Iridium-194

Abstract

Electromagnetically enriched quantities of ${\mathrm{Ir}}^{193}$ were exposed for time intervals ranging from 0.5 to 2.0 hr on five successive occasions in the Brookhaven pile. The 19-hour ${\mathrm{Ir}}^{194}$ was found to emit gamma rays of energies 0.295, 0.325, 0.635, 0.640, 0.93, 1.14, 1.28, 1.45, 1.58, 1.77, and ∼2.00 Mev. By coincidence studies, cascade relationships were established between ten pairs of gamma rays. The first and second excited states of the residual nucleus were located at 325 and 620 kev. The angular correlation function of the 0.295 Mev—0.325 Mev cascade was measured and found to correspond to a 2→2→0 distribution, thus giving the spins of the first two excited states of ${\mathrm{Pt}}^{194}$.