Photodisintegration of Ultra-High-Energy Cosmic Rays revisited

Details Photodisintegration of Ultra-High-Energy Cosmic Rays revisited Photodisintegration of Ultra-High-Energy Cosmic Rays revisited

2004-12-04

arxiv.org/abs/astro-ph/0412109v1

Astropart.Phys. 23 (2005) 191-201

Astronomy and Astrophysics

Astrophysics

16 pages, 8 figures, accepted for publication in Astroparticle Physics

Scientific paper

10.1016/j.astropartphys.2004.12.

Recent microscopic and phenomenological calculations of giant dipole resonances for A <= 56 nuclei are presented. The derived photodisintegration cross sections are exhaustively compared to the photonuclear data available to date. An accurate description of the data is found. Our new calculations are also compared with the previous and widely-used estimates of Puget, Stecker and Bredekamp. The present calculations also include all the possible paths down the nuclear chart. The impact on the photodisintegration of ultra-high-energy cosmic rays (UHECR) is illustrated for a Fe source with typical energies of 10^{20-21} eV. At energies around 10^20 eV, the new cross sections are found to modify the UHECR photodisintegration rates. At energies around 10^21 eV, it is recommended to solve a full reaction network to estimate the photodisintegration rate of the UHECR.

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