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The determination of the neutrino mass is still an open issue in particle physics. The calorimetric measurement of the energy released in a nuclear beta decay allows measuring the whole energy, except the fraction carried away by the neutrino: due to the energy conservation, a finite neutrino mass $m_{\nu}$ causes the energy spectrum to be truncated at $Q$– $m_{\nu}$, where $Q$ is the transition...
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