Abstract
Muonic x-ray spectra have been measured for $^{199}\mathrm{Hg}$ and $^{200}\mathrm{Hg}$. From the data we have determined model-independent charge radii and isomer shifts of certain excited nuclear states and have inferred spectroscopic quadrupole moments of excited states for both isotopes. The quadrupole moment of the lowest $\frac{5}{{2}^{\ensuremath{-}}}$ state in $^{199}\mathrm{Hg}$ is found to be positive, in agreement with previous muonic-atom data but in disagreement with a recent M\"ossbauer study. $B(E2)$ values of low-lying excited states have been determined for $^{199}\mathrm{Hg}$. An $E1$ muonic-nuclear resonance has been discovered in $^{200}\mathrm{Hg}$.NUCLEAR STRUCTURE $^{199,200}\mathrm{Hg}$; measured muonic x-ray spectra; deduced monopole and quadrupole charge parameters, isomer shifts.
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