The ground-state transition is observed in the double-charge-exchange reaction ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$(${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{18}{}_{}{}^{}\mathrm{C}$) ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ti}$ at 100 MeV. A mass excess of 24.82 ± 0.30 MeV is measured for ${}_{}{}^{18}{}_{}{}^{}\mathrm{C}$.

NUCLEAR REACTIONS ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$(${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{18}{}_{}{}^{}\mathrm{C}$), $E=100\mathrm{}$ MeV; measured ${}_{}{}^{18}{}_{}{}^{}\mathrm{C}$ mass; enriched target.

• Received 13 October 1981

DOI:https://doi.org/10.1103/PhysRevC.25.1074