Disintegration Scheme ofBr80(18 min)

The 18-min isomer ${\mathrm{Br}}^{80}$ is shown to emit $\gamma$ rays of 620-kev energy which follow a low intensity (9±2 percent) $\beta$-ray branch. Beta-gamma coincidences are observed, indicating that the gamma transition takes place in ${\mathrm{Kr}}^{80}$. No $\gamma$-ray transition was found to follow the positron or $K$ capture branch. The intensity observed is compatible with a spin and parity assignment 1 + for the ground state of ${\mathrm{Br}}^{80}$, while the 620-kev state in ${\mathrm{Kr}}^{80}$ is probably 2+. The gamma-ray energy observed fits well into the pattern for the energy of the first excited state of even-even nuclei.