A method for excitation of thorium-229 isomeric nuclei the electron beam irradiation of a solid-state target based on thorium silicate is considered. The key point for obtaining an effective yield of isomeric nuclei is the generation of secondary electrons with a significant increase in the multiplication factor for electrons that have energies within a range from 1 to 25 keV. Based on numerical simulation and theoretical estimation of the excitation cross section of isomeric transition in inelastic scattering, the yield function of isomeric nuclei was o qualitatively obtained.
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The authors are grateful to the Dr. John Villarrubia from the National Institute of Standards and Technology for the courtesy of offering the JMONSEL software package and for the help in operating with it. The authors are also grateful to D. A. Parekhin for the help in data processing.
This study was supported by the Russian Science Foundation, project no. 18-79-00257.
The authors declare that they have no conflicts of interest.
Translated by E. Smirnova
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Borisyuk, P.V., Chubunova, E.V., Lebedinskii, Y.Y. et al. ThSi10O22 Compound as Target for Production of Isomeric Thorium-229 Nuclei at Electron Beam Irradiation. Phys. Atom. Nuclei 83, 1313–1319 (2020). https://doi.org/10.1134/S1063778820090021
- low isomeric level
- VUV nuclear transition
- nuclear clock
- nuclear excitation by electrons