Reduced transition probabilities for the gamma decay of the 7.8 eV isomer in ${}^{229}$Th

Abstract

The reduced magnetic dipole and electric quadrupole transition probabilities for the radiative decay of the ${}^{229}$Th 7.8 eV isomer to the ground state are predicted within a detailed nuclear-structure model approach. We show that the presence and decay of this isomer can only be accounted for by the Coriolis mixing emerging from a remarkably fine interplay between the coherent quadrupole-octupole motion of the nuclear core and the single-nucleon motion within a reflection-asymmetric deformed potential. We find that the magnetic dipole transition probability which determines the radiative lifetime of the isomer is considerably smaller than presently estimated. The so-far disregarded electric quadrupole component may have non-negligible contributions to the internal conversion channel. These findings support new directions in the experimental search of the ${}^{229}$Th transition frequency for the development of a future nuclear frequency standard.

5 pages, 1 figure, supplementary material is available as pdf with the source files, v3 includes small corrections to match the published version, results unchanged

References in corpus (7)

• Direct detection of the 229Th nuclear clock transition
• Proposal for a Nuclear Gamma-Ray Laser of Optical Range
• Lifetime measurement of the ${}^{229}$Th nuclear isomer
• Nuclear clocks based on resonant excitation of gamma-transitions
• Nuclear collective motion with a coherent coupling interaction between quadrupole and octupole modes
• Non-yrast nuclear spectra in a model of coherent quadrupole-octupole motion
• Internal conversion from excited electronic states of ${}^{229}\mathrm{T}h$ ions

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