Мақола

Photohadronic Processes in Astrophysical Environments

A. MückeDepartment of Physics and Mathematical Physics, University of Adelaide Adelaide, SA 5005, Australia;J. P. RachenDepartment of Astronomy, Pennsylvania State University, University Park, PA 16802, USA;R. EngelBartol Research Institute, University of Delaware, Newark, DE 19716, USA;R. J. ProtheroeDepartment of Physics and Mathematical Physics, University of Adelaide Adelaide, SA 5005, Australia;Todor StanevBartol Research Institute, University of Delaware, Newark, DE 19716, USA;

1999en

ABI

Аннотация

Abstract 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 ‘Δ-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 briefly discussed.

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Идентификаторлар

DOI: 10.1071/as99160

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