In deep-inelastic collisions of 8 MeV/nucleon ${}^{70}\mathrm{Zn}$ projectiles with ${}^{198}\mathrm{Pt}$, we have found an $8^{+}$ isomer with $T_{1/2}=23\mathrm{}\left(1\right)\mathrm{ns}$ at 4208 keV in ${}^{68}\mathrm{Ni}$; the $\nu g_{9/2}$ $E2\mathrm{}$ effective charge was determined to be $1.5\left(1\right)e$. In ${}^{69}\mathrm{Cu}$, a $19/2^{-}$ isomer with $T_{1/2}=22\mathrm{}\left(1\right)\mathrm{ns}$ at 3691 keV was identified and its decay data were calculated quite accurately by a parameter-free shell model calculation using empirical input parameters. Proton $2p$- $1h$ excitation, fed by another $T_{1/2}=39\mathrm{}\left(6\right)\mathrm{ns}$ isomer at 3827 keV, induces large collectivity in ${}^{69}\mathrm{Cu}$.

• Received 7 June 1999

DOI:https://doi.org/10.1103/PhysRevLett.84.39