
TY  - JOUR
A1  - Mucke, A 
A1  - Rachen, JP 
A1  - Stanev, Todor 
A1  - Protheroe, RJ 
A1  - Engel, Ralph 
T1  - Photohadronic processes in astrophysical environments
JF  - Publications of the Astronomical Society of Australia
JO  - Publ. Astron. Soc.  Aust.
Y1  - 1999
VL  - 16
IS  - 2
SP  - 160
EP  - 166
KW  - 
UR  - https://doi.org/10.1071/AS99160 
N2  - We discuss the first applications of our newly developed Monte Carlo event generator SOPHIA to multiparticle photoproduction of relativistic protons with thermal and power-law radiation fields. The measured total cross section is reproduced in terms of excitation and decay of baryon resonances, direct pion production, diffractive scattering, and non-diffractive multiparticle production. Non-diffractive multiparticle production is described using a string fragmentation model. We demonstrate that the widely used 'Delta-approximation' for the photoproduction cross section is reasonable only for a restricted set of astrophysical applications. The relevance of this result for cosmic ray propagation through the microwave background and hadronic models of active galactic nuclei and gamma-ray bursts is brie°y discussed. 
ER  -

