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Francis Halzen Wins 2026 Nobel Physics Prize for IceCube
Confirmed
In Short: Francis Halzen, a physicist at the University of Wisconsin-Madison, won the 2026 Nobel Prize in Physics for his work on the IceCube Neutrino Observatory.
Francis Halzen, a physicist at the University of Wisconsin-Madison, was awarded the 2026 Nobel Prize in Physics for his pioneering work on the IceCube Neutrino Observatory, which uses a cubic kilometer of Antarctic ice to detect neutrinos from space.
In 2002, scientists at the Sudbury Neutrino Observatory announced they had solved the solar neutrino problem, a breakthrough that paved the way for further neutrino research.
Neutrinos, first proposed by Wolfgang Pauli in 1930, were long believed to have no mass, but they actually have a tiny bit of mass.
Halzen's vision for detecting neutrinos at the South Pole was first presented in 1988, and the IceCube Neutrino Observatory was completed in 2010.
The observatory's first major breakthrough came in 2017 when it detected a high-energy neutrino from a supermassive black hole in the constellation Orion.
IceCube has since detected neutrinos from both inside and beyond the Milky Way, providing new insights into cosmic phenomena such as black holes, galaxies, and neutron stars.
Halzen emphasized that his work was the result of a large collaboration, noting that many talented people joined him despite skepticism from the scientific community.
The Nobel committee praised Halzen for his scientific leadership and vision, stating that his work had transformed our understanding of the universe.
Halzen, 82, received the full prize of 12 million Swedish kronor, about $1.2 million, and will accept it in Stockholm on December 10.
The IceCube Neutrino Observatory has opened up a new field of neutrino astronomy, allowing scientists to detect high-energy neutrinos from beyond our galaxy.
Halzen said the prize was a great surprise, and he hoped it would help get his next research proposal approved.
The observatory's ability to detect neutrinos has provided a new way to investigate some of the universe's most extreme phenomena.
What this adds
IceCube has since detected neutrinos from both inside and beyond the Milky Way, providing new insights into cosmic phenomena such as black holes, galaxies, and neutron stars.
The Nobel committee praised Halzen for his scientific leadership and vision, stating that his work had transformed our understanding of the universe.
Halzen, 82, received the full prize of 12 million Swedish kronor, about $1.2 million, and will accept it in Stockholm on December 10.
Background
Francis Halzen, a physicist at the University of Wisconsin-Madison, was awarded the 2026 Nobel Prize in Physics for his work on the IceCube Neutrino Observatory.
The Nobel Prize in Physiology or Medicine 2026 was awarded to Karl Deisseroth, Peter Hegemann, and Georg Nagel for their work in optogenetics.
What's confirmed
- In 1962, physicists discovered a second type (“flavor”) of neutrino, the muon neutrino.
- Neutrinos were first proposed by Wolfgang Pauli in a 1930 letter to colleagues.
- “This reflects on the really courageous people who joined me in this project when really no respectable conservative physicist would have joined me. But many talented people did, and that’s why I’m here,” he said.
- While the Nobel was awarded to Halzen, he emphasized that his work was the result of a “large collaboration” with other researchers.
- That’s why Isaac Asimov dubbed them “ghost particles.” That low rate of interaction makes neutrinos extremely difficult to detect, but because they are so light, they can escape unimpeded (and thus largely unchanged) by collisions with other particles of matter.
- Francis Halzen of University of Wisconsin-Madison led development of IceCube Neutrino Observatory.
- In 2022, it identified neutrinos streaming from the active galaxy NGC 1068, and in 2023, it produced the first image of the Milky Way made with neutrinos rather than light.
- Halzen, a physicist at the University of Wisconsin-Madison in the U.S., said the work was a massive collaborative effort.
- Funded by the National Science Foundation and completed in December 2010, IceCube opened up the hunt for ghostly neutrinos from the depths of space.
- That is exactly what Hegemann, Nagel and the third Nobel-prize winner, Karl Deisseroth, a psychiatrist and bioengineer at Stanford University in California, went on to do.... and how it’s used, with a cool example: The ability to control nerve cells with light is called optogenetics.
- There’s a clear discussion of the Prize-winning research at The Conversation (click below to read): Scientists who worked out how to control brain cells with light have won this year’s Nobel prize in physiology or medicine.
- Halzen led the development of IceCube at the South Pole, which uses a cubic kilometre of Antarctic ice fitted with light sensors to detect particles called neutrinos.
What's still developing
- John Updike’s 1960 poem, “ Cosmic Gall,” pays tribute to the two most defining features of neutrinos: They have no charge, and for decades, physicists believed they had no mass (they actually have a teeny bit of mass).
- The only time we detected neutrinos from beyond our solar system was in 1987 when a supernova in the Large Magellanic Cloud triggered the detection of a handful of neutrinos at multiple observatories around the globe.
- Halzen, 82, a professor at the University of Wisconsin-Madison, was visiting the city of Turin in northern Italy and spoke to reporters there a day after the Nobel announcement.
- "In fact, the first neural nets appeared in the late 1980s, and I am very proud that I wrote a paper in 1991 proposing to use AI to analyse the data of part of the classical physics experiment," Halzen said.
- The gigantic IceCube Neutrino Observatory near the Amundsen-Scott South Pole station in Antarctica has lowered 86 cables into the ice, the deepest reaching almost 2.5 kilometers down.
- In 2017, a single neutrino hurtled through the observatory, and its path indicated it was coming from the direction of the constellation Orion.
- Along with observations by other telescopes, the neutrino first detected by IceCube provided the first-ever evidence of a source of high-energy cosmic rays, whose origins have been notoriously difficult to pinpoint since their discovery over 100 years ago by 1936 physics Nobel laureate Victor Hess.
- It uses these sensors to detect particles called neutrinos, which travel nearly undisturbed from their sources.
- Asked what this new window might reveal about the universe, he candidly admitted he could not yet say, noting that the main achievement had been proving neutrino astronomy exists.
- “I am shocked and absolutely delighted that Francis was awarded the Nobel this year,” said particle physicist Danielle Norcini of Johns Hopkins University in a statement.
- Neutrinos are the most abundant subatomic particle in the universe, but they very rarely interact with any type of matter.
- As previously reported, neutrinos travel near the speed of light.
Sources
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