Physics’ Littlejohn, Snopok, Martinez Part of LBNF/DUNE International Experiment to Understand Neutrinos
Illinois Tech’s Bryce Littlejohn, assistant professor of physics; Pavel Snopok, associate professor of physics; and David Martinez, researcher, are part of a major new experiment to understand neutrinos. Construction began at the Long-Baseline Neutrino Facility (LBNF) in Lead, South Dakota on July 21, of the Deep Underground Neutrino Experiment (DUNE), which will be built and operated by a group of roughly 1,000 scientists and engineers from 30 countries.
When complete, LBNF/DUNE will be the largest experiment ever built in the United States to study the properties of mysterious particles called neutrinos. Unlocking the mysteries of these particles could help explain more about how the universe works and why matter exists at all.
The U.S. Department of Energy’s Fermi National Accelerator Laboratory, located outside Chicago, will generate a beam of neutrinos and send them 1,300 kilometers (800 miles) through the Earth to Sanford Lab, where a four-story-high, 70,000-ton detector will be built beneath the surface to catch those neutrinos.
Scientists will study the interactions of neutrinos in the detector, looking to better understand the changes these particles undergo as they travel across the country in less than the blink of an eye. Ever since their discovery 61 years ago, neutrinos have proven to be one of the most surprising subatomic particles, and the fact that they oscillate between three different states is one of their biggest surprises. That discovery began with a solar neutrino experiment led by physicist Ray Davis in the 1960s, performed in the same underground mine that now will house LBNF/DUNE. Davis shared the Nobel Prize in physics in 2002 for his experiment.
DUNE scientists will also look for the differences in behavior between neutrinos and their antimatter counterparts, antineutrinos, which could give us clues as to why the visible universe is dominated by matter. DUNE will also watch for neutrinos produced when a star explodes, which could reveal the formation of neutron stars and black holes, and will investigate whether protons live forever or eventually decay, bringing us closer to fulfilling Einstein’s dream of a grand unified theory.
But first, the facility must be built, and that will happen over the next 10 years. Now that the first shovel of earth has been moved, crews will begin to excavate more than 870,000 tons of rock to create the huge underground caverns for the DUNE detector. Large DUNE prototype detectors are under construction at European research center CERN, a major partner in the project, and the technology refined for those smaller versions will be tested and scaled up when the massive DUNE detectors are built.
This research is funded by the U.S. Department of Energy Office of Science in conjunction with CERN and international partners from 30 countries. DUNE collaborators come from institutions in Armenia, Brazil, Bulgaria, Canada, Chile, China, Colombia, Czech Republic, Finland, France, Greece, India, Iran, Italy, Japan, Madagascar, Mexico, the Netherlands, Peru, Poland, Romania, Russia, South Korea, Spain, Sweden, Switzerland, Turkey, Ukraine, United Kingdom and the United States.
