PoS - Proceedings of Science
Volume 421 - Neutrino Oscillation Workshop (NOW2022) - Session V. Particle Physics in the Cosmos
KATRIN constraints on local relic neutrino background
T. Lasserre
Full text: pdf
Pre-published on: December 28, 2022
Published on:
Abstract
We present a direct search for cosmic relic neutrinos using data acquired during the first two science runs of the KATRIN experiment in 2019. Beta decay electrons originating from a high-purity molecular tritium gas source are analyzed by a high-resolution MAC-E filter near the endpoint at \SI{18.57}{keV}. This measurement is sensitive to a local relic neutrino overdensity ratio of $ \eta < $ \num{9.7e10}/$\alpha$ (\num{1.1e11}/$\alpha$) at a confidence level of 90\% (95\%) with $\alpha=1$ (0.5) for Majorana neutrinos (Dirac). A adjustment of the integrated electron tritium spectrum over a restricted area around the endpoint, taking into account the relic neutrino captures in the tritium source, yields no significant overdensity. This achievement is an improvement of the previous neutrino mass experiments at Los Alamos and Troitsk.
DOI: https://doi.org/10.22323/1.421.0092
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.