Using high-precision Penning trap mass spectrometry at the Low Energy Beam and Ion Trap facility at the National Superconducting Cyclotron Laboratory we have measured the $Q$ values of the fourth-order forbidden $\beta$ decay and electron capture of ${}^{50}\mathrm{V}$ and the double electron capture $Q$ value of ${}^{50}\mathrm{Cr}$ with the results $Q_{\beta }\left({}^{50}\mathrm{V}\right)=1038.1\left(1\right)$ keV, $Q_{\mathrm{EC}}\left({}^{50}\mathrm{V}\right)=2208.7\left(1\right)$ keV, and $Q_{2\mathrm{EC}}\left({}^{50}\mathrm{Cr}\right)=1170.5\left(1\right)$ keV. In addition, we have measured the atomic masses of ${}^{46,47,49,50}\mathrm{Ti},{}^{50,51}\mathrm{V}$, and ${}^{50,52–54}\mathrm{Cr}$, reducing uncertainties by factors of up to three compared with the most recent atomic mass evaluation $\left(Ame2016\right)$ [Chin. Phys. C 41, 030003 (2017)]. Our results are in good agreement with $Ame2016$ for ${}^{46,47,49,50}\mathrm{Ti}$ and ${}^{50,54}\mathrm{Cr}$ and show deviations of up to $\sim 1\mathrm{keV}\left(2.5\sigma \right)$ for ${}^{50,51}\mathrm{V}$ and ${}^{50,54}\mathrm{Cr}$.

• Received 7 August 2017

DOI:https://doi.org/10.1103/PhysRevC.96.044321