The Pierre Auger Observatory in Argentina last year reported that the average mass of cosmic rays was increasing at high energies. However, a research team led by Alexander Kusenko of the University of California, Los Angeles, has formulated an explanation.
The team believes that at low energies, “both protons and nuclei were deflected by the magnetic field and therefore retained in the galaxy for millions of years”. But at high energies, “the protons tended to escape while the heavier, less mobile nuclei hung around“.
I wonder what you guys think?
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