The nuclear Larmor precession has been observed for the 2 +, 4 + and 6 + rotational states of ls4W in the hyperfine field of WFge by application of the TDPAC and the IPAC techniques. A carrier free radioactive source of lS4mRe alloyed with high purity iron was used for all three measurements. (5) with the sign convention of Krane and Steffen.

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The g-factor of the 2 + rotational state of 184W was redetermined by an IPAC measurement in an external magnetic field of 9.45 (5)T as: g2+ (184W) = + 0.289 (7).In the evaluation the remeasured half-life of the 2 + state: T1/2 (2 +) = 1.251 (12) ns was used. TDPAC-measurements with a sample of carrierfree 184Re in high purity iron gave the hyperfine fields: A comparison with the hyperfine field known from a spin echo experiment with lS3WgFe leads to the hyperfine anomaly:184W2+ A 183Wg= +0.145(36).The hyperfine splitting observed in a M6ssbauer source experiment with another sample of carrierfree 184"Re in high purity iron indicates that the smaller splitting, measured previously by a M6ssbauer absorber experiment is due to the high tungsten concentration in the absorber. The new value for the g-factor of the 2 + state together with the result of the M6ssbauer experiment allow an improved calibration for our recent investigation of the gR-factors of the 4 + and 6 + rotational states. A detailed investigation of the attenuation of Y-? angular correlations in liquid sources of lS~Re and aS4mRe revealed the reason for erroneous results of early measurements of the 2--gR-factor: The time dependence of the perturbation is not of a simple exponential type. It contains an unresolved strong fast component.

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