New research suggested the Amaterasu ultra-high-energy cosmic ray particle may be an ultraheavy atomic nucleus heavier than iron rather than a simple proton, according to astrophysics reporting. The particle carried extraordinary energy when detected, puzzling scientists about its origin and acceleration mechanism.
Cosmic rays bombard Earth from deep space, with the rarest events exceeding energies achievable in human-built accelerators. Identifying composition helps narrow source candidates such as supernovae, active galactic nuclei or exotic astrophysical environments.
The Amaterasu event was named after a Japanese sun goddess following detection by observatories monitoring extensive air showers. The summary did not cite specific instruments or statistical confidence levels for the nucleus hypothesis.
Ultraheavy nuclei would imply different propagation and magnetic bending en route to Earth compared with protons. Additional detections of similar events would strengthen compositional inferences.
Theorists continue modeling mechanisms capable of imparting such extreme energies.
The Amaterasu ultra-high-energy cosmic ray may be an ultraheavy nucleus heavier than iron rather than a proton, new research suggested. Pinpointing composition could narrow theories about how such extreme particles are accelerated, without observatory names in the summary.
An ultraheavy nucleus heavier than iron is now the leading compositional explanation for the Amaterasu particle.
Ultra-high-energy detections remain rare, making each particle like Amaterasu valuable for astrophysics.
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Sources:
https://www.sciencedaily.com/breaking/