+ The **neutrino** is the ghost of the [[Lepton]] family: no [[Electric charge]], almost no [[mass]], and so little appetite for interaction that trillions stream through your body every second without leaving a mark. It is NOT a small [[Neutron]] — the similar names are a historical accident (Fermi's Italian for "little neutral one").+ ## The three flavours++ | flavour | partner lepton |+ |---|---|+ | electron neutrino (νₑ) | [[Electron]] |+ | muon neutrino (ν_μ) | muon |+ | tau neutrino (ν_τ) | tau |++ ## Where they come from++ - Beta decay — every n → p + e⁻ conversion emits one (see [[Neutron]]).+ - The Sun — fusion in the core floods space with them.+ - Reactors, supernovae, and the Big Bang's leftover background.
History of Neutrino
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