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How heavy is a neutrino? Race to weigh mysterious particle heats up

Scaffolding to mount inner electrode system in the main spectrometer of KATRIN.

The Karlsruhe Tritium Neutrino (KATRIN) detector uses the radioactive decay of tritium to measure the neutrino’s mass. Credit: KIT/KATRIN Collaboration

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Updates & Corrections

  • Correction 04 March 2024: An earlier version of this article indicated that tritium has three neutrons in its nucleus. It has two. This has now been amended.


  1. Esfahani, A. et al. Phys. Rev. Lett. 131, 102502 (2023).

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