Physicists are closer than ever to answering fundamental questions about the origins of the universe by learning more about its tiniest particles.
Scientists are intensifying research into neutrinos, mysterious particles that pass through matter almost unhindered. Key goals include studying how neutrinos change types and searching for previously unknown varieties, which could transform current understanding of physics.
The Mystery of the Sterile Neutrino
University of Cincinnati Professor Alexandre Sousa has detailed the next decade of global research into neutrinos, incredibly tiny particles that travel at nearly the speed of light and pass through virtually everything by the trillions each second.
Neutrinos are the most abundant particles with mass in the universe, making them a key focus for scientists seeking to understand fundamental aspects of physics.
These particles are produced in various processes, including nuclear fusion in the sun, radioactive decay in nuclear reactors and Earth’s crust, and experiments in particle accelerators. As they move, neutrinos can switch between three types, or “flavors,” in a process that continues to intrigue researchers.
But unexpected experimental results made physicists suspect there might be another neutrino flavor, called a sterile neutrino because it appears immune to three of the four known “forces.”
“Theoretically, it interacts with gravity, but it has no interaction with the others, weak nuclear force, strong nuclear force, or electromagnetic force,” Sousa said.
Future Prospects in Neutrino Physics
“Progress in neutrino physics is expected on several fronts,” Zupan said.
Besides the search for sterile neutrinos, Zupan said physicists are looking at several experimental anomalies disagreements between data and theory that they will be able to test in the near future with the upcoming experiments.
Learning more about neutrinos could upend centuries of our understanding about physics. Several neutrino projects have been recognized with the world’s top scientific award, the Nobel Prize, most recently with the discovery of neutrino oscillations receiving the 2015 Nobel Prize in Physics. Countries such as the United States are investing billions of dollars into these projects because of the immense scientific interest in pursuing these questions.
One question is why the universe has more matter than antimatter if the Big Bang created both in equal measure. Neutrino research could provide the answer, Sousa said.
“It might not make a difference in your daily life, but we’re trying to understand why we’re here,” Sousa said. “Neutrinos seem to hold the key to answering these very deep questions.”
DUNE: The Cutting-Edge of Neutrino Experiments
Sousa is part of one of the most ambitious neutrino projects called DUNE or the Deep Underground Neutrino Experiment conducted by the Fermi National Accelerator Laboratory. Crews have excavated the former Homestake gold mine 5,000 feet underground to install neutrino detectors. It takes about 10 minutes just for the elevator to reach the detector caverns, Sousa said.
Researchers put detectors deep underground to shield them from cosmic rays and background radiation. This makes it easier to isolate the particles generated in experiments.
The experiment is set to begin in 2029 with two of its detector modules measuring neutrinos from the atmosphere. But starting in 2031, researchers at Fermilab will shoot a high-energy beam of neutrinos 800 miles through the Earth to the waiting detector in South Dakota and a much closer one in Illinois. The project is a collaboration of more than 1,400 international engineers, physicists, and other scientists.
“With these two detector modules and the most powerful neutrino beam ever we can do a lot of science,” Sousa said. “DUNE coming online will be extremely exciting. It will be the best neutrino experiment ever.”
Website: International Conference on High Energy Physics and Computational Science.
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