A differential measurement of the spin rotation of Dy 16~ in the 2+ rotational state was performed by using liquid sources of TbC13 solved in 3M HC1 and applying an external magnetic field of 33500 Gauss. No change of the Larmor precession frequency could be detected within the first 10 9 10 -9 s. It is concluded that the ground state of the electronic shell of Dy +++ is reached in 6. I0-1~ s after the fl-decay of Tb 16~ The value gn = + 0.364+ 0.011 was derived using (r-3)eff = 8.92 a. u. for the 4f-shell of Dy +++. A comparison with the result of COHrN who studied the M6ssbauer-effect in Fe2Dy shows that the value of (r-3)eff must be 10 % larger in this compound. A measurement of the effective magnetic field at the position of the nucleus in a source of terbium metal was performed for different temperatures. It revealed a temperature dependence which is very similar to the paramagnetic susceptibility z(T). We observed a strong attenuation of yy-angular correlations in the 2+ rotational state. For liquid sources of TbC13 solved in 3M HC1 the following attenuation parameters were measured:)`2= (0.122+0.013) 9 109 s-1 24= (0.235-t-0.024)" 109 s -1 .The ratio 24/). 2 deviates from the value which is expected for the attenuation by internal fields of the 4f-electronic shell. Possible reasons are discussed.We derived the following multipole mixtures of y-transitions in the decay of Th16~ +5.2 J (879keV)=+17.7 --2.8 (MI+E2) J (299 keV)=--0.0294-0.005 (El +M2) J (392 keV)=--0.0234-0.007 (El +M2).
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