The decay of ${\mathrm{Rb}}^{83}$ has been determined to proceed by electron capture to an excited state of ${\mathrm{Kr}}^{83}$ which is 0.566 Mev above the ground state. This excited state is depopulated exclusively by emission of a 0.525-Mev gamma ray ($M1\mathrm{}$) to the 0.041-Mev state, ${\mathrm{Kr}}^{83m}$. Little or no electron capture direct to the 0.041-Mev level or to lower levels occurs. The spin-parity designation of the 0.566-Mev state is $p_{\frac{3}{2}}$, and that of the ${\mathrm{Rb}}^{83}$ ground state is $f_{\frac{5}{2}}$.

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