Artistic rendering inspired by actual images of the IceCube neutrino detectors in Antarctica.
icecube/nsf
Our focus lies in understanding the true nature of the rarest and most energetic cosmic rays, which aids in deciphering their elusive origins.
The universe continuously showers us with bursts of particles. Brian Clark, from the University of Maryland, explains that the most energetic particles are termed ultra-high energy cosmic rays, possessing more energy than particles accelerated in labs. However, they are quite rare. Researchers are still investigating their sources and the constituent particles remain largely unidentified. Clark and his team are now analyzing the composition using data from the IceCube Neutrino detector situated in Antarctica.
Previous detections of ultra-high energy cosmic rays by the Pierre Auger Observatory in Argentina and a telescope array in Utah have led to disagreements. Clark posits that it remains uncertain whether these rays are mainly composed of protons or if they consist of a mix of other particles. The IceCube data sheds light on this, indicating that protons account for about 70% of these rays, with the remainder composed of heavier ions like iron.
Team member Maximilian Meyer from Chiba University in Japan notes that while IceCube data complements other measurements, it primarily detects neutrinos—by-products resulting from collisions between ultra-high-energy cosmic rays and residual photons from the Big Bang. Detecting and simulating neutrinos is inherently challenging.
The characteristics of cosmic ray particles influence how the magnetic fields generated in space affect their trajectories. Thus, comprehending their structure is crucial for the challenging endeavor of tracing their origins, according to Toshihiro Fujii from Osaka Metropolitan University in Japan.
These mysterious origins have given rise to numerous astonishing enigmas, such as the Amaterasu particle cosmic rays. Interestingly, it seems to have originated from a region in space near the Milky Way that lacks clear astronomical candidates for its source.
Clark expresses optimism about solving many of these mysteries within the next decade, as new observational tools, including an upgrade to IceCube, will soon be operational. “This domain has a clear roadmap for how we can address some of these questions,” he states.
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Source: www.newscientist.com
