From First Tritium Operation of the Karlsruhe Tritium Neutrino Experiment Toward Precise Determination of the Neutrino Mass

Abstract

The Karlsruhe Tritium Neutrino Experiment (KATRIN) aims for a model-independent measurement of the neutrino mass scale with a sensitivity of 0.2 eV/c² (90% confidence limit). This is made possible by using an ultrastable, high-luminosity windowless gaseous tritium source providing 10¹¹ beta decays per second and a high-resolution integrating spectrometer with a resolution of <1 eV. Over the past years, the system was installed at the Tritium Laboratory Karlsruhe and commissioned in various stages while demonstrating the outstanding performance of the magnetic guiding, electron transmission, and stability of individual subsystems. In 2018, the KATRIN beamline was operated with traces of tritium for the very first time. In this campaign, first beta decay spectra could be recorded. This was essential to validate the physics model and the fitting methods of the KATRIN analysis. Furthermore, in the campaign it was demonstrated that the global KATRIN stability of 0.1% in this configuration was successfully reached. Based on these results—as well as those from a subsequent systematic calibration campaign—KATRIN is now performing neutrino mass measurement runs at nominal tritium purity.

Keywords:

• Tritium
• neutrino mass
• KATRIN
• beta decay spectroscopy
• tritium source

Acknowledgments

We acknowledge the support of the Helmholtz Association and Ministry for Education and Research BMBF (5A17PDA, 05A17PM3, 05A17PX3, 05A17VK2, and 05A17WO3) in Germany; Helmholtz Alliance for Astroparticle Physics and Helmholtz Young Investigator Group (VH-NG-1055) in Germany; Ministry of Education, Youth and Sport (CANAM-LM2011019) in Czech Republic, in cooperation with the Joint Institute for Nuclear Research, Dubna, Russia (3+3 grants), 2017–2019; and the U.S. Department of Energy through grants DE-FG02-97ER41020, DE-FG02-94ER40818, DE-SC0004036, DE-FG02-97ER41033, DE-FG02-97ER41041, DE-AC02-05CH11231, DE-SC0011091, and DE-SC0019304 in the United States.