Gamma Radiations ofNa23andNe20

Abstract

${\mathrm{Na}}^{23}$ and ${\mathrm{Ne}}^{20}$ gamma rays were observed from the proton bombardment at various energies of thin evaporated Na and NaI targets and of a natural Ne gas target. Gamma rays involving ${\mathrm{Na}}^{23}$ states up to 4 Mev and ${\mathrm{Ne}}^{20}$ states up to 5 Mev were observed and decay schemes and branching ratios obtained. The 2.08- and 2.70-Mev states of ${\mathrm{Na}}^{23}$ are probably $\frac{7}{{2}^{+}}$ and $\frac{9}{{2}^{+}}$, respectively. Limitations on spin and parity values are given for other states. The results obtained for ${\mathrm{Na}}^{23}$ are consistent with the results of a strong-coupling collective calculation. The 4.97-Mev state of ${\mathrm{Ne}}^{20}$ has an upper limit for the ground-state branch of 4%. An upper limit of 9% is placed on the ground-state branch of the 4.2-Mev state of ${\mathrm{Ne}}^{20}$. Gamma rays from the ${\mathrm{F}}^{19}(d, n\ensuremath{\gamma}){\mathrm{Ne}}^{20}$ reaction were observed with energies of 11.4, 10.67, 10.16, 9.37, 8.37, and 7.36 Mev.