Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-05-22
Mod.Phys.Lett.A22:2593-2603,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, revtex two columns, small changes and more references. Accepted for publication in Modern Physics Letters A
Scientific paper
10.1142/S0217732307022943
We consider the possibility that the particles in the Ultra High Energy Cosmic Rays arriving to Earth might be neutrons instead of protons. We stress that in such case the argument for the GZK cutoff is weaker and that it is conceivable that neutrons would not be affected by it. This scenario would require the neutron to start with an energy larger than the observed one, in order to be able to travel the distances involved, within its proper life-time. It must then loose most of the extra energy through interaction with the galactic dark matter or some other matter in the intergalactic medium.
Sahu Sarira
Sudarsky Daniel
Unánue Adolfo de
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