Precision measurement of the electron energy-loss function in tritium and deuterium gas for the KATRIN experiment

被引：9

作者：

Aker, M. ^{[1
]}

Beglarian, A. ^{[2
]}

Behrens, J. ^{[3
,4
]}

Berlev, A. ^{[5
]}

Besserer, U. ^{[1
]}

Bieringer, B. ^{[6
]}

Block, F. ^{[4
]}

Bornschein, B. ^{[1
]}

Bornschein, L. ^{[3
]}

Boettcher, M. ^{[6
]}

Brunst, T. ^{[7
,8
]}

Caldwell, T. S. ^{[9
,10
]}

Carney, R. M. D. ^{[11
,12
]}

Chilingaryan, S. ^{[2
]}

Choi, W. ^{[4
]}

Debowski, K. ^{[13
]}

Deffert, M. ^{[4
]}

Descher, M. ^{[4
]}

Barrero, D. Diaz ^{[14
]}

Doe, P. J. ^{[15
,16
]}

Dragoun, O. ^{[17
]}

Drexlin, G. ^{[4
]}

Edzards, F. ^{[7
,8
]}

Eitel, K. ^{[3
]}

Ellinger, E. ^{[13
]}

Miniawy, A. El ^{[23
]}

Engel, R. ^{[3
]}

Enomoto, S. ^{[15
,16
]}

Felden, A. ^{[3
]}

Formaggio, J. A. ^{[18
]}

Fraenkle, F. M. ^{[3
]}

Franklin, G. B. ^{[19
]}

Friedel, F. ^{[4
]}

Fulst, A. ^{[6
]}

Gauda, K. ^{[6
]}

Gil, W. ^{[3
]}

Glueck, F. ^{[3
]}

Groh, S. ^{[3
,4
]}

Groessle, R. ^{[1
]}

Gumbsheimer, R. ^{[3
]}

Hannen, V. ^{[6
]}

Haussmann, N. ^{[13
]}

Heizmann, F. ^{[3
,4
]}

Helbing, K. ^{[13
]}

Hickford, S. ^{[4
]}

Hiller, R. ^{[4
]}

Hillesheimer, D. ^{[1
]}

Hinz, D. ^{[3
]}

Hoehn, T. ^{[3
]}

Houdy, T. ^{[7
,8
]}

机构：

[1] Karlsruhe Inst Technol KIT, Tritium Lab Karlsruhe TLK, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany

[2] Karlsruhe Inst Technol KIT, Inst Data Proc & Elect IPE, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany

[3] Karlsruhe Inst Technol KIT, Inst Astroparticle Phys IAP, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany

[4] Karlsruhe Inst Technol KIT, Inst Expt Particle Phys ETP, Wolfgang Gaede Str 1, D-76131 Karlsruhe, Germany

[5] Russian Acad Sci, Inst Nucl Res, 60th October Anniversary Prospect 7a, Moscow 117312, Russia

[6] Westfalische Wilhelms Univ Munster, Inst Kernphys, Wilhelm Klemm Str 9, D-48149 Munster, Germany

[7] Tech Univ Munich, James Franck Str 1, D-85748 Garching, Germany

[8] Max Planck Inst Phys & Astrophys, Fohringer Ring 6, D-80805 Munich, Germany

[9] Univ N Carolina, Dept Phys & Astron, Chapel Hill, NC 27599 USA

[10] Triangle Univ Nucl Lab, Durham, NC 27708 USA

[11] Lawrence Berkeley Natl Lab, Inst Nucl & Particle Astrophys, Berkeley, CA 94720 USA

[12] Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA 94720 USA

[13] Univ Wuppertal, Fac Math & Nat Sci, Dept Phys, Gaussstr 20, D-42119 Wuppertal, Germany

[14] Univ Autonoma Madrid, Dept Quim Fis Aplicada, Campus Cantoblanco, Madrid 28049, Spain

[15] Univ Washington, Ctr Expt Nucl Phys & Astrophys, Seattle, WA 98195 USA

[16] Univ Washington, Dept Phys, Seattle, WA 98195 USA

[17] CAS, Inst Nucl Phys, Vvi, Rez 25068, Czech Republic

[18] MIT, Nucl Sci Lab, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[19] Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA

[20] Univ Paris Saclay, IRFU DPhP, CEA, F-91191 Gif Sur Yvette, France

[21] Univ Paris Saclay, APC, CEA, F-91191 Gif Sur Yvette, France

[22] Max Planck Inst Kernphys, Saupfercheckweg 1, D-69117 Heidelberg, Germany

[23] Humboldt Univ, Inst Phys, Newtonstr 15, D-12489 Berlin, Germany

来源：

EUROPEAN PHYSICAL JOURNAL C | 2021年 / 81卷 / 07期

基金：

美国能源部;

关键词：

HIGH-RESOLUTION; T-2; D-2; SPECTROMETER; SCATTERING;

D O I：

10.1140/epjc/s10052-021-09325-z

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

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.

引用

页数：16

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