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Electric quadrupole channel of the 7.8 eV 229Th transition

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Bilous,  Pavlo V.
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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Pálffy,  Adriana
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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1802.08482.pdf
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Citation

Bilous, P. V., Minkov, N., & Pálffy, A. (2018). Electric quadrupole channel of the 7.8 eV 229Th transition. Physical Review C, 97(4): 044320. doi:10.1103/PhysRevC.97.044320.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002E-0682-4
Abstract
The unique isomeric transition at 7.8 eV in $~^{229}\mathrm{Th}$ has a
magnetic dipole ($M1$) and an electric quadrupole ($E2$) multipole mixing. So
far, the $E2$ component has been widely disregarded. Here, we investigate the
nuclear physics nature and the impact of the $E2$ decay channel for the nuclear
coupling to the atomic shell based on the newest theoretical predictions for
the corresponding reduced nuclear transition probabilities. Our results show
that the contribution of the $E2$ channel is dominant or at least of the same
order of magnitude for internal conversion or electronic bridge transitions
involving the atomic orbitals $7p$, $6d$ and $5f$. Notable exceptions are the
internal conversion of the $7s$ electron and the electronic bridge between the
electronic states $7s$ and $7p$, for which the $M1$ component dominates by two
to three orders of magnitude. Caution is therefore advised when considering
isomeric excitation or decay via nuclear coupling to the atomic shell, as the
involved orbitals determine which multipole transition component dominates.