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- W1986165075 abstract "Experiments are reported which demonstrate that the sign and magnitude of the quadrupole interaction of excited nuclear states can be reliably determined by means of time-differential $ensuremath{beta}ensuremath{-}ensuremath{gamma}$ directional correlations with radioactive sources embedded in noncubic single crystals. The 828 keV leyel of $^{115}mathrm{In}$ and the 247 keV level of $^{111}mathrm{Cd}$, fed by an allowed and a unique first-forbidden $ensuremath{beta}$ decay, respectively, have been investigated by this method. The coupling constants $frac{{e}^{2}mathrm{qQ}}{h}$ of these levels in Cd metal at 298ifmmode^circelsetextdegreefi{}K, are -146(5) MHz for $^{115}mathrm{In}$ and +125(4) MHz for $^{111}mathrm{Cd}$. The positive coupling constant for $^{111}mathrm{Cd}$ in Cd coupled with a positive quadrupole moment $Q$ of this level implies a positive electric field gradient in Cd confirming recent theoretical predictions. The negative ${e}^{2}mathrm{qQ}$ for the $^{115}mathrm{In}$ level in Cd metal correspondingly indicates a negative $Q$ for this level in conformity with its description as a member of a $K=frac{1}{2}$ rotational band. The paper includes a discussion of the major concepts underlying the various methods available now for determination of the sign of ${e}^{2}mathrm{qQ}$. Also, a detailed account of theoretical formulas necessary to evaluate allowed and forbidden $ensuremath{beta}ensuremath{-}ensuremath{gamma}$ perturbed angular correlations and a brief discussion of the significance of the technique for further studies of nuclear quadrupole effects in materials are given.RADIOACTIVITY $^{115}mathrm{Cd}^{m}$, $^{111}mathrm{Ag}$; measured $ensuremath{beta}ensuremath{-}ensuremath{gamma}(ensuremath{theta})$ in Cd single crystal; deduced $^{115}mathrm{In}$, $^{111}mathrm{Cd}$ levels ${e}^{2}mathrm{qQ}$ and sign in Cd." @default.
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- W1986165075 date "1975-12-01" @default.
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- W1986165075 title "Determination of the sign and magnitude of the nuclear quadrupole interaction byβ−γdirectional correlations" @default.
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- W1986165075 doi "https://doi.org/10.1103/physrevc.12.2022" @default.
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