KATRIN: Status and Prospects for the Neutrino Mass and Beyond

Abstract

The Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to measure a high-precision integral spectrum of the endpoint region of T2 beta decay, with the primary goal of probing the absolute mass scale of the neutrino. After a first tritium commissioning campaign in 2018, the experiment has been regularly running since 2019, and in its first two measurement campaigns has already achieved a sub-eV sensitivity. After 1000 days of data-taking, KATRIN's design sensitivity is 0.2 eV at the 90% confidence level. In this white paper we describe the current status of KATRIN; explore prospects for measuring the neutrino mass and other physics observables, including sterile neutrinos and other beyond-Standard-Model hypotheses; and discuss research-and-development projects that may further improve the KATRIN sensitivity.

arXiv commentContribution to Snowmass 2021. 70 pages excluding references; 35 figures. Author list updated June 2023

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• Neutral tritium gas reduction in the KATRIN differential pumping sections
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• A novel ppm-precise absolute calibration method for precision high-voltage dividers
• Background reduction at the KATRIN experiment by the shifted analysing plane configuration
• Suppression of Penning discharges between the KATRIN spectrometers
• Wideband precision stabilization of the -18.6 kV retarding voltage for the KATRIN spectrometer
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Cited by in corpus (1)

• Limits on the cosmic neutrino background