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NOvA neutrino detector records first 3D particle tracks

nova-3d-2-mr.gif
Three dimensional representation of a cosmic ray passing through the NOvA detector. The collaboration uses cosmic rays for calibration of the detector.
Courtesy Fermilab
                                                       

The most powerful neutrino detector in the United States has recorded its first three-dimensional images of particles.Using the first completed section of the NOvA neutrino detector, scientists have begun collecting data from cosmic rays—particles produced by a constant rain of atomic nuclei falling on the Earth’s atmosphere from space.

"It’s taken years of hard work and close collaboration among universities, national laboratories and private companies to get to this point," said Pier Oddone, director of the Department of Energy’s Fermi National Accelerator Laboratory. Fermilab manages the project to construct the detector.

The 6-foot-long completed section of the detector, under construction in Ash River, Minn., has a width and height of 50 feet, about the distance on a basketball court from the end lane to half-court. The completed detector will be 28 times as long

Scientists’ goal for the full detector is to use it to discover properties of mysterious fundamental particles called neutrinos. Neutrinos are as abundant as cosmic rays in the atmosphere, but they have barely any mass and interact much more rarely with other matter. Many of the neutrinos around today are thought to have originated in the big bang.

“The more we know about neutrinos, the more we know about the early universe and about how our world works at its most basic level,” said NOvA co-spokesperson Gary Feldman of Harvard University.

Later this year, Fermilab, outside of Chicago, will start sending a beam of neutrinos 500 miles through the earth to the NOvA detector near the Canadian border. When a neutrino interacts in the NOvA detector, the particles it produces leave trails of light in their wake. The detector records these streams of light, enabling physicists to identify the original neutrino and measure the amount of energy it had.

When cosmic rays pass through the NOvA detector, they leave straight tracks and deposit well-known amounts of energy. They are great for calibration, said Mat Muether, a Fermilab post-doctoral researcher who has been working on the detector.

“Everybody loves cosmic rays for this reason,” Muether said. “They are simple and abundant and a perfect tool for tuning up a new detector.”

The detector at its current size catches more than 3,000 cosmic rays per second. Naturally occurring neutrinos from cosmic rays, supernovae and the sun stream through the detector at the same time. But the flood of more visible cosmic-ray data makes it difficult to pick them out.

Once the upgraded Fermilab neutrino beam starts, the NOvA detector will take data every 1.3 seconds to synchronize with the Fermilab accelerator. Inside this short time window, the burst of neutrinos from Fermilab will be much easier to spot.

The NovA detector will be operated by the University of Minnesota under a cooperative agreement with the U.S. Department of Energy’s Office of Science.

The NOvA experiment is a collaboration of 169 scientists from 19 universities and laboratories in the U.S and another 15 institutions around the world. The scientists are funded by the U.S. Department of Energy, the National Science Foundation and funding agencies in the Czech Republic, Greece, India, Russia and the United Kingdom.

More information at http://www-nova.fnal.gov/