NASA NTRS · 19650039390
Very high energy cosmic gamma rays.
Abstract
Collision of cosmic rays and intergalactic gas to produce neutral pions which decay into high energy gamma rays
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Lieber, M., Milford, S. N., Spergel, M. S.. 1965-02-01. Very high energy cosmic gamma rays.. https://ntrs.nasa.gov/citations/19650039390
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