Spectroscopy of cross-conjugate nuclei46Ti–50Crand47V–49Crnear thef7/2-shell band termination

High-spin states in the cross-conjugate pairs of nuclei ${}^{46}{\mathrm{Ti}–}^{50}\mathrm{Cr}$ and ${}^{47}{\mathrm{V}–}^{49}\mathrm{Cr}$ have been investigated using the reaction ${}^{28}{\mathrm{S}\mathrm{i}+}^{\mathrm{nat}}\mathrm{Si}$ at a laboratory energy of 125 MeV. Coincidence spectra, in some cases gated by charged particle detection, allow the yrast level schemes of all four nuclei to be extended, up to the $f_{7/2}$-shell band termination at ${14}^{+}$ and ${\frac{31}{2}}^{-}$ in ${}^{46}\mathrm{Ti}$ and ${}^{49}\mathrm{Cr},$ and beyond to ${17}^{+}$ and ${\frac{35}{2}}^{-}$ in ${}^{50}\mathrm{Cr}$ and ${}^{47}\mathrm{V}.$ Opposite-parity bands in ${}^{46}\mathrm{Ti}$ and ${}^{47}\mathrm{V}$ were observed up to ${11}^{-}$ and ${\frac{31}{2}}^{+},$ respectively. Lifetimes derived from DSAM measurements provide $B\left(E2\mathrm{}\right)\mathrm{}$ and $B\left(M1\mathrm{}\right)\mathrm{}$ values for transitions among the higher levels of each of the nuclei. These are compared with earlier measurements and with $f_{7/2}$- and $\mathrm{fp}$-shell model calculations. No model calculations have been published for the opposite-parity bands, but their level spacing and reduced transition rates support a spectator nature of the $\mathrm{sd}$ hole.