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- W2019381240 abstract "The results of nuclear magnetic hfs alignment experiments on ${mathrm{Ce}}^{139}$ are presented, and are discussed in relation to those previously obtained for ${mathrm{Ce}}^{141}$ and ${mathrm{Nd}}^{147}$. It is shown that the gamma-ray anisotropies, $ensuremath{epsilon}$, in the case of ${mathrm{Ce}}^{139}$ are consistent with a decay sequence $frac{3}{{2}^{+}}ensuremath{rightarrow}frac{5}{{2}^{+}}ensuremath{rightarrow}frac{5}{{2}^{+}}ensuremath{rightarrow}frac{7}{{2}^{+}}$, the gamma transition being $M1$ with ensuremath{sim}4% admixture of $E2$. Even such a small admixture of $E2$ 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 ${mathrm{Nd}}^{147}$, where ensuremath{sim}3% admixture of $E2$ 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 ${mathrm{Ce}}^{141}$. The similarity of these mixtures (same magnitude and phase $ensuremath{varphi}=0$) may not be fortuitous, since in each case the gamma ray connects levels which are classified by the shell model as ${d}_{frac{5}{2}}$ and ${g}_{frac{7}{2}}$. In the cases of ${mathrm{Ce}}^{141}$ and ${mathrm{Nd}}^{147}$ the ${g}_{frac{7}{2}}$ state lies uppermost and $ensuremath{epsilon}$ is reduced by the $E2$ admixture, whereas $ensuremath{epsilon}$ is increased in ${mathrm{Ce}}^{139}$, where the levels are inverted." @default.
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- W2019381240 title "Alignment of Three Odd-ARare-Earth Nuclei" @default.
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- W2019381240 doi "https://doi.org/10.1103/physrev.101.196" @default.
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