Nuclear levels in Ir-190 studied with the Os-192(p,3n gamma) and Os-192(d,4ne(-)) reactions

Nuclear levels in Ir-190 have been investigated with the Os-192(p,3n gamma) and Os-192(d,4n e(-)) reactions using beams of 18-31 MeV protons and 27.8 TvIeV deuterons, A series of measurements, including excitation, functions, gamma gamma and e(-) e(-)coincidences, and life time measurements, was per formed. From the singles measurements, a total of 140 gamma rays were assig ned as belonging to the Os-192(p,3n)Ir-190 channel. The results of the coin cidence measurements show that many of these Lines are multiplets, Using in formation from a previous isomer study and single-nucleon transfer reaction s, a level scheme is proposed comprising of 112 gamma rays placed between 7 6 levels. It is shown that most of the gamma intensity arises from bands ha ving K-pi greater than or equal to 4(+). Several negative-par ity bands are also proposed. Calculations performed using values of is an element of and gamma characteristic of the region reproduce qualitatively some aspects of the level scheme. (C) 2000 Elsevier Science B.V. All rights reserved.