# Radiative lifetime and energy of the low-energy isomeric level in $^{229}$Th

@article{Tkalya2015RadiativeLA,
title={Radiative lifetime and energy of the low-energy isomeric level in \$^\{229\}\$Th},
author={E V Tkalya and Christian Schneider and J Jeet and Eric R. Hudson},
journal={Physical Review C},
year={2015},
volume={92},
pages={054324}
}
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 phenomenological calculations are based on the available experimental data for the intensities of $M1$ and $E2$ transitions between excited levels of the $^{229}\mathrm{Th}$ nucleus in the ${K}^{\ensuremath{\pi}}[N{n}_{Z}\mathrm{\ensuremath{\Lambda}}]=5/{2}^{+}[633]$ and $3/{2}^{+}[631]$ rotational bands. We also… Expand

#### Figures and Tables from this paper

Attempt to optically excite the nuclear isomer in 229 Th
• Physics
• 2018
We aim to perform direct optical spectroscopy of the $^{229}\mathrm{Th}$ nuclear isomer to measure its energy and lifetime, and to demonstrate optical coupling to the nucleus. To this end, we developExpand
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
An alternative approach to populate and study the $^{229}$Th nuclear clock isomer
A new approach to observe the radiative decay of the $^{229}$Th nuclear isomer, and to determine its energy and radiative lifetime, is presented. Situated at a uniquely low excitation energy, thisExpand
Excitation of ^{229m}Th at Inelastic Scattering of Low Energy Electrons.
• E. Tkalya
• Physics, Medicine
• Physical review letters
• 2020
The cross section of the time reversed process is large, and as a consequence, the probability of the nonradiative ^{229m}Th decay via the conduction electrons in metal is close to the internal conversion probability in the Th atom. Expand
Excitation of the $^{229}$Th nucleus via a two-photon electronic transition
• Physics
• 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
Energy of the ^{229}Th Nuclear Clock Isomer Determined by Absolute γ-ray Energy Difference.
The low-lying isomeric state of ^{229}Th provides unique opportunities for high-resolution laser spectroscopy of the atomic nucleus and is determined by taking the absolute energy difference between the excitation energy required to populate the 29.2-keV state and the energy emitted in its decay to the isomersic excited state. Expand
Electric quadrupole channel of the 7.8 eV 229 Th transition
• Physics
• 2018
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 widelyExpand
Estimation of radiative half-life of Th229m by half-life measurement of other nuclear excited states in Th229
We perform coincidence measurements between α particles and γ rays from a U source to determine the half-lives of the excited state in a Th nucleus. We first prove that the half-lives of 42.43andExpand
Nuclear resonant scattering experiment with fast time response: Photonuclear excitation of 201 Hg
Nuclear resonant excitation of the 29.19-keV level in $^{229}$Th with high-brilliance synchrotron- radiation and detection of its decay signal, are proposed with the aim of populating the extremelyExpand
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

#### References

SHOWING 1-10 OF 61 REFERENCES
Penetration Effects in Internal Conversion
• Chemistry
• 1966
Publisher Summary The deviation of internal conversion coefficients (ICCs) at gamma transitions occurs as a result of the penetration of atomic electrons into the nucleus. This effect differs fromExpand
"J."
however (for it was the literal soul of the life of the Redeemer, John xv. io), is the peculiar token of fellowship with the Redeemer. That love to God (what is meant here is not God’s love to men)Expand
Phys
• Rev. Lett. 114, 253001
• 2015
Phys
• Rev. Lett. 98, 142501
• 2007
Phys
• Rev. C 68, 034329
• 2003
Sov
• Phys. JETP 72, 387
• 1991
16
• 516
• 2015
New J
• Phys. 17, 053053
• 2015
Phys
• Rev. A 92, 020503(R)
• 2015