New Constraint on the Local Relic Neutrino Background Overdensity with the First KATRIN Data Runs
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F22%3A00559940" target="_blank" >RIV/61389005:_____/22:00559940 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1103/PhysRevLett.129.011806" target="_blank" >https://doi.org/10.1103/PhysRevLett.129.011806</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevLett.129.011806" target="_blank" >10.1103/PhysRevLett.129.011806</a>
Alternative languages
Result language
angličtina
Original language name
New Constraint on the Local Relic Neutrino Background Overdensity with the First KATRIN Data Runs
Original language description
We report on the direct search for cosmic relic neutrinos using data acquired during the first two science campaigns of the KATRIN experiment in 2019. Beta-decay electrons from a high-purity molecular tritium gas source are analyzed by a high-resolution MAC-E filter around the end point at 18.57 keV. The analysis is sensitive to a local relic neutrino overdensity ratio of eta < 9.7 x 10(10)/alpha (1.1 x 10(11)/alpha) at a 90% (95%) confidence level with alpha = 1 (0.5) for Majorana (Dirac) neutrinos. A fit of the integrated electron spectrum over a narrow interval around the end point accounting for relic neutrino captures in the tritium source reveals no significant overdensity. This work improves the results obtained by the previous neutrino mass experiments at Los Alamos and Troitsk. We furthermore update the projected final sensitivity of the KATRIN experiment to eta < 1 x 10(10)/alpha at 90% confidence level, by relying on updated operational conditions.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
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
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review Letters
ISSN
0031-9007
e-ISSN
1079-7114
Volume of the periodical
129
Issue of the periodical within the volume
1
Country of publishing house
US - UNITED STATES
Number of pages
7
Pages from-to
011806
UT code for WoS article
000834755600008
EID of the result in the Scopus database
2-s2.0-85134501147