The Electron Capture in Ho-163 (ECHo) experiment is a large-scale, international research collaboration dedicated to precisely determining the highly elusive mass of #neutrinos through the analysis of radioactive decay.
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https://www.sflorg.com/2026/03/phy03252602.html
ECHo Collaboration: Hunting for the Neutrino Mass with “Cool” Detectors

Current research results are the basis for large-scale experiments to get closer to the mass of “ghost particles”