Gyromagnetic ratios of the 4+ and 6+ rotational states of 184W

The nuclear Larmor precession has been observed for the 2+, 4+ and 6+ rotational states of 184W in the hyperfine field of WFe by application of the TDPAC and the IPAC techniques. A carrier free radioactive source of 184sup(m)Re alloyed with high purity iron was used for all three measurements. From the Larmor precession observed in the 2+ state by TDPAC ωsub(L) = 944(15) MHz and the known g-factor the hyperfine field Bsup(hf)sub(300K) = f(WFe) = 69.6(27)T was derived. The deviation from the result of a spin echo experiment with 183WFe extrapolated to room temperature may be caused by the Bohr-Weisskopf effect (hyperfine anomaly). IPAC measurements with the same sample polarized in an external magnetic field of 1.6 T gave for the 4+ and 6+ rotational states: ωsub(L)tau(4+) = 0.0609(22) and ωsub(L)tau(6+) = 0.00707(98). By use of experimental B(E2)-values the gsub(R)-factors were derived as gsub(R)(4+) = +0.276(26) and gsub(R)(6+) = +0.270(43). The directional correlation of the 537-384 keV γ-γ cascade has been analysed in terms of an E1/M2/E3 mixture for the K-forbidden 573 keV transition. We obtained the mixing ratios delta(M2/E1) = +0.086(16), delta(E3/E1) = -0.028(5) with the sign convention of Krane and Steffen. (orig.)