Our universe is permeated with neutrinos—nearly massless, neutral particles that interact so rarely with other matter that trillions of them pass through our bodies each second without leaving a trace. These tiny particles, studied in world-leading Fermilab experiments, could be key to a deeper understanding of our universe.
Neutrinos, first discovered in 1956, have some mysterious characteristics. They have puzzlingly low masses, compared to other elementary particles, and they are able to oscillate, or change from one type of neutrino to another.
The Standard Model, the best description of the fundamental particles and forces that make up our universe, predicted the existence of neutrinos. But it also predicted that the lightweight particles would have no mass at all. It could be that neutrinos are the only fundamental particles that gain their mass from a source other than the just-discovered Higgs field.
Neutrinos could have other strange properties as well. They could turn out to be identical to antineutrinos, their antimatter counterparts. They could be related to massive particles that theorists think might have greatly influenced the formation of our universe.
Studying neutrinos could tell us about other areas of physics as well. They could give us insight into why particles seem naturally to be organized into three generations. They could help reveal undiscovered principles of nature.
Scientists at Fermilab have been involved in neutrino research since 1999, when they first broke ground for the MINOS experiment, which studies the oscillation of muon neutrinos to tau neutrinos. The DONUT experiment at Fermilab made the first ever direct observation of a tau neutrino in 2000.
Scientists have proposed a number of other experiments, and have continued to update the MINOS experiment, to learn more about the properties and behaviors of neutrinos.
The Long-Baseline Neutrino Experiment, LBNE, is a proposed international neutrino experiment that would be the largest of its kind. LBNE aims to discover whether neutrinos and antineutrinos interact differently with matter and to determine which type of neutrino is least and most massive.
Fermilab's current flagship neutrino experiment, NOvA sends a beam of neutrinos to a 200-ton particle detector a record-breaking 500 miles away in Minnesota. NOvA aims to study the oscillation of muon neutrinos to electron neutrinos, to determine the ordering of neutrino masses and to discover whether neutrinos and antineutrinos oscillate at different rates.
MicroBooNE is a multiton liquid-argon neutrino detector. MicroBooNE aims to investigate a previously observed, unexpected excess of neutrinos at low energies and to look into the possible existence of a fourth type of neutrino, the sterile neutrino.
MINERvA is a neutrino-scattering experiment that uses a variety of target materials to search for low-energy neutrino interactions. It is designed to study neutrino-nucleus interactions with unprecedented detail.
MINOS is a neutrino oscillation experiment with a far detector located in a former mine in Minnesota. It aims to observe neutrino oscillations by measuring the disappearance of muon neutrinos and the appearance of electron neutrinos.
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