Propagação e convolução do fluxo primario de raios cosmicos ultra-energeticos segundo a resolução de energia estimada do Observatorio Pierre Auger / Propagation and convolution of the ultra-high energy cosmic ray spectrum due to the estimated energy resolution of the Pierre Auger Observatory

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

In this work, we study the propagation of Ultra-High Energy Cosmic Rays (UHECR) which are injected into the intergalactic medium by sources with flat spatial distribution for several redshifts. The energy spectrum of UHECR observed on the Earth is directly influenced by the energy losses due to both the adiabatic expansion of the universe and interactions with the Cosmic Microwave Background radiation (e-e+ pair production and photoproduction of pions), which cause the so-called Greisen-Zatsepin-Kuzmin (GZK) cutoff. We perform Monte Carlo simulations and also consider a semi-analytical approach and compare the results obtained by each method. Once the propagated primary flux is known, we make a simple estimate of the shape of the Pierre Auger Observatory energy resolution. This resolution is folded with the propagated primary flux again utilizing both methods. The results show the GZK cutoff may be severely smeared and might not be detected as sharp as predicted

ASSUNTO(S)

convolutions (mathematics) chuveiros de raios cosmicos cosmic rays cosmic showers raios cosmicos gzk cutoff convoluções (matematica) corte gzk pierre auger observatory

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