A study of the decay of ${\mathrm{Co}}^{62}$ has been made using $\beta$- and $\gamma$-scintillation techniques. The ${\mathrm{Co}}^{62}$ was produced by a ($d, \alpha$) reaction on nickel oxide enriched in ${\mathrm{Ni}}^{64}$. A half-life of 13.91 minutes with a calculated standard deviation of ±0.05 minute was measured. Two beta groups of 0.88±0.04 and 2.88±0.03 Mev energy were found, with relative abundances of 25% and 75%, respectively. Both $\beta$-ray transitions appear to be allowed. Gamma rays of 1.17±0.01, 1.47±0.02, 1.74±0.03, and 2.03±0.03 Mev were measured, with relative percentages of 100% and 82% for each member of the 1.17-Mev doublet, and 18%, 18%, and 7% for the others, respectively. A much weaker $\gamma$ ray with an energy of ∼2.5±0.2 Mev and an intensity of less than 2% was also noted. A level scheme incorporating these data is presented. All energy errors are estimated standard deviations.

• Received 13 May 1957

DOI:https://doi.org/10.1103/PhysRev.107.1628