STOCKHOLM (The Associated Press) — Francis Halzen has been awarded the 2026 Nobel Prize in Physics for his pioneering contributions to the IceCube Neutrino Observatory and the discovery of high-energy neutrinos of astrophysical origin. The Royal Swedish Academy of Sciences announced the prize in Stockholm, recognizing decades of scientific vision that established a new window into the distant universe.
Speaking by phone from Italy during a broadcast news conference, Halzen called the honor a great surprise. “It was a great surprise and I obviously didn’t expect it,” he said, adding that while predicted by others, the announcement felt surreal. He also noted that he is currently working on a new research proposal and joked that winning the prize might help secure its approval.
Born in Belgium and affiliated with the University of Wisconsin–Madison as the lead institution for IceCube, the 82-year-old physicist spearheaded the development and construction of the massive neutrino detector buried deep within the ice in Antarctica. Mark Pearce, chair of the Nobel Committee for Physics, praised Halzen’s tenacity in a news release (The Associated Press), noting that he led an international team of researchers and engineers to build a fantastic instrument that paved the way for a new kind of astronomy.
Danielle Norcini, a particle physicist at Johns Hopkins University, emphasized Halzen’s role as the driving force behind the project (Ars Technica). She noted that Halzen persevered when conservative physicists were reluctant to join, ultimately transforming humanity’s understanding of the universe by detecting high-energy neutrinos originating from beyond our galaxy.
Neutrinos are extremely abundant subatomic particles with virtually no electrical charge and an almost negligible mass. Often dubbed “ghost particles” due to their reluctance to interact with ordinary matter, trillions of them pass through human bodies every second without leaving a trace. Because they travel largely unimpeded across the cosmos, they carry pristine information from distant astrophysical sources.
Scientists detect these elusive particles by measuring rare collisions with matter that produce flashes of light or charged particles inside specialized detectors like IceCube. This capability has helped inaugurate the field of multimessenger astronomy, combining neutrino observations with traditional electromagnetic telescopes and gravitational-wave detectors to study cosmic phenomena.