Belgian-American physicist, Francis Halzen, at 82 years old, was named the recipient of the 2026 Nobel Prize in Physics in Stockholm on Tuesday. The Nobel committee recognized Halzen for his significant contributions to the IceCube Neutrino Observatory and the groundbreaking discovery of high-energy neutrinos originating from space. The IceCube Neutrino Observatory, situated at the Amundsen–Scott South Pole Station in Antarctica, was the platform for Halzen’s realization that the ice at the South Pole could be utilized to track neutrinos, also known as “ghost particles” for their unique ability to traverse Earth and matter without leaving a trace.
Eva Olsson from the Royal Swedish Academy of Sciences described neutrinos as messengers from the cosmos, providing insights into distant galaxies and the phenomena of exploding stars. The Nobel Physics Prize, which carries a reward of 12 million Swedish crowns ($1.7 million Cdn), is annually awarded by the Royal Swedish Academy of Sciences.
The IceCube, covering a cubic kilometer in space, became operational in 2011 after a vision conceived in the late 1980s. Halzen expressed gratitude for the success of the project, acknowledging the initial skepticism surrounding its feasibility.
Halzen, who has been associated with the University of Wisconsin–Madison for several decades, expressed his delight and surprise at the announcement while attending a conference in Italy. In 2014, Halzen was dubbed “Neutrino Man” by the U.S.-based Smithsonian magazine when he received one of its Ingenuity Awards.
Neutrinos, small cosmic particles with minuscule mass, are pervasive in the universe, emanating from celestial bodies like stars and continuously passing through our bodies. Scientists rely on detecting the interactions of neutrinos with matter, which produce light flashes or charged particles, to study these elusive particles.
Mark Pearce, chair of the Nobel Committee for Physics, praised Halzen for leading an international team that created a groundbreaking instrument for studying neutrinos, opening new avenues in astronomy. An extension of the IceCube Observatory, named IceCube-Gen2, is in development to cover eight cubic kilometers of ice and is expected to enhance neutrino detection capabilities significantly.
Despite his achievements, Halzen believes the full impact of his work is yet to be revealed and anticipates further discoveries in the realm of astronomy. Belgian Prime Minister Bart De Wever commended Halzen for his dedication to unraveling the mysteries of the cosmos through his scientific endeavors.
The Nobel Prize in Chemistry, literature, and peace will be announced in the upcoming days, with the economics prize scheduled for October 12. Alfred Nobel, the founder of the Nobel prizes, stipulated in his will that the awards should recognize individuals who have made significant contributions to humanity. The laureates will receive their awards on December 10, the anniversary of Nobel’s death.