# 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}
}
• Published 2018
• Physics
• Physical Review C
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 $E2… Expand #### Figures and Tables from this paper Internal conversion of the low-energy Th229m isomer in the thorium anion • Physics • 2020 A process of the decay of the anomalously low lying nuclear isomer$^{229m}$Th$(3/2^+,8.28 \pm 0.17$eV) in the Thorium anion (Th$^-$) via the internal conversion (IC) channel is studied. We showExpand Excitation of the Th229 nucleus via a two-photon electronic transition • Physics • Physical Review A • 2019 We investigate the process of nuclear excitation via a two-photon electron transition (NETP) for the case of the doubly charged thorium. The theory of the NETP process has been devised originally forExpand Nuclear Charge Radii of ^{229}Th from Isotope and Isomer Shifts. This work carries out isotope shift calculations in Th^{+} and Th^{2+} including the specific mass shift, using a combination of configuration interaction and all-order linearized coupled-cluster methods and estimates the uncertainty of this approach. Expand Resonant Electronic-Bridge Excitation of the ^{235}U Nuclear Transition in Ions with Chaotic Spectra. • J. Berengut • Physics, Medicine • Physical review letters • 2018 A quantum statistical theory based on many-body quantum chaos is presented to demonstrate that typical values for the electronic factor increase the probability of electronic bridge in ^{235}U^{7+} by many orders of magnitude. Expand The thorium-229 low-energy isomer and the nuclear clock • Physics • 2021 The 229Th nucleus has an isomeric state at an energy of about 8 eV above the ground state, several orders of magnitude lower than typical nuclear excitation energies. This has inspired theExpand Electronic Bridge Excitation in Highly Charged ^{229}Th Ions. It is shown how to implement a promising electronic bridge scheme in an electron beam ion trap starting from a metastable electronic state to efficiently drive the nuclear transition by coupling it to the electronic shell. Expand Energy of the 229Th nuclear clock transition The method combines nuclear and atomic physics measurements to advance precision metrology, and the findings are expected to facilitate the application of high-resolution laser spectroscopy on nuclei and to enable the development of a nuclear optical clock of unprecedented accuracy. Expand Collective effects in Th229 -doped crystals • Physics • Physical Review A • 2018 Vacuum-ultraviolet-transparent crystals have been proposed as host lattice for the coherent driving of the unusually low-lying isomer excitation in$^{229}$Th for metrology and quantum opticsExpand Driven electronic bridge processes via defect states in Th229 -doped crystals Brenden S. Nickerson, ∗ Martin Pimon, Pavlo V. Bilous, 1 Johannes Gugler, Georgy A. Kazakov, Tomas Sikorsky, Kjeld Beeks, Andreas Grüneis, 2 Thorsten Schumm, and Adriana Pálffy 1, †Expand The $$^{229}$$Th isomer: prospects for a nuclear optical clock • Physics • 2020 The proposal for the development of a nuclear optical clock has triggered a multitude of experimental and theoretical studies. In particular the prediction of an unprecedented systematic frequencyExpand #### References SHOWING 1-10 OF 80 REFERENCES Reduced Transition Probabilities for the Gamma Decay of the 7.8 eV Isomer in ^{229}Th. • Physics, Medicine • Physical review letters • 2017 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. Expand Internal conversion from excited electronic states of 229Th ions • Physics • 2017 The process of internal conversion from excited electronic states is investigated theoretically for the case of the vacuum-ultraviolet nuclear transition of$^{229}{\mathrm Th}$. Due to the very lowExpand Quantum interference effects in an ensemble of$^{229}$Th nuclei interacting with coherent light • Physics • 2013 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 interactionExpand Lifetime Measurement of the ^{229}Th Nuclear Isomer. • Physics, Medicine • Physical review letters • 2017 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. Expand Laser-induced electronic bridge for characterization of the 229mTh → 229gTh nuclear transition with a tunable optical laser with a tunable optical laser • Physics • 2018 An alternative method to determine the excitation energy of the$~^{229\rm{m}}\rm{Th}$isomer via the laser-induced electronic bridge is investigated theoretically. In the presence of an optical orExpand Laser spectroscopic characterization of the nuclear-clock isomer 229mTh 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. Expand Calculation of strongly forbidden$M$1 transitions and$g$-factor anomalies in atoms considered for parity-nonconservation measurements • Physics • 2013 Currently the interest to study parity non-conservation (PNC) in atoms remains high due to its status as the best low-energy test of the standard model. There is interest in obtaining importantExpand Radiative lifetime and energy of the low-energy isomeric level in$^{229}$Th • Physics • 2015 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. OurExpand
Results of a Direct Search Using Synchrotron Radiation for the Low-Energy (229)Th Nuclear Isomeric Transition.
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. Expand
Nuclear laser spectroscopy of the 3.5 eV transition in Th-229
• Materials Science
• 2003
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 byExpand