Various Applications of Precision Low-Energy Nuclear Electron Spectrometry in the KATRIN Tritium Neutrino Project

0522003 - ÚJF 2020 RIV RU eng J - Journal Article
Kovalík, Alojz - Inoyatov, A. K. - Vénos, Drahoslav - Zbořil, Miroslav - Dragoun, Otokar - Filosofov, D. V. - Perevoshchikov, L. L. - Lebeda, Ondřej - Ryšavý, Miloš
Various Applications of Precision Low-Energy Nuclear Electron Spectrometry in the KATRIN Tritium Neutrino Project.
Physics of Particles and Nuclei. Roč. 50, č. 6 (2019), s. 683-720. ISSN 1063-7796. E-ISSN 1531-8559
R&D Projects: GA MŠMT LTT19005; GA MŠMT LM2015056
Institutional support: RVO:61389005
Keywords : neutrino mass * KATRIN
OECD category: Particles and field physics
Impact factor: 0.318, year: 2019
Method of publishing: Limited access
https://doi.org/10.1134/S1063779619060030

The energy scale of the main spectrometer in the KATRIN tritium project is required to remain stable within ±60 meV at an electron energy of 18.6 keV for two months in order to reach the intended sensitivity of 0.2 eV for the rest mass of the electron antineutrino. A natural source of reference electrons with an energy of 17824.3 ± 0.5 eV based on K-conversion electrons of the 32-keV nuclear γ-transition in 83mKr from the decay of parent 83Rb was developed for this purpose using precision low-energy nuclear electron spectrometry. The spectroscopic parameters of 83mKr/83Rb sources fabricated by ion implantation into polycrystalline platinum foils were significantly better than the parameters of vacuum-deposited sources. A large-scale study of the influence of the physicochemical environment of atoms of different radioisotopes in various matrices of vacuum-deposited and implanted radioactive sources on the energy of emitted conversion and Auger electrons and on the structure of the corresponding energy spectra was conducted in the process. The possibility of application of photoelectron sources with a metallic converter as sources of reference electrons for the KATRIN project was also considered.
Permanent Link: http://hdl.handle.net/11104/0306534