB irons.
