Beta decay ofV54−55and the mass ofV55

${}_{}{}^{54}{}_{}{}^{}\mathrm{V}$ and the previously unreported ${}_{}{}^{55}{}_{}{}^{}\mathrm{V}$ have been produced in the ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}({}_{}{}^9{}_{}{}^{}\mathrm{Be},2np){}_{}{}^{54}{}_{}{}^{}\mathrm{V}$ and ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}({}_{}{}^9{}_{}{}^{}\mathrm{Be},np){}_{}{}^{55}{}_{}{}^{}\mathrm{V}$ reactions at 20-MeV beam energy, and the subsequent $\beta$ decays to ${}_{}{}^{54}{}_{}{}^{}\mathrm{Cr}$ and ${}_{}{}^{55}{}_{}{}^{}\mathrm{Cr}$ have been studied via delayed $\gamma$-ray singles and $\gamma -\gamma$ and $\beta -\gamma$ coincidence techniques. We measure the half-lives of ${}_{}{}^{54-55}{}_{}{}^{}\mathrm{V}$ to be 49.82 ± 0.46 and 6.54 ± 0.15 sec, respectively. From analysis of the $\beta$-ray energy spectrum, a mass excess of -49152 ± 100 keV is determined for ${}_{}{}^{55}{}_{}{}^{}\mathrm{V}$. Comparison with theoretical mass predictions is made.