Angular-distribution measurements have been performed on the ${\mathrm{Ne}}^{22}(t, p){\mathrm{Ne}}^{24}$ reaction at $E_t=3.3\mathrm{}$ MeV. Formation of the ground and 4.76-MeV ${\mathrm{Ne}}^{24}$ states is characterized by $l=0\mathrm{}$ transfer, which establishes $J^{\pi }=0^{+}$ for these two states. The $J=2\mathrm{}$, 3.87-MeV state was observed to be formed via $l=2\mathrm{}$ transfer, and so even parity is indicated for this state. Proton-$\gamma$ angular-correlation experiments were carried out in method II geometry at $E_t=3.45\mathrm{} \mathrm{and} 3.33$ MeV. These results establish unambiguous $J=4\mathrm{} \mathrm{and} 2$ assignments for the respective 3.96- and 5.58-MeV levels of ${\mathrm{Ne}}^{24}$. The present experimental information on the static properties of ${\mathrm{Ne}}^{24}$ is shown to be consistent with a $j-j$ coupling-model representation involving pure twobody proton configurations. An intercomparison of the observed static properties associated with the low-lying levels of the even-$A$ neon isotopes is presented, and a remarkable similarity is shown to exist between the low-lying level structures of ${\mathrm{O}}^{18}$ and ${\mathrm{Ne}}^{24}$. It is concluded that $1d_{\frac{5}{2}}$ subshell closure effects underlie the ${\mathrm{Ne}}^{24}$ spectrum.

• Received 19 November 1969

DOI:https://doi.org/10.1103/PhysRevC.1.1446