The energies of twenty-seven excited states of ${\mathrm{Ne}}^{21}$ and seventeen of ${\mathrm{Ne}}^{23}$ have been established by a study of the ($d, p$) reactions in ${\mathrm{Ne}}^{20}$ and in ${\mathrm{Ne}}^{22}$. Seven deuteron bombarding energies between 4.75 and 7.5 Mev were used, and the target was a cell with thin windows, containing either natural or ${\mathrm{Ne}}^{22}$-enriched neon gas. The proton groups emitted at 90 degrees were analyzed with a broad-range magnetic spectrograph. The established calibration of the spectrograph, in terms of alpha particles from polonium, together with some well-known reactions, provided the data necessary for precise energy determinations. The $Q$ values obtained for the ground-state reactions ${\mathrm{Ne}}^{20}(d, p){\mathrm{Ne}}^{21}$ and ${\mathrm{Ne}}^{22}(d, p){\mathrm{Ne}}^{23}$ were 4.534±0.009 Mev and 2.791±0.009 Mev, respectively. Deuteron groups inelastically scattered from ${\mathrm{Ne}}^{20}$ and ${\mathrm{Ne}}^{22}$ were also observed. The higher energy groups were used in the calibration procedure; the lower energy groups gave the results 4.250±0.008 Mev and 3.356±0.008 Mev for the second excited states of ${\mathrm{Ne}}^{20}$ and ${\mathrm{Ne}}^{22}$, respectively. The interpretation of the level schemes of ${\mathrm{Ne}}^{21}$ and ${\mathrm{Ne}}^{23}$ in terms of the collective model has been considered and is discussed here briefly.

• Received 28 June 1960

DOI:https://doi.org/10.1103/PhysRev.120.1436