Intermediate-energy Coulomb excitation of $^{46}$V, $^{50}$Mn, and $^{54}$Co

The reduced transition strengths $B(E2;0^+_{\mathrm{g.s.} \rightarrow 2^+_1)$ for the $N=Z$ nuclei $^{46}$V, $^{50}$Mn, and $^{54}$Co have been measured via intermediate-energy Coulomb excitation at 60 MeV/nucleon. The $0^+_\mathrm{g.s.}$ and $2^+_1$ states of these $T_z = 0$ nuclei are the $T=1$ analog states of the ground states and $2^+_1$ states of the corresponding $T_z = \pm 1$ nuclei. The present result for $^{54}$Co is combined with the existing $B(E2\uparrow)$ results [1,2] for the corresponding $T = 1$ states in $^{54}$Fe and $^{54}$Ni to test isospin purity in the mass 54 $T=1$ multiplet. [1] S. Raman et al., Atomic Data Nucl. Data Tables \textbf{78}, 1 (2001). [2] K. L. Yurkewicz et al., Phys. Rev. \textbf{C70}, 054319 (2004).