We re-examine the interaction of ultra high energy nuclei with the microwave background radiation. We find that the giant dipole resonance leaves a new signature in the differential energy spectrum of iron sources located around 3 Mpc: A depression before the bump which is followed by the expected cutoff.
ultra high energy nuclei, microwave background radiation
Cosmic rays, Astrophysics, Cosmic background radiation
Anchordoqui, L. A.; Dova, M. T.; Epele, L. N.; and Swain, J. D., "A depression before a bump in the highest energy cosmic ray spectrum" (1998). Physics Faculty Publications. Paper 2. http://hdl.handle.net/2047/d20000355
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