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dc.contributor.author
Mollerach, Maria Silvia  
dc.contributor.author
Roulet, Esteban  
dc.date.available
2017-06-06T21:04:41Z  
dc.date.issued
2013-09  
dc.identifier.citation
Mollerach, Maria Silvia; Roulet, Esteban; Magnetic diffusion effects on the Ultra-High Energy Cosmic Ray spectrum and composition; Iop Publishing; Journal Of Cosmology And Astroparticle Physics; 2013; 9-2013; 1-16  
dc.identifier.issn
1475-7516  
dc.identifier.uri
http://hdl.handle.net/11336/17637  
dc.description.abstract
We discuss the effects of diffusion of high energy cosmic rays in turbulent extra-galactic magnetic fields. We find an approximate expression for the low energy suppression of the spectrum of the different mass components (with charge Z) in the case in which this suppression happens at energies below ∼ Z EeV, so that energy losses are dominated by the adiabatic ones. The low energy suppression appears when cosmic rays from the closest sources take a time comparable to the age of the Universe to reach the Earth. This occurs for energies E < Z EeV (B/nG)p lc/Mpc(ds/70 Mpc) in terms of the magnetic field RMS strength B, its coherence length lc and the typical separation between sources ds. We apply this to scenarios in which the sources produce a mixed composition and have a relatively low maximum rigidity (Emax ∼ (2–10)Z EeV), finding that diffusion has a significant effect on the resulting spectrum, the average mass and on its spread, in particular reducing this last one. For reasonable values of B and lc these effects can help to reproduce the composition trends observed by the Auger Collaboration for source spectra compatible with Fermi acceleration.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Iop Publishing  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
Ultra High Energy Cosmic Rays  
dc.subject.classification
Astronomía  
dc.subject.classification
Ciencias Físicas  
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS  
dc.title
Magnetic diffusion effects on the Ultra-High Energy Cosmic Ray spectrum and composition  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2015-10-15T20:01:00Z  
dc.journal.volume
2013  
dc.journal.pagination
1-16  
dc.journal.pais
Reino Unido  
dc.journal.ciudad
Bristol  
dc.description.fil
Fil: Mollerach, Maria Silvia. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina  
dc.description.fil
Fil: Roulet, Esteban. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina  
dc.journal.title
Journal Of Cosmology And Astroparticle Physics  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1088/1475-7516/2013/10/013  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/1475-7516/2013/10/013/meta  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1305.6519