Levels of 178Hf populated in the decay of sup(178m,g)Lu

Decay of sup(178m,g)Lu has been studied by using Ge(Li), NaI(Tl) and plastic detectors. Sources were prepared by the 179Hf(γ,p)sup(178m,g)Lu reaction. Thirty-nine of forty γ-rays are assigned to the 178Hf level scheme, which includes six newly observed levels at 1174.4(Isup(n)K=2+2), 1199.3(0+0), 1276.8(2+0) and 1322.4(3-2) keV in the sup(178g)Lu decay and at 1364.04(9-8) and 1601.6(10-8) keV in the sup(178m)Lu decay. Q sub(β) values are 2.05+-0.05 MeV for sup(178g)Lu and 2.25+-0.03 MeV for sup(178m)Lu. The most probable spin-parity assignments of 1+ and 9- are proposed for the ground and isomeric states of 178Lu, respectively. There is reasonable agreement between the experimental β branching ratios from sup(178m)Lu to the 8- band at 1147 keV and the Alaga rules. Discussions on the 178Hf levels are made mainly on the basis of log ft values. (auth.)