Identification of new beta-delayed gamma rays and a low-spin isomer in Ir-176

The beta(+)/EC decay of doubly odd nucleus Ir-176 has been studied via the Nd-146(Cl-35, 5 eta gamma) heavy ion fusion evaporation reaction at 210 MeV bombarding energy. With the aid of a helium-jet recoil fast tape transport system, the reaction products were transported to a low-background location for measurement. Based on the data analysis, the previously known gamma rays from the decay of Ir-176 are proven. Moreover, three new excited levels and ten new gamma rays are assigned to Os-176. The time spectra of typical gamma rays clearly indicate a long-lived low-spin isomer in Ir-176.