Precision measurement of the electron energy-loss function in tritium and deuterium gas for the KATRIN experiment
Creators: name: Aker, M.
name: Beglarian, A.
name: Behrens, J.
name: Berlev, A.
name: Besserer, U.
name: Bieringer, B.
name: Block, F.
name: Bornschein, B.
name: Bornschein, L.
name: Böttcher, M.
name: Brunst, T.
name: Caldwell, T. S.
name: Carney, R. M. D.
name: Chilingaryan, S.
name: Choi, W.
name: Debowski, K.
name: Deffert, M.
name: Descher, M.
name: Barrero, D. Díaz
name: Doe, P. J.
name: Dragoun, O.
name: Drexlin, G.
name: Edzards, F.
name: Eitel, K.
name: Ellinger, E.
name: Miniawy, A. El
name: Engel, R.
name: Enomoto, S.
name: Felden, A.
name: Formaggio, J. A.
name: Fränkle, F. M.
name: Franklin, G. B.
name: Friedel, F.
name: Fulst, A.
name: Gauda, K.
name: Gil, W.
name: Glück, F.
name: Groh, S.
name: Grössle, R.
name: Gumbsheimer, R.
name: Hannen, V.
name: Haußmann, N.
name: Heizmann, F.
name: Helbing, K.
name: Hickford, S.
name: Hiller, R.
name: Hillesheimer, D.
name: Hinz, D.
name: Höhn, T.
name: Houdy, T.
name: Huber, A.
name: Jansen, A.
name: Karl, C.
name: Kellerer, J.
name: Kleesiek, M.
name: Klein, M.
name: Köhler, C.
name: Köllenberger, L.
name: Kopmann, A.
name: Korzeczek, M.
name: Kovalík, A.
name: Krasch, B.
name: Krause, H.
name: Kunka, N.
name: Lasserre, T.
name: La Cascio, L.
name: Lebeda, O.
name: Lehnert, B.
name: Le, T. L.
name: Lokhov, A.
name: Machatschek, M.
name: Malcherek, E.
name: Mark, M.
name: Marsteller, A.
name: Martin, E. L.
name: Meier, M.
name: Melzer, C.
name: Menshikov, A.
name: Mertens, S.
name: Mostafa, J.
name: Müller, K.
name: Niemes, S.
name: Oelpmann, P.
name: Parno, D. S.
name: Poon, A. W. P.
name: Poyato, J. M. L.
name: Priester, F.
name: Ranitzsch, P. C. -O.
name: Robertson, R. G. H.
name: Rodejohann, W.
name: Rodenbeck, C.
name: Röllig, M.
name: Röttele, C.
name: Ryšavý, M.
name: Sack, R.
name: Saenz, A.
name: Schäfer, P.
name: Schaller, A.
name: Schimpf, L.
name: Schlösser, K.
name: Schlösser, M.
name: Schlüter, L.
name: Schneidewind, S.
name: Schrank, M.
name: Schulz, B.
name: Schwachtgen, C.
name: Šefčík, M.
name: Seitz-Moskaliuk, H.
name: Sibille, V.
name: Siegmann, D.
name: Slezák, M.
name: Steidl, M.
name: Sturm, M.
name: Sun, M.
name: Tcherniakhovski, D.
name: Telle, H. H.
name: Thorne, L. A.
name: Thümmler, T.
name: Titov, N.
name: Tkachev, I.
name: Trost, N.
name: Urban, K.
name: Valerius, K.
name: Vénos, D.
name: Hernández, A. P. Vizcaya
name: Weinheimer, C.
name: Welte, S.
name: Wendel, J.
name: Wilkerson, J. F.
name: Wolf, J.
name: Wüstling, S.
name: Xu, W.
name: Yen, Y. -R.
name: Zadoroghny, S.
name: Zeller, G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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 $β$-decay endpoint region with a sensitivity on $m_ν$ of 0.2$\,$eV/c$^2$ (90% CL). For this purpose, the $β$-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 $β$-electrons from elastic and inelastic scattering off tritium molecules within the source. We determined the \linebreak 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% T$_2$ gas mixture at 30$\,$K, as used in the first KATRIN neutrino mass analyses, as well as a 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 $σ(m_ν^2)&lt;10^{-2}\,\mathrm{eV}^2$ [arXiv:2101.05253] in the KATRIN neutrino-mass measurement to a subdominant level.
description: 12 figures, 18 pages; to be submitted to EPJ C