Observation of simultaneousg9/2proton and neutron alignment inKr74

High spin states in ${}_{}{}^{74}{}_{}{}^{}\mathrm{Kr}$ were investigated in the reaction ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$ ${(}^{40}$Ca,α,2p${)}^{74}$Kr at 125 and 140 MeV. A new decay scheme was established up to probable spin I=20. The rotational structure was found to be similar to ${}_{}{}^{76}{}_{}{}^{}\mathrm{Kr}$, showing a double alignment in the ground-state band and sidebands with constant moments of inertia. Measured lifetimes using the Doppler-shift attenuation method indicate very collective E2 transitions in the ground-state band.