Observation of isomeric states in neutron deficientA∼80nuclei following the projectile fragmentation of92Mo

\ensuremath{\gamma}-ray decays depopulating isomeric states have been observed in a number of very neutron deficient nuclei around $A\ensuremath{\sim}80$ following the projectile fragmentation of a ${}^{92}\mathrm{Mo}$ primary beam. Previously unobserved decays have been identified in the $N=Z+2$ nuclei ${}_{39}^{80}\mathrm{Y}$ and ${}_{41}^{84}\mathrm{Nb}$ and the $N=Z$ nucleus, ${}_{43}^{86}\mathrm{Tc},$ making the latter the heaviest $N=Z$ nucleus to date in which a discrete \ensuremath{\gamma}-ray transition has been assigned. The lifetime of the previously reported ${I}^{\ensuremath{\pi}}={\frac{9}{2}}^{+}$ isomeric state in ${}^{73}\mathrm{Kr}$ has also been measured and a clearer picture of its decay properties has been deduced. Isomeric ratios have been measured and have been interpreted in terms of the yrast or nonyrast nature of the isomeric state.