Derg R -Faktor des 2+-Rotationsniveaus von Er168

Using the decay of 16.1-day Rh 99 , the half-life of the 90-keV state in Ru" has been measured by observing delayed coincidences for the (354-90)-and the (529-90)-keV cascades. The result, h/2= (20.7=fc0.3) nsec, is very suitable for a measurement of the Larmor precession in this level by means of the time-differential angular-correlation technique. To overcome the difficult problem of correcting for paramagnetic shielding, the g factor was determined with the Ru atoms in three magnetically different environments: (1) with a liquid source, (2) with Ru embedded in a copper lattice, and (3) with Ru dissolved in Ni. In the last case the product gH e H was measured as a function of an external polarizing field, yielding both the g factor and the magnetic hyperfine field of Ru in Ni. The method of using cubic metal lattices [case (2) above] is demonstrated to be a reliable way of measuring g factors of excited nuclear states, as there are no interfering perturbation effects due to time-dependent and/or static quadrupole interactions. The final result for the g factor is g= -0.189±0.004, which gives, with a spin of § for the 90-keV level, a magnetic moment of JJL=-0.284±0.006 nm. Paramagnetic shielding in liquid sources of transition elements is discussed, and g factors previously determined for such sources are shown to be in doubt by 5 to 10%.

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“…Our result, combined with Kistner and Segnan's ratio, gives a ground-state magnetic moment of /*=-0.623 (19) for Ru".…”

Section: The G Factor: Discussionmentioning

confidence: 51%

gFactor of the 90-KeV Level inRu99and the Paramagnetic Correction in Transition Atoms

1965

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Multipole mixing ratios of transitions in168Er

Behar

Quinones

1975

Z Physik A

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Abstract. Time-integral and time-differential 7-Y directional correlation measurements were performed for cascades in 168Er populated from the electron-capture decay of 168Tm(87d). The ~68Tm source was dissolved in HF acid to minimize extranuclear perturbations. The results of the time-differential experiment for the 448-99.3 keV and 448-198 keV cascades showed agreement with time dependent interaction and gave 22 (1094)

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