Evidence for a highly deformed oblate0+state in3674Kr

We present the observation of an isomeric decay in the very neutron deficient nucleus ${}_{36}^{74}\mathrm{Kr}.$ The isomer is interpreted as an excited 0${}^{+}$ state, consistent with the long standing prediction of high deformation prolate/oblate shape coexistence in this nucleus. The magnitude of the $E0\mathrm{}$ matrix element deduced for the $0_2^{+}\to 0_1^{+}$ transition gives strong support to the prediction of a highly deformed oblate rotor.