Gamma-Rays fromNa24

A gamma-ray spectrograph of high resolving power has been employed in measuring the quantum energies and relative intensities of the gamma-rays from ${\mathrm{Na}}^{24}$. The energies thus determined are 0.84, 1.31, 1.66, and 2.90 Mev with relative intensities 0.28, 0.41, 0.45, and 1.00. These results indicate excitation levels in the ${\mathrm{Mg}}^{24}$ residual nucleus at 1.3, 2.9, and 3.7 Mev in partial agreement with experiments on proton scattering by magnesium, but in disagreement with the level schemes suggested by previous gamma-ray measurements. Measurements were also made on the gamma-radiation of the thorium active deposit. Close agreement with previous results was considered adequate confirmation of the calibration of the spectrograph.