Abstract
Anisotropies of the more intense gamma -rays emitted in the decay of 150Tb have been measured. The 150Tb was oriented by the hyperfine interaction when the terbium activity was included in a gadolinium host which was cooled to millikelvin temperatures. Unambiguous spin assignments have been made for a number of levels and their parities have been deduced. Multipole mixing ratios have been determined for many transitions. In particular, it was found that the 22+ to 21+ transition has delta =2.0+or-0.7 and the 23+ to 21+ transition has delta =7-+13 and from the experimental alpha K value an E0:E2 mixing ratio mod q mod =0.82+or-0.03 was obtained for the latter. The level structure, particularly at lower energies, is characteristic of a vibrational nucleus and is in marked contrast to the neighbouring heavier even-N gadolinium isotopes which span the onset of permanent nuclear deformation.
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