Precision measurement of the electron energy-loss function in tritium and deuterium gas for the KATRIN experiment
Name
10052_2021_Article_9325.pdf
Size
3.77 MB
Format
Adobe PDF
Checksum (MD5)
7c92141ca0513d08a6d173f25698aba3
Author(s)
Aker, M.
Beglarian, A.
Behrens, J.
Berlev, A.
Besserer, U.
Bieringer, B.
Block, F.
Bornschein, B.
Bornschein, L.
Böttcher, M.
Date Issued
July 5, 2021
Publisher
Springer Berlin Heidelberg
Citation
The European Physical Journal C. 2021 Jul 05;81(7):579
Version
Final published version
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.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1140/epjc/s10052-021-09325-z
