By neutron bombardments of samples of Ni enriched in isotopes 61, 62, and 64, respectively, the following radioactivities have been identified: ${\mathrm{Co}}^{61}$, ${\ensuremath{\beta}}^{\ensuremath{-}}$ 1.3 Mev, no $\ensuremath{\gamma}$, half-life 1.75 hours, ${\mathrm{Co}}^{62}$, ${\ensuremath{\beta}}^{\ensuremath{-}}$ 2.3 Mev, $\ensuremath{\gamma}$ 1.3 Mev, half-life 13.9 min.Evidence is also presented for a 1.6-minute $\ensuremath{\beta}$- and $\ensuremath{\gamma}$-activity associated with ${\mathrm{Co}}^{62}$, and for a 4- to 5-minute activity possibly of ${\mathrm{Co}}^{64}$.