Ranking the masses of the various types of nearly massless neutrinos
Neutrinos are among the most abundant particles in the universe, and they come in different types. However, with no electrical charge and very little mass, they hardly interact with other matter and are very difficult to detect. Experiments to characterise them are fundamental to our understanding of the origin and evolution of the cosmos, and they require very large and very sensitive detectors. Hyper-Kamiokande (Hyper-K) in Japan will be the next generation of an important type of particle detector (large-scale water Cherenkov detectors), an order of magnitude bigger than its predecessor, Super-Kamiokande (Super-K). The EU-funded Hyper-KOD project is working on enhancing the mass ordering sensitivity of Hyper-K through analyses of Super-K data, in order to investigate the mass ordering of the nearly massless neutrinos.
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