Abstract
The decay properties of 178g,mLu were studied by using a high resolution Ge(Li) γ-ray spectrometer, and the half lives of the ground and isomeric states (∼300 keV) were determined to be 30±1 and 23±1 min, respectively. The ground state (1+) decays to the ground state (0+) and to the 1st excited state (2+, 93.1 keV) of 178Hf with β-rays of 2.05 MeV (60%, log ft=6.6) and of 1.96 MeV (20%, log ft=6.9), respectively. Weak β-branches from 178gLu to the 1.272 MeV (4%), 1.407 MeV (5%) and 1.440 MeV (10%) levels in 178Hf were also found. The isomeric state (7−) populates two 8− states at 1.147 MeV (85%, log ft=5.35) and 1.479 MeV (15%, log ft=5.6). The γ-rays observed at 332, 88.8, 426, 326, 213.5 and 93.1 keV correspond to the transitions 8−→8−→8+→6+→4+→2+→0+ in 178Hf. The configuration of the ground and isomeric states were considered as 1+, (Remark: Graphics omitted.), and 7−, (Remark: Graphics omitted.), respectively.
