The reaction ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}({}_{}{}^3{}_{}{}^{}\mathrm{He},p\gamma ){}_{}{}^{20}{}_{}{}^{}\mathrm{F}$ has been used to populate excited states in ${}_{}{}^{20}{}_{}{}^{}\mathrm{F}$. One of these states at an excitation energy of 6519 ± 3 keV has been identified with the analogue of the ${}_{}{}^{20}{}_{}{}^{}\mathrm{O}$ ground state. The mass excesses of the four known $T=2\mathrm{}$ states for $A=20\mathrm{}$ are in accord with the isobaric mass multiplet equation.

NUCLEAR REACTION ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}({}_{}{}^3{}_{}{}^{}\mathrm{He},p\gamma )$, $E_{{}_{}{}^3{}_{}{}^{}\mathrm{He}}=5\mathrm{}$ MeV; measured $E_p$, $E_{\gamma }$; deduced energy of lowest $T=2\mathrm{}$ state in ${}_{}{}^{20}{}_{}{}^{}\mathrm{F}$.

• Received 16 October 1975

DOI:https://doi.org/10.1103/PhysRevC.13.879