Decay ofCo58

${\mathrm{Co}}^{58}$ decays not only to the first but also to the second excited state of ${\mathrm{Fe}}^{58}$. Both of these states in ${\mathrm{Fe}}^{58}$ possess spin 2, even parity, and the transition between them is a mixture of $E2\mathrm{}$ and $M1\mathrm{}$, with a mixing ratio $\delta \left(\frac{E2\mathrm{}}{M1\mathrm{}}\right)=+2.2\mathrm{}\pm 0.3$. The intensities of the 1.62-Mev and 0.81-Mev gamma rays originating from the second excited state (relative to the main 0.81-Mev transition) are 0.005±0.001 and 0.016±0.005, respectively.