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The propagation and energy losses of ultra high energy cosmic rays
Norwegian University of Science and Technology, Faculty of Natural Sciences and Technology, Department of Physics.
2011 (English)MasteroppgaveStudent thesis
Abstract [en]
This project investigates the propagation of ultra-high energy cosmic ray nuclei and protons. A simulation of the propagation subjecting the particles to energy losses due to cosmological redshift as well as interactions with the extra-galactic background radiation seeks to find the initial conditions at the source which give the best results on Earth compared to the observations of the Pierre Auger Observatory (PAO). The results agree with previous works of the same kind that a chemical composition of medium-weight fits the observed air shower data best. The starting conditions which gave the best results for the air shower characteristics and RMS(Xmax) were dN/dE proportional to E^{-alpha} with alpha = 1.6 for an initial chemical composition of 25% nitrogen and 75% silicon. Other combinations of the medium-weight nuclei also yielded similar results. No starting conditions could accommodate both the observed dN/dE and the air shower data simultaneously. Other works indicate that this might be improved by the implementation of extra-galactic magnetic fields, but it could also indicate that the error margins in the observed data are underestimated
Place, publisher, year, edition, pages
Institutt for fysikk , 2011. , 46 p.
Keyword [no]
ntnudaim:6472, MFY Fysikk,
Identifiers
URN: urn:nbn:no:ntnu:diva-12654Local ID: ntnudaim:6472OAI: oai:DiVA.org:ntnu-12654DiVA: diva2:420743
Supervisors
Available from: 2011-06-04 Created: 2011-06-04

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