Alignment of Three Odd-ARare-Earth Nuclei
- 1 January 1956
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 101 (1), 196-200
- https://doi.org/10.1103/PhysRev.101.196
Abstract
The results of nuclear magnetic hfs alignment experiments on are presented, and are discussed in relation to those previously obtained for and . It is shown that the gamma-ray anisotropies, , in the case of are consistent with a decay sequence , the gamma transition being with ∼4% admixture of . Even such a small admixture of has an important effect upon the anisotropy through the interference term. Other factors which might affect the anisotropy are discussed: electron spin-spin interactions are important, whereas reorientation effects due to long lifetimes in the intermediate state are not. Interference is also important in the case of the 92-kev gamma ray following the decay of , where ∼3% admixture of radiation is needed to explain our results. It seems likely also that there is a similar effect in the 142-kev gamma ray following the decay of . The similarity of these mixtures (same magnitude and phase ) may not be fortuitous, since in each case the gamma ray connects levels which are classified by the shell model as and . In the cases of and the state lies uppermost and is reduced by the admixture, whereas is increased in , where the levels are inverted.
Keywords
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