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We might have lastly solved an ultra-high-energy cosmic ray puzzle

July 12, 2025
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We might have lastly solved an ultra-high-energy cosmic ray puzzle
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An inventive rendering primarily based on an actual picture of the IceCube neutrino detector on the South Pole

IceCube/NSF

We’re zeroing in on the true composition of the rarest, highest-energy cosmic rays – which might assist reveal their unknown origins.

The universe is consistently showering us with bursts of particles, says Brian Clark on the College of Maryland. Essentially the most energetic amongst them, referred to as ultra-high-energy cosmic rays, have extra power than even the accelerated particles in colliders. They’re additionally uncommon – researchers don’t know what produces them or the place they arrive from. Even the particles that make them up have been an unresolved query. Now Clark and his colleagues have decided their composition utilizing knowledge collected by the IceCube neutrino detector in Antarctica.

Earlier ultra-high-energy cosmic ray detections – by the Pierre Auger Observatory in Argentina and the Telescope Array in Utah – disagree on whether or not these rays principally include protons or if different particles are additionally within the combine, says Clark. IceCube’s knowledge presents some decision: it suggests protons account for under about 70 per cent of ultra-high-energy cosmic rays, whereas the remaining is fabricated from heavy ions equivalent to iron.

Crew member Maximilian Meier at Chiba College in Japan says IceCube’s knowledge is complementary to different measurements, which detect cosmic rays straight. In distinction, IceCube primarily detects particles referred to as neutrinos, that are byproducts of collisions between energetic cosmic rays and photons left over from the massive bang. Neutrinos themselves are difficult to detect and to simulate on a pc, he says.

The particles in cosmic rays decide how spaceborne magnetic fields have an effect on their path by way of area. Understanding their composition is subsequently an vital a part of the troublesome job of trying to find their origins, says Toshihiro Fujii at Osaka Metropolitan College in Japan.

These unknown origins have created some dramatic mysteries such because the Amaterasu particle cosmic ray. Unusually, it appears to have emerged from a area of area close to the Milky Method the place there are “no promising astronomical candidates” for its supply, he says.

Clark says he’s optimistic about resolving many such mysteries inside a decade as a result of a number of new remark devices, together with an IceCube improve, will come on-line within the close to future. “The sector has a very clear imaginative and prescient for the way we get to [answering] a few of these questions,” he says.

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