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STEM

Physics Faculty and Students Mining for Neutrino Answers

Monday, March 4, 2024, By Dan Bernardi
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College of Arts and SciencesDepartment of PhysicsfacultyresearchStudents

It takes a really big project to answer questions about some of the tiniest particles in the Universe. At the (DUNE), researchers will install seven-story detectors a mile below ground and shoot a high-energy beam 800 miles through the Earth to record the rare interactions of incredibly tiny subatomic particles called . DUNE recently reached a major milestone as excavation workers finished carving out the future home of the four gigantic particle detectors in Lead, South Dakota.

North Cavern at DUNE.

Digging out three massive caverns to house DUNE detectors was no easy feat as teams of engineers, construction workers and excavators worked 4,850 feet underground to clear out 800,000 tons of rock. The detectors must be deep underground to deflect interference from cosmic ray particles produced by astrophysical sources that constantly bombard Earth’s surface. (Photo courtesy of Matthew Kapust, Sanford Underground Research Facility)

Hosted by the U.S. Department of Energy’s (Fermilab), DUNE scientists will study the behavior of these mysterious particles to solve some big questions about the cosmos, including why all of the “stuff” in the Universe, including stars, planets and people, are made out of matter and not antimatter. Understanding how neutrinos—one of the most fundamental, abundant and lightest subatomic particles with mass—interact may be the key to determining why our Universe exists.

An International Collaboration

The DUNE collaboration includes more than 1,400 scientists from over . Among them are 鶹ƵUniversity physicists from the group. The faculty and student team, led by and , professors in the Department of Physics, have been engaging in hands-on, international research over the past decade to explore the secrets of neutrinos.

The group’s work on various aspects of the DUNE project has been supported by grants from the National Science Foundation and the Department of Energy. On the first detector, which is scheduled to be operational before the end of 2028, 鶹Ƶresearchers were involved in the development and testing of its components. As coordinator of the Anode Plane Assemblies (APAs) working group, Soderberg helped to finalize the design and testing plans of the APAs. These large rectangular planes, covered with thousands of wires, will read out the electrical signals of neutrino interactions.

Whittington’s group researched and developed light sensors for the first detector’s module and investigated how adding small amounts of the element xenon could improve their performance. Former graduate student Kyle Spurgeon also worked on a prototype detector operated at the European Organization for Nuclear Research (CERN) in Switzerland. At CERN he tested several of the technologies that will be installed in the first detector, among them an ultraviolet light sensor that provides critical timing information for many of the neutrino interactions researchers hope to see with DUNE.

“It’ll be exciting to see some version of the technologies that we’ve worked on come online over the next few years,” Whittington says.

How it Works

The massive detectors that 鶹Ƶresearchers helped develop will be directly in the path of a neutrino beam originating from in Illinois.

Deep Underground Neutrino Experiment showing states

The Deep Underground Neutrino Experiment will generate the world’s most intense beam of high-energy accelerator neutrinos at Fermilab in Illinois, and send straight through the earth to mile-deep detectors at the Sanford Underground Research Facility in South Dakota. Neutrinos, which rarely interact with anything, can pass through the earth with no tunnel required. (Photo courtesy of Fermilab/Diana Brandonisio)

By sending protons through a chain of particle accelerators and then into a cylindrical rod of graphite called the “target” at Fermilab, the stream of neutrinos is born. Those neutrinos pass through a detector at Fermilab and then continue on 800 miles (1,300 km) through the Earth to detectors at the mile-deep Sanford Underground Research Facility, allowing researchers to make definitive determinations of neutrino properties. DUNE scientists will specifically study a phenomenon called “neutrino oscillation,” which looks at how the three different types of neutrinos (the electron neutrino, muon neutrino and tau neutrino) change between types—or flavors—as they travel.

Within these detectors, liquid argon serves as both the neutrinos’ target and the medium that transports information about the neutrino-argon interaction to custom sensors and electronics that record the data. Among the data collected are images that visually depict a neutrino colliding with an argon atom, which allows researchers to reconstruct the details of the interaction and learn about the properties of the instigating neutrino.

aftermath of a neutrino interaction

An image showing the aftermath of a neutrino interaction. The neutrino beam entered from the left, without leaving a trail, and one neutrino interacted with a single argon atom, creating a spray of other particles. (Photo courtesy of Fermilab)

Looking to the Future

According to Soderberg, the 鶹Ƶteam’s more recent research has focused on the “Near Detector” for DUNE, which will sit in a smaller underground cavern to be excavated at Fermilab in Illinois. Once online, the Near and Far detectors will allow researchers to do a joint analysis that will shed light on the big questions like whether neutrinos and antineutrinos behave in fundamentally different ways.

Physics graduate student Tom Murphy (right, in orange hard hat) installing the DUNE “Near Detector” prototype.

Physics graduate student Tom Murphy (right, in orange hard hat) installing the DUNE “Near Detector” prototype. (Photo courtesy of Dan Svoboda)

They are currently participating in the construction, operation and analysis of a that is just now being installed at Fermilab.

“This prototype will collect neutrino interaction data and allow us to verify the performance capabilities of the Near Detector technology and ensure we are ready to move to production of the full-size components needed for DUNE,” says Soderberg.

Postdoctoral researcher Luis Zazueta Reyes is currently based at Fermilab and serves as the Deputy Run Coordinator for this prototype’s data taking period, which should start this spring.

Students interested in engaging in hands-on, international research and exploring the secrets of neutrinos can learn more by visiting the group website.

Portions of this article were adapted from a distributed by Fermilab.

  • Author

Dan Bernardi

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