Belgian American physicist Francis Halzen, aged 82, was named the recipient of the 2026 Nobel Prize in Physics in Stockholm on Tuesday. The award committee acknowledged Halzen for his significant contributions to the IceCube Neutrino Observatory and the discovery of high-energy neutrinos originating from astrophysical sources. Situated at the Amundsen–Scott South Pole Station in Antarctica, the observatory was utilized by Halzen to track neutrinos, often referred to as “ghost particles” due to their ability to pass through matter, including the Earth and human bodies, without leaving a trace.
Eva Olsson from the Royal Swedish Academy of Sciences described these neutrinos as messengers providing information from distant galaxies and shedding light on the processes of exploding stars. The Nobel Physics Prize, which includes a cash award of 12 million Swedish crowns (approximately $1.7 million CAD), is bestowed annually by the Royal Swedish Academy of Sciences.
The IceCube Neutrino Observatory, covering a cubic kilometer, commenced operations in 2011, marking the realization of a vision initiated in the late 1980s for the South Pole observatory. Halzen expressed gratitude for his collaborators over the years, emphasizing the initial skepticism surrounding the project’s success.
Affiliated with the University of Wisconsin–Madison for several decades, Halzen, while attending a conference in Italy, conveyed his delight and surprise at the announcement of the prestigious award. In 2014, Halzen earned the moniker “Neutrino Man” from the U.S.-based Smithsonian magazine when presented with one of its Ingenuity Awards.
Neutrinos, minuscule cosmic particles with an incredibly small mass, are omnipresent and continuously pass through our bodies, emanating from celestial bodies like the sun. Scientists detect these elusive particles through their interactions with matter, generating flashes of light or charged particles.
Halzen’s research focused on a unique group of neutrinos considered cosmic messengers, offering insights into the evolution of the universe. Mark Pearce, chair of the Nobel Committee for Physics, commended Halzen for leading an international team of researchers and engineers, highlighting the groundbreaking advancements in astronomy facilitated by Halzen’s scientific vision.
Plans are underway for an extension of the observatory, IceCube-Gen2, which will encompass eight cubic kilometers of ice and is projected to be operational by 2033. Halzen emphasized that the full impact of his work is yet to be revealed, underscoring the anticipation for further discoveries in astronomy.
Belgian Prime Minister Bart De Wever congratulated Halzen for his dedication to unraveling the mysteries of the cosmos through the study of neutrinos. The Swedish academy acknowledged the discovery of neutrino oscillations in 2015, with Canadian scientist Dr. Arthur McDonald sharing the Nobel physics prize that year.
The Nobel Prize in Chemistry will be announced on Wednesday, followed by the literature prize on Thursday and the peace prize on Friday. The economics prize winner will be revealed on October 12. Alfred Nobel, the inventor of dynamite, established the Nobel prizes to honor those who have made significant contributions to humanity, with the laureates receiving their awards on December 10, the anniversary of Nobel’s death.