Angular Correlation Measurements inO15

An accurate measurement of the energy of a gamma transition from the 7.56-Mev level in ${\mathrm{O}}^{15}$ discloses that the transition takes place to the 5.19-Mev level in ${\mathrm{O}}^{15}$ rather than to the 5.25-Mev level. Another transition takes place through the 6.15-Mev level. The third known transition occurs through the 6.79-Mev level rather than through the 6.86-Mev level. The angular correlations of cascades from the 7.56-Mev level through the levels at 6.79 Mev, 6.15 Mev, and 5.19 Mev are measured. These results, combined with previous results on these levels, are consistent only with $J^{\pi }={\frac{3}{2}}^{+} \mathrm{and} {\frac{3}{2}}^{-}$, respectively, for the 6.79-Mev and 6.15-Mev levels. For the 5.19-Mev level, the present results indicate $J=\frac{1}{2}$, but are consistent also with $J=\frac{3}{2}$, if a suitable mixing ratio of $E2\mathrm{}$ to $M1\mathrm{}$ radiation is chosen. The preferred assignments are all consistent with the shell-model predictions and with comparisons with the ${\mathrm{N}}^{15}$ level scheme. It is noted that the doublets near 5.2 Mev in ${\mathrm{O}}^{15}$ and ${\mathrm{N}}^{15}$ are reversed in order.