LANL’s 70-year neutrino program traces detection, oscillation, mass limits, and the unsolved sterile neutrino and matter-antimatter puzzles.
Key Takeaways
Reines and Cowan first detected electron antineutrinos at Savannah River Plant in 1956 using a reactor; Reines won the 1995 Nobel Prize.
The solar neutrino deficit (Homestake Mine) was solved by flavor oscillation, confirmed via SAGE and SNO; neutrinos have mass around 1 meV.
Los Alamos’s LSND experiment in the 1990s found hints of sterile neutrinos via short-baseline muon-to-electron neutrino oscillation; MicroBooNE found no confirming signatures in late 2025.
SNO showed all three flavors combined match solar predictions; despite tiny individual mass, neutrinos comprise ~5% of universe mass by number.
Sterile neutrinos remain a live dark matter candidate since active neutrinos (5% mass budget) cannot account for dark matter’s 27%.
