The beta and gamma radiations of 38-sec ${\mathrm{Ne}}^{23}$ have been studied by means of scintillation spectrometer techniques. Beta transitions were found to the ground, first, and second excited states of ${\mathrm{Na}}^{23}$ with end-point energies equal to 4.39±0.05, 3.95±0.05, and 2.4±0.1 Mev, respectively. Their percent intensities and $log\mathrm{ft}$ values are: 67±3, 5.25; 32±3, 5.38; and 1.00±0.15, 5.88, respectively. Gamma rays are coincident with the latter two beta transitions and with one another; their energies and percent relative intensities are: 436±4 kev; 100; 1647±16 kev, 3.0±0.3, respectively. Higher energy gamma radiation was present in less than 0.2% of all decays. No beta transitions with $log\mathrm{ft}$ values in the superallowed group were found. A decay scheme based on the above data is proposed.

The half-life of ${\mathrm{Ne}}^{23}$ was remeasured together with the half-lives of ${\mathrm{O}}^{15}$ and ${\mathrm{Ne}}^{19}$. The results are: ${\mathrm{Ne}}^{23}$, 37.6±0.1 sec; ${\mathrm{O}}^{15}$, 123.95±0.50 sec; ${\mathrm{Ne}}^{19}$, 17.7±0.1 sec.

• Received 30 July 1956

DOI:https://doi.org/10.1103/PhysRev.105.647