Nuclear orientation of 160Tb in Tb single crystal.

Nuclear orientation of {sup 160}Tb in a Tb single crystal has been carried out in order to obtain accurate values of multipole mixing ratios for 22 transitions in {sup 160}Dy. The experimental aspects are described in some detail as they form the basis for obtaining high quality data. Three different methods were used to extract the mixing ratios, and they are shown to agree very well. Our results for both {ital E}1/{ital M}2 and {ital E}2/{ital M}1 transitions are compared to other measurements. The signs and magnitude of the {ital E}1/{ital M}2 mixing ratios cannot be explained on the basis of Coriolis mixing of the {ital K}=0, 1, and 2 bands. Comparison of our results for the 299, 1178, and 1272 keV transitions with those from {gamma}-{gamma} directional correlation measurements indicate that some {ital E}3 admixture may be present in these transitions. The mixing ratios we obtained for the {ital E}2/{ital M}1 transitions are in reasonably good agreement with the predictions of the interacting-boson-approximation-1 model.