Bremsstrahlung and Pair Creation: Suppression Mechanisms and How They Affect EHE Air Showers

Details Bremsstrahlung and Pair Creation: Suppression Mechanisms and How They Affect EHE Air Showers Bremsstrahlung and Pair Creation: Suppression Mechanisms and How They Affect EHE Air Showers

1997-12-16

arxiv.org/abs/astro-ph/9712198v3

Astronomy and Astrophysics

Astrophysics

16 pages, including 8 figures

Scientific paper

Most calculations of air shower development have been based on the Bethe-Heitler cross sections for bremsstrahlung and pair production. However, for energetic enough particles, a number of different external factors can reduce these cross sections drastically, slowing shower development and lengthening the showers. Four mechanisms that can suppress bremsstrahlung and pair production cross sections are discussed, and their effect on extremely high energy air showers considered. Besides lengthening the showers, these mechanisms greatly increase the importance of fluctuations in shower development, and can increase the angular spreading of showers.

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