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Precision measurement of the electron energy-loss function in tritium and deuterium gas for the KATRIN experiment
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SYSNO ASEP 0544855 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Precision measurement of the electron energy-loss function in tritium and deuterium gas for the KATRIN experiment Author(s) Aker, M. (DE)
Beglarian, A. (DE)
Behrens, J. (DE)
Berlev, A. I. (RU)
Besserer, U. (DE)
Bieringer, B. (DE)
Dragoun, Otokar (UJF-V) RID, SAI
Kovalík, Alojz (UJF-V) RID, ORCID, SAI
Lebeda, Ondřej (UJF-V) RID, ORCID, SAI
Ryšavý, Miloš (UJF-V) RID, ORCID, SAI
Šefčík, Michal (UJF-V) ORCID, SAI
Vénos, Drahoslav (UJF-V) RID, SAI, ORCIDNumber of authors 135 Article number 579 Source Title European Physical Journal C. - : Springer - ISSN 1434-6044
Roč. 81, č. 7 (2021)Number of pages 16 s. Publication form Print - P Language eng - English Country DE - Germany Keywords KATRIN ; neutrino ; tritium source Subject RIV BF - Elementary Particles and High Energy Physics OECD category Particles and field physics R&D Projects LTT19005 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Research Infrastructure CANAM II - 90056 - Ústav jaderné fyziky AV ČR, v. v. i. Method of publishing Open access Institutional support UJF-V - RVO:61389005 UT WOS 000680861900002 DOI 10.1140/epjc/s10052-021-09325-z Annotation The KATRIN experiment is designed for a direct and model-independent determination of the effective electron anti-neutrino mass via a high-precision measurement of the tritium beta -decay endpoint region with a sensitivity on m nu of 0.2 eV/c2 (90% CL). For this purpose, the beta -electrons from a high-luminosity windowless gaseous tritium source traversing an electrostatic retarding spectrometer are counted to obtain an integral spectrum around the endpoint energy of 18.6 keV. A dominant systematic effect of the response of the experimental setup is the energy loss of beta -electrons from elastic and inelastic scattering off tritium molecules within the source. We determined the energy-loss function in-situ with a pulsed angular-selective and monoenergetic photoelectron source at various tritium-source densities. The data was recorded in integral and differential modes. The latter was achieved by using a novel time-of-flight technique. We developed a semi-empirical parametrization for the energy-loss function for the scattering of 18.6-keV electrons from hydrogen isotopologs. This model was fit to measurement data with a 95% T2 gas mixture at 30 K, as used in the first KATRIN neutrino-mass analyses, as well as a D2 gas mixture of 96% purity used in KATRIN commissioning runs. The achieved precision on the energy-loss function has abated the corresponding uncertainty of sigma (m nu 2)<10-2eV2 [1] in the KATRIN neutrino-mass measurement to a subdominant level. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2022 Electronic address https://doi.org/10.1140/epjc/s10052-021-09325-z
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