Why in News?
The 2026 Nobel Prize in Physics was awarded to Francis Halzen of the University of Wisconsin–Madison, USA, for his decisive contributions to the IceCube Neutrino Observatory and the discovery of high-energy neutrinos of astrophysical origin. The award was announced by the Royal Swedish Academy of Sciences.
About IceCube Neutrino Observatory
Francis Halzen proposed in 1988 that the clear ice at the South Pole could be used to detect neutrinos. The IceCube Neutrino Observatory is a giant neutrino detector embedded in approximately one cubic kilometre of Antarctic ice and equipped with light sensors.
When a neutrino occasionally collides with an atomic nucleus, it produces a small flash of light. Sensors embedded in the glacial ice detect this light and help scientists determine the properties and direction of the neutrino.
About Neutrinos
Neutrinos are electrically neutral subatomic particles that interact extremely weakly with matter. They can pass through the Earth and human bodies almost entirely undetected. Their weak interaction makes them difficult to observe but also allows them to travel enormous cosmic distances without being significantly deflected or losing energy.
High-energy neutrinos are produced in extremely energetic astrophysical environments. Unlike charged cosmic rays, their trajectories are not bent by magnetic fields, allowing them to carry information about their sources and the most energetic processes occurring in the distant universe.
The enormous volume of ice is necessary because high-energy cosmic neutrinos are extremely rare. IceCube was completed in 2011, and researchers subsequently detected high-energy neutrinos, including neutrinos originating from far beyond our Solar System.
Why South Pole?
The South Pole’s ice has many advantages, as it is free from various types of interference and the area is geologically stable, with no earthquakes.
Source: Nobel Prize
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