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How Hamamatsu Photonics’ technology supports IceCube
Exploring the universe through Antarctic ice
Hamamatsu Photonics congratulates Professor Francis Halzen on receiving the prestigious Nobel Prize in Physics for his contributions to the IceCube Neutrino Observatory and the discovery of high-energy neutrinos from cosmic sources.
We also recognize the extraordinary work of the IceCube Collaboration, which has advanced neutrino research and expanded our understanding of the universe. Hamamatsu is honored that its photomultiplier tubes have supported this research.
What is IceCube?
IceCube is a neutrino observatory built deep within the ice sheet at the South Pole. Neutrinos are extremely small particles that travel through space and are difficult to detect because they pass through matter almost undisturbed.
IceCube uses the vast Antarctic ice as part of a giant detector. On the rare occasion that a neutrino interacts with an atomic nucleus in the ice, it can produce a charged particle. As the charged particle travels rapidly through the ice, it emits Cherenkov light. By detecting these faint signals, scientists can investigate the origins of high-energy neutrinos and study some of the universe’s most energetic phenomena.
Antarctica: A natural environment for neutrino observation
Deep beneath the Antarctic surface, the vast expanse of transparent ice is largely shielded from external interference, making it well suited to detecting the extremely faint light associated with neutrinos. The thick, stable ice sheet also enables an observatory of this scale to be installed and operated.
Photodetectors that capture the signals of neutrinos
Hamamatsu photomultiplier tubes (PMTs), embedded in the ice, detect Cherenkov light and convert it into electrical signals for analysis. IceCube consists of 5,160 spherical Digital Optical Modules (DOMs), each equipped with a 10-inch Hamamatsu PMT.
Since full-scale observations with all 86 strings began in 2011, IceCube has successfully detected numerous high-energy neutrinos. Hamamatsu PMTs have also been selected for the IceCube Upgrade project and are being considered for the next-generation IceCube-Gen2 initiative.
Why neutrino research matters: revealing the cosmos and the nature of matter
IceCube is part of Hamamatsu’s long history of supporting neutrino research. Hamamatsu products and technologies have also been used in Kamiokande and Super-Kamiokande and are being used in Hyper-Kamiokande, which is currently under construction.
Neutrino research connects astronomy and particle physics. Because neutrinos interact so rarely, they can travel from the Sun, supernovae, and distant cosmic events with little disturbance, carrying information about places and processes that light-based observations may not reveal. Studying them helps scientists investigate how stars evolve and explode, explore the sources of high-energy particles, and learn more about the universe’s most powerful events. Neutrino observations also help researchers understand the properties of these fundamental particles and how they change as they travel.
Across these observatories, Hamamatsu’s technology helps detect the extremely faint light produced when neutrinos interact with matter. These measurements support research that deepens our understanding of both the cosmos and the fundamental nature of matter.
High Energy Physics (HEP) community site
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