Astrophysical effective cross sections for gamma-ray line production

Details Astrophysical effective cross sections for gamma-ray line production Astrophysical effective cross sections for gamma-ray line production

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....7.2981p&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

Scientific paper

The main difficulty in the calculation of γ-ray line emission and the corresponding data interpretation is that the spectrum of the energetic particles (EPs) which actually interact in the ISM is not the same as the source spectrum, due to energy dependent energy losses and escape times. Here, we show that it is possible to simplify considerably the calculations by working out the propagation of the particles once and for all, using a standard propagation model. This is achieved through a mathematical transformation which introduces the total γ-ray yields of individual particles as a function of their initial energy. We provide these quantities which enable anyone to calculate the γ-ray production induced by EPs with any spectrum and any composition, without having to take particle transport into account and calculate the propagated spectrum oneself.

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