학술논문
Precision measurement of the electron energy-loss function in tritium and deuterium gas for the KATRIN experiment
Document Type
article
Author
M. Aker; A. Beglarian; J. Behrens; A. Berlev; U. Besserer; B. Bieringer; F. Block; B. Bornschein; L. Bornschein; M. Böttcher; T. Brunst; T. S. Caldwell; R. M. D. Carney; S. Chilingaryan; W. Choi; K. Debowski; M. Deffert; M. Descher; D. Díaz Barrero; P. J. Doe; O. Dragoun; G. Drexlin; F. Edzards; K. Eitel; E. Ellinger; A. El Miniawy; R. Engel; S. Enomoto; A. Felden; J. A. Formaggio; F. M. Fränkle; G. B. Franklin; F. Friedel; A. Fulst; K. Gauda; W. Gil; F. Glück; S. Groh; R. Grössle; R. Gumbsheimer; V. Hannen; N. Haußmann; F. Heizmann; K. Helbing; S. Hickford; R. Hiller; D. Hillesheimer; D. Hinz; T. Höhn; T. Houdy; A. Huber; A. Jansen; C. Karl; J. Kellerer; M. Kleesiek; M. Klein; C. Köhler; L. Köllenberger; A. Kopmann; M. Korzeczek; A. Kovalík; B. Krasch; H. Krause; N. Kunka; T. Lasserre; L. La Cascio; O. Lebeda; B. Lehnert; T. L. Le; A. Lokhov; M. Machatschek; E. Malcherek; M. Mark; A. Marsteller; E. L. Martin; M. Meier; C. Melzer; A. Menshikov; S. Mertens; J. Mostafa; K. Müller; S. Niemes; P. Oelpmann; D. S. Parno; A. W. P. Poon; J. M. L. Poyato; F. Priester; P. C.-O. Ranitzsch; R. G. H. Robertson; W. Rodejohann; C. Rodenbeck; M. Röllig; C. Röttele; M. Ryšavý; R. Sack; A. Saenz; P. Schäfer; A. Schaller (née Pollithy); L. Schimpf; K. Schlösser; M. Schlösser; L. Schlüter; S. Schneidewind; M. Schrank; B. Schulz; C. Schwachtgen; M. Šefčík; H. Seitz-Moskaliuk; V. Sibille; D. Siegmann; M. Slezák; M. Steidl; M. Sturm; M. Sun; D. Tcherniakhovski; H. H. Telle; L. A. Thorne; T. Thümmler; N. Titov; I. Tkachev; N. Trost; K. Urban; K. Valerius; D. Vénos; A. P. Vizcaya Hernández; C. Weinheimer; S. Welte; J. Wendel; J. F. Wilkerson; J. Wolf; S. Wüstling; W. Xu; Y.-R. Yen; S. Zadoroghny; G. Zeller
Source
European Physical Journal C: Particles and Fields, Vol 81, Iss 7, Pp 1-16 (2021)
Subject
Language
English
ISSN
1434-6044
1434-6052
1434-6052
Abstract
Abstract 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 $$\upbeta $$ β -decay endpoint region with a sensitivity on $$m_\nu $$ m ν of 0.2 $$\hbox {eV}/\hbox {c}^2$$ eV / c 2 (90% CL). For this purpose, the $$\upbeta $$ β -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 $$\upbeta $$ β -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% $$\hbox {T}_2$$ T 2 gas mixture at 30 K, as used in the first KATRIN neutrino-mass analyses, as well as a $$\hbox {D}_2$$ D 2 gas mixture of 96% purity used in KATRIN commissioning runs. The achieved precision on the energy-loss function has abated the corresponding uncertainty of $$\sigma (m_\nu ^2)< {{10}^{-2}}{\hbox {eV}^{2}}$$ σ ( m ν 2 ) < 10 - 2 eV 2 [1] in the KATRIN neutrino-mass measurement to a subdominant level.