Spectroscopy of cross-conjugate nuclei 46Ti-50Cr and 47V-49Cr near the f7/2-shell band termination

High-spin states in the cross-conjugate pairs of nuclei Ti-46-Cr-50 and V47--Cr-49 have been investigated using the reaction Si-28+Si-nat at laboratory energy of 125 MeV. Coincidence spectra, in some cases gated by char ed 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 31/2- in Ti-46 and Cr-49, and beyond to 17(+) and 35/2(-) in Cr-50 and V-47. Opposite-parity bands in Ti-46 and 47V were observed up to 11- and 31/2(+), respectively. Lifetimes derived from DSAM measurements provide B(E2) and B(M1) values for transitions among the higher levels of each of the nuclei. These are compared with earlier measurements and with f(7/2)- and 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 sd hole.