NUCLEAR ORIENTATION STUDY OF THE DECAY OF LU-173

A decay study of (LU)-L-173 Oriented at low temperatures in a gadolini um host is carried out. Directional distributions of 12 gamma-rays in Yb-173 are measured using the high-resolution Ge(Li) detectors. The E2 /M1 and M2/E1 multipole mixing ratios of mixed gamma-transitions are d educed. The energies and structure of the rotational band levels in Yb -173, reduced E2 and Ml transition probabilities and E2/M1 mixing rati os are calculated in the framework of the semi-microscopic quasipartic le-phonon model with a Coriolis interaction included. In general, good agreement is obtained between the experimental results and theory. (C ) 1997 Elsevier Science B.V.