Electric quadrupole channel of the 7.8 eV 229 Th transition

@article{Bilous2018ElectricQC,
  title={Electric quadrupole channel of the 7.8 eV 229 Th transition},
  author={Pavlo V. Bilous and Nikolay Minkov and Adriana P'alffy},
  journal={Physical Review C},
  year={2018},
  volume={97},
  pages={044320}
}
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… 

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References

SHOWING 1-10 OF 77 REFERENCES
Reduced Transition Probabilities for the Gamma Decay of the 7.8 eV Isomer in ^{229}Th.
TLDR
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 and support new directions in the experimental search of the^{229]Th transition frequency for the development of a future nuclear frequency standard.
Quantum interference effects in an ensemble of $^{229}$Th nuclei interacting with coherent light
As a unique feature, the ${}^{229}$Th nucleus has an isomeric transition in the vacuum ultraviolet that can be accessed by optical lasers. The interference effects occurring in the interaction
Lifetime Measurement of the ^{229}Th Nuclear Isomer.
TLDR
The measurement of the internal-conversion decay half-life of neutral ^{229m}Th has been measured, which is in the range of theoretical predictions and gives further support for an internal conversion coefficient of ≈10^{9}, thus constraining the strength of a radiative branch in the presence of internal conversion.
Laser spectroscopic characterization of the nuclear-clock isomer 229mTh
TLDR
The laser spectroscopic investigation of the hyperfine structure of the doubly charged 229mTh ion and the determination of the fundamental nuclear properties of the isomer, namely, its magnetic dipole and electric quadrupole moments, as well as its nuclear charge radius are presented.
Calculation of strongly forbidden $M$1 transitions and $g$-factor anomalies in atoms considered for parity-nonconservation measurements
Currently the interest to study parity non-conservation (PNC) in atoms remains high due to its status as the best low-energy test of the standard model. There is interest in obtaining important
Radiative lifetime and energy of the low-energy isomeric level in $^{229}$Th
We estimate the range of the radiative lifetime and energy of the anomalous, low-energy $3/{2}^{+}(7.8\ifmmode\pm\else\textpm\fi{}0.5$ eV) state in the $^{229}\mathrm{Th}$ nucleus. Our
Results of a Direct Search Using Synchrotron Radiation for the Low-Energy (229)Th Nuclear Isomeric Transition.
TLDR
A direct search for the (229)Th-doped LiSrAlF(6) crystals is performed by exposing them to tunable vacuum-ultraviolet synchrotron radiation and observing any resulting fluorescence, finding no evidence for the thorium nuclear transition between 7.3 eV and 8.8 eV.
Nuclear laser spectroscopy of the 3.5 eV transition in Th-229
We propose high-resolution laser spectroscopy of the 3.5 eV nuclear transition in Th-229 in isolated atoms. Laser excitation of the nucleus can be detected efficiently in a double-resonance method by
Nuclear collective motion with a coherent coupling interaction between quadrupole and octupole modes
A collective Hamiltonian for the rotation-vibration motion of nuclei is considered in which the axial quadrupole and octupole degrees of freedom are coupled through the centrifugal interaction. The
...
...