The Astrophysical Journal
The American Astronomical Society
We calculate the composite spectrum of γ-rays resulting from the decay of 56Ni to 56Co to 56Fe throughout the history of the universe. The results for several cosmological models are presented and compared with the Apollo 15 measurements at low resolution of the cosmic background. The radioactivity background is a significant fraction of the total, and several of its features may be detectable.
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