LONG-LIVED ISOMERS IN IR-190

Long-lived isomeric states in Ir-190 have been investigated with the O s-192(p,3n)Ir-190 and Os-192(d,4n)Ir-190 reactions using beams of 18-3 1 MeV protons and 27.8 MeV deuterons, respectively. A series of measur ements, including excitation functions, half lives, e(-)gamma coincide nces and e(-)e(-) coincidences, was performed. Five new transitions we re observed, and the results of e(-)gamma and e(-)e(-) coincidences in dicate that these transitions are fed by the 148.7 keV M4 transition t hat depopulates the 11(-) isomer. The previous decay scheme is shown t o be incorrect, and the results allow the ground state parity and mass excess to be determined.