Isomer in Iridium-193

Abstract

An 80.19-kev transition with a half-life of 11.9 days and $M4$ multipolarity has been observed in a neutron-irradiated sample of iridium. The corresponding isomeric state has been assigned to ${\mathrm{Ir}}^{193}$, which is produced by two successive neutron captures in ${\mathrm{Ir}}^{191}$. A pile-neutron capture cross section of 1500 barns is found for ${\mathrm{Ir}}^{192}$.