The following g-factors have been derived from time integral measurements of 7-7 angular correlations in the static magnetic hyperfine field of magnetized gadolinium metal probes:= +0.310(19) g(6 +) = + 0.25(21) 4 + g~ 3,1511 keV)= +0.809(27) 158Gd: g(4 +) = +0.409(15).The 5.35 d 156Tb sources were produced by the reaction t 56Gd(d ' 2 n) 156Tb in our cyclotron. A carrier-free 150 y 15STb source was obtained from ISOLDE/CERN. In comparison with the precisely known g-factors of the 2+ states, g(2+, 156Gd)= +0.386(4) and g(21 +, 158Gd)=0.381(4), we observe a large reduction for the 156Gd 4~-state whereas g increases slightly for 15SGd. The half-life of the 4+ state of t58Gd was remeasured as 158Gd: T1/2(4+)= 148(2)ps. A measurement of the rotation in the 4~ state of lS6Gd in external magnetic fields of various strengths up to B~xt=9.5 T did not confirm the anomalous dependence of the magnetic hyperfine field in gadolinium metal on the external field, which has been reported by Persson et al. [29].
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.
The IPAC-method has been used with the external magnetic field of 9.0T of a split coil superconducting magnet and with the internal field of PdF__~e for a measurement of The half-life of the 645 keV state has been redetermined by use of cooled thallium free NaI detectors as T1/2 (645 keY)= 126(2) ps. >7 directional correlations were measured with a system of three large Ge planar diodes for the cascades 443-645 keV, 332-319keV, 393-280keV, and 64-280keV and analyzed in terms of dipole quadrupole mixing ratios of the ?,-lines involved. The spin of the 673 keV state was derived as 1/2 +.
The ~-factor of the 589 keV state of l~TIn has been determined by a measurement of the rotation of the 1,303-273 keV 7-7 directional correlation in an external magnetic field of 9.55(1)T. The result, g3/2(589 keV)= +0.068 (39), contradicts the usual interpretation of the state as the 2p3/2 single proton hole configuration for which the Schmidt value is ga/2-(Schmidt)= +2.53. It favours the interpretation as the first rotational state built up on the single proton [301] 1/2-Nilsson orbit in a strongly deformed core of prolate shape.
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