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Neutral-pion-decay gamma rays from the Galaxy and the interstellar gas content (1973)

Stecker, F. W.

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Publication Date: 2011-08-16

Description: Knowledge of the total gamma-ray production rate per H atom from the decay of neutral pions produced in interstellar cosmic-ray interactions is essential for determining the possible amount of interstellar H2. This production rate is recalculated here using the latest accelerator data on neutral pion production in p-p interactions up to about 1500 GeV. A simple but accurate approximation used here resolves the past disagreement over the magnitude of this rate. An upper limit is obtained of (1.51 plus or minus 0.23) times 10 to the -25th power/sec, consistent with the observed upper limit of 1.6 times 10 to the -25th power/sec.

Keywords: SPACE RADIATION

Type: Astrophysical Journal; 185; Oct. 15

Format: text

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