With neon gas enriched either to 93 percent ${\mathrm{Ne}}^{22}$ or to 99 percent ${\mathrm{Ne}}^{20}$ we confirm the observations with less well-concentrated isotopes by Elder, Motz, and Davison on the ${\mathrm{Ne}}^{20}\mathrm{}(d,p)\mathrm{}{\mathrm{Ne}}^{21}$ and ${\mathrm{Ne}}^{22}\mathrm{}(d,p)\mathrm{}{\mathrm{Ne}}^{23}$ reactions. Aided by the enrichment factor of 3 for ${\mathrm{Ne}}^{21}$ in the "heavy" neon, we find a long-range proton group from ${\mathrm{Ne}}^{21}\mathrm{}(d,p)\mathrm{}{\mathrm{Ne}}^{22}$ with a $Q$ of 6.79±0.10 Mev for the reaction. Consideration of these and other reactions involving neon isotopes show that the mass of ${\mathrm{Ne}}^{21}$ is 21.00062±0.00010 and that this new proton group indicates an excited state at 1.37 Mev in the ${\mathrm{Ne}}^{22}$ nucleus.

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