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The directional correlation of the 368-kev and the 159-kev γ rays of 44-min Hg¹⁹⁹ were studied with sources in the form of liquid metal, frozen metal, and dry crystalline HgCl₂. The results in the liquid metal, if free of scattering and of disturbances in the intermediate state, indicate a mixing of 0.8% $E5$ with the predominantly $M4$ first γ ray, assuming the second to be pure $E2$. The disturbance observed in the frozen metal suggests a static electric quadrupole interaction eQ(∂²V∂z²)h of 593 Mc/sec whereas that in HgCl₂ suggests similar interaction of 1100 Mc/sec for the 2.35-m{μ}sec intermediate state. If the second γ ray is a rotational transition, an intrinsic quadrupole moment determined from the intermediate lifetime can be used together with these values and the coupling observed for Hg²⁰¹ in HgCl₂ to compute the electric quadrupole moment of Hg²⁰¹. The resulting value of 0.46_-0.11+0.28 barn is in excellent agreement with the spectroscopically determined value of 0.45±{}0.04 obtained by Murakawa.
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Pound et al. (1956) studied this question.
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