Excitation of ^{229m}Th at Inelastic Scattering of Low Energy Electrons.

  title={Excitation of ^\{229m\}Th at Inelastic Scattering of Low Energy Electrons.},
  author={E. Tkalya},
  journal={Physical review letters},
  volume={124 24},
  • E. Tkalya
  • Published 2020
  • Physics, Medicine
  • Physical review letters
Excitation of the anomalously low lying nuclear isomer ^{229m}Th(3/2^{+},8.28±0.17  eV) in the process of inelastic electron scattering is studied theoretically in the framework of the perturbation theory for the quantum electrodynamics. The calculated cross sections of ^{229m}Th by the extremely low energy electrons in the range 9-12 eV for the Th atom and Th^{1+,4+} ions lie in the range 10^{-25}-10^{-26}  cm^{2}. Being so large, the cross section opens up new possibilities for the effective… Expand
Charge Properties of Thorium Implanted in Silicon Oxide
A study of thorium atoms implanted in silicon oxide was carried out within the density functional theory method. The charge properties of Th in the ThO2:nSiO2 and Th:nSiO2 compounds, where Th acts asExpand
The $$^{229}$$Th isomer: prospects for a nuclear optical clock
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


Lifetime Measurement of the ^{229}Th Nuclear Isomer.
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
Nuclear structure of lowest {sup 229}Th states and time-dependent fundamental constants
The electromagnetic transition between the almost degenerate $5/{2}^{+}$ and $3/{2}^{+}$ states in $^{229}\mathrm{Th}$ is deemed to be very sensitive to potential changes in the fine structureExpand
Internal conversion from excited electronic states of 229Th ions
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
Decay Rate of the Nuclear Isomer ^{229}Th(3/2^{+},7.8  eV) in a Dielectric Sphere, Thin Film, and Metal Cavity.
  • E. Tkalya
  • Materials Science, Medicine
  • Physical review letters
  • 2018
The main decay channels of the anomalous low-energy 3/2^{+}(7.8±0.5  eV) isomeric level of the ^{229}Th nucleus are investigated theoretically, taking into account the effect of media interfaces. Expand
Nuclear isomer excitation in 229 Th atoms by superintense laser fields
Excitation of the isomeric nuclear state 229m Th in the process of thorium atom irradiation by two-color femtosecond pulse of Ti: Sa laser at the fundamental wavelength and second harmonic isExpand
Excitation of the Th229 nucleus via a two-photon electronic transition
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
Reduced Transition Probabilities for the Gamma Decay of the 7.8 eV Isomer in ^{229}Th.
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
Anomalous magnetic hyperfine structure of the Th 229 ground-state doublet in muonic atoms
The magnetic hyperfine (MHF) splitting of the ground and low-energy $3/{2}^{+}\phantom{\rule{0.28em}{0ex}}(7.8\ifmmode\pm\else\textpm\fi{}0.5$ eV) levels in the $^{229}\mathrm{Th}$ nucleus in theExpand
Features of the low-energy level scheme of 229Th as observed in the α-decay of 233U
Abstract The γ-radiation emitted following the α-particle decay of 233 U has been studied using a variety of Ge(Li) spectrometers and a Si(Li) spectrometer system. Analysis of γ-singles and γγExpand
Decay of the low-energy nuclear isomer 229 Th m (3/2 + ,3.5+/-1.0 eV) in solids (dielectrics and metals): A new scheme of experimental research
The decay channels and the half-life of the proposed anomalously low-energy nuclear isomer ${}^{229}{\mathrm{Th}}^{m}{(3/2}^{+},3.5\ifmmode\pm\else\textpm\fi{}1.0 \mathrm{eV})$ in a dielectric and inExpand