Abstract
The new neutron-deficient iridium isotopes Ir 182, Ir 183 and Ir 184 have been produced by irradiations with the Berkeley heavy-ion linear accelerator. By means of timed chemical separations, NaI scintillation spectrometers and proportional counters, half lives have been determined as follows: Ir 182, 15±1 min; Ir 183, 55±7 min; Ir 184, 3.2±0.2 h. The gamma-ray spectra of Ir 182 and Ir 184 are very complex, each extending above 4 MeV. Positon branches are also seen in both isotopes. Studies of the gamma-ray spectra indicate that the energies of the first and second excited states of Os 182 are slightly higher than the corresponding states in Os 184. These data suggest that there is a maximum in the moment of inertia at Os 184.
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