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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F21%3A00544855" target="_blank" >RIV/61389005:_____/21:00544855 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1140/epjc/s10052-021-09325-z" target="_blank" >https://doi.org/10.1140/epjc/s10052-021-09325-z</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1140/epjc/s10052-021-09325-z" target="_blank" >10.1140/epjc/s10052-021-09325-z</a>

Result language

angličtina

Original language name

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

Original language 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 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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10303 - Particles and field physics

Project

<a href="/en/project/LTT19005" target="_blank" >LTT19005: Czech Participation at the International Experiment KATRIN</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

European Physical Journal C

ISSN

1434-6044

e-ISSN

1434-6052

Volume of the periodical

81

Issue of the periodical within the volume

7

Country of publishing house

DE - GERMANY

Number of pages

16

Pages from-to

579

UT code for WoS article

000680861900002

EID of the result in the Scopus database

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