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- W2078283494 abstract "A new calculation of the Galactic diffuse gamma-ray spectrum from the decay of secondary particles produced by interactions of cosmic-ray protons with interstellar matter is presented. The calculation utilizes the modern Monte Carlo event generators, HADRIN, FRITIOF, and PYTHIA, which simulate high-energy proton-proton collisions and are widely used in studies of nuclear and particle physics, in addition to scaling calculation. This study is motivated by the result on the Galactic diffuse gamma-ray flux observed by the EGRET detector on the Compton Gamma-ray Observatory, which indicates an excess above about 1 GeV of the observed intensity compared with a model prediction. The prediction is based on cosmic-ray interactions with interstellar matter, in which secondary pion productions are treated by a simple model. With the improved interaction model used here, however, the diffuse gamma-ray flux agrees rather well with previous calculations within uncertainties, which mainly come from the unobservable demodulated cosmic-ray spectrum in interstellar space. As a possible solution to the excess flux, flatter spectra of cosmic-ray protons have been tested, and we found that the power-law spectrum with an index of about -(2.4 to 2.5) gives a better fit to the EGRET data, although the spectrum is not explained completely." @default.
- W2078283494 created "2016-06-24" @default.
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- W2078283494 date "1997-03-20" @default.
- W2078283494 modified "2023-09-23" @default.
- W2078283494 title "The Galactic Diffuse Gamma‐Ray Spectrum from Cosmic‐Ray Proton Interactions" @default.
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- W2078283494 doi "https://doi.org/10.1086/303785" @default.
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