Mass and beta decay ofSi34

${}_{}{}^{34}{}_{}{}^{}\mathrm{Si}$ has been produced via the ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}({}_{}{}^{18}{}_{}{}^{}\mathrm{O}, 2p){}_{}{}^{34}{}_{}{}^{}\mathrm{Si}$ reaction at 32 MeV beam energy. Identification is made from the observed $\gamma$ rays of energies 429.07(13) and 1607.56(50) keV, which agree with the known excitation energies of the first two excited states of ${}_{}{}^{34}{}_{}{}^{}\mathrm{P}$, and from the cascade 1178.52(16)-keV transition. The three $\gamma$ rays decay with a common half-life of 2.77 ± 0.20 sec. Relative $\gamma$-ray intensities indicate a 100% $\beta$-ray branch to the 1608-keV level, and the $\gamma$-ray branches of that level are determined. No information is obtained on a possible ${}_{}{}^{34}{}_{}{}^{}\mathrm{Si}$ ground-state $\beta$-ray branch. From analysis of the $\beta$-ray energy spectrum, a mass excess of - 19850 ± 300 keV is determined for ${}_{}{}^{34}{}_{}{}^{}\mathrm{Si}$. Comparison with theoretical mass predictions is made.