Title: Decades of Waiting End for Francis Halzen: the 2026 Physics Nobel Goes to the "Ghost Particle" Hunter
October 7, 2026
The Royal Swedish Academy of Sciences announced on October 6 that the 2026 Nobel Prize in Physics goes to Belgian-American scientist Francis Halzen, 82, a professor at the University of Wisconsin–Madison, for his work creating an Antarctic ice observatory to detect high-energy neutrinos — among the most elusive particles in the universe. "Francis Halzen has led an international team of researchers and engineers who have provided us with a fantastic instrument. His tenacity and scientific vision has paved the way for a new kind of astronomy," said Mark Pearce, chair of the Nobel Committee for Physics.
Halzen admitted at a video press conference that for years, every October brought misery — not for himself, but for his collaborators: he felt he had disappointed the whole IceCube collaboration by not winning the prize they all deserved. "So that problem is finally solved. I'm very grateful for it," he joked. Back in 2014, Smithsonian magazine had already dubbed him "Neutrino Man," saying his experiment "heralds the beginning of a new era in astronomy" — and even published a comic about his life.
Neutrinos are called "ghost particles" for good reason: nearly massless and electrically neutral, billions pass through your fingernail every second without a trace. In 1988 Halzen proposed a wild idea — using pristine Antarctic ice to catch high-energy neutrinos from deep space. He went on to lead a team of more than 450 people across 58 institutions in 14 countries, freezing over 5,000 light sensors into ice up to 2.5 kilometers deep near the Amundsen-Scott South Pole Station. When a rare neutrino collides with the ice, it produces a blue flash of Cherenkov radiation; the sensor network traces the flash back to its cosmic source. In 2013, IceCube confirmed the detection of neutrinos above 30 TeV originating outside the solar system — the first high-energy astrophysical neutrinos ever seen.
Because neutrinos are not deflected by magnetic fields, they fly nearly straight from their violent birthplaces — perfect messengers for cosmic accelerators. "The messengers bring information from the cosmos," said committee member Eva Olsson. "They open the door to distant galaxies and tell us about the processes of exploding stars." Light from supernovae or the supermassive black holes at galactic centers can be blocked; neutrinos pass through everything. Speaking to the committee by phone from a scientific meeting in Italy, Halzen quipped that he hoped the prize would help get a proposal he's working on approved — at 82, still chasing funding and the next experiment.
Sources: Reuters, Associated Press, New Scientist, Phys.org, NobelPrize.org, The Guardian, Al Jazeera