4+ Excited State in Osmium-188

Transitions in ${\mathrm{Os}}^{188}$ excited by the $K$ capture from 41-hour ${\mathrm{Ir}}^{188}$ have been observed at 155, 324, 478, 633, 641, 827, 832, 1205, 1320, 1440, 1560, 1700, 1940, 2055, and 2190 kev. The new transition at 324 kev is in prompt coincidence with the 155-kev transition to the ground state, and an $E2\mathrm{}$ assignment has been made from conversion electron and gamma-ray intensities. It is proposed that this is the transition between a 4+ rotational level in ${\mathrm{Os}}^{188}$ at 479 kev and the 2+ state at 155 kev.