Fermilab Experiment Prepares to Send Its First Neutrinos 450 miles away to Minnesota

Image: NuMI / MINOS Near Detector Construction at Fermilab

Neutrinos are extremely abundant in nature - trillions of them are passing through us at any given moment. They interact with the atoms of ordinary matter so seldom that they can pass through air, water, rocks, or people without a trace. Neutrinos from cosmic rays go through the entire Earth, mysteriously morphing from one kind to another as they travel through space.

The Main Injector Neutrino Oscillation Search (the MINOS experiment) will use neutrinos produced at Fermilab’s Main Injector accelerator to probe the secrets of these elusive subatomic particles: where do they come from, what are their masses and how do they change from one kind to another? When the experiment begins operations, neutrinos in the NuMI (for “Neutrinos at the Main Injector”) beam will travel straight through the earth, from Fermilab to Soudan in 2.5 milliseconds—no tunnel needed. In Minnesota, a 6,000-ton particle detector will search for neutrinos that may have changed from one kind to another during the trip.

The 200-plus MINOS experimenters will use the change from one type of neutrino to another as the key to discovering the neutrino’s secrets. The MINOS experiment involves scientists, engineers, technical specialists and students from 32 institutions in six countries, including Brazil, France, Greece, Russia, the United Kingdom and the United States. The institutions include universities and national laboratories.

Source: Fermilab