New Constraint on the Local Relic Neutrino Background Overdensity with the First KATRIN Data Runs

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

New Constraint on the Local Relic Neutrino Background Overdensity with the First KATRIN Data Runs

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

New Constraint on the Local Relic Neutrino Background Overdensity with the First KATRIN Data Runs

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/LTT19005" target="_blank" >LTT19005: Česká účast v mezinárodním experimentu KATRIN</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Physical Review Letters

ISSN

0031-9007

e-ISSN

1079-7114

Svazek periodika

129

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

011806

Kód UT WoS článku

000834755600008

EID výsledku v databázi Scopus

2-s2.0-85134501147