The reaction ${\mathrm{Ne}}^{20}({\mathrm{He}}^2,\alpha ){\mathrm{Ne}}^{19}$ ($Q=3.702\mathrm{}$ MeV) has been used to determine the energy of excited states of ${\mathrm{Ne}}^{19}$ up to an excitation of 5 MeV. A thin surface-barrier detector was mounted inside a differentially pumped gas target chamber and measurements were made at ${\mathrm{He}}^3$ bombarding energies of 5.90 and 6.00 MeV. Alpha-particle groups were measured at lab angles 130°, 145°, 165°, and 167.5°. Six kinematically consistent groups are assigned to ${\mathrm{Ne}}^{19}$. The excitation energies thus determined for the levels of ${\mathrm{Ne}}^{19}$ are 4.013, 4.152, 4.344, 4.547, 4.689, and 5.077 MeV, where the probable uncertainty is ± 15 keV. These previously unreported levels are found to correspond closely with levels of the mirror nucleus, ${\mathrm{F}}^{19}$.

• Received 22 August 1966

DOI:https://doi.org/10.1103/PhysRev.153.1068