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|Title: ||Fluxes of cosmic rays: a delicately balanced stationary state|
|Other Titles: ||Physics Letters A|
|Authors: ||Borges, Ernesto Pinheiro|
Anjos, João C.
|Keywords: ||Raios cósmicos;Física nuclear|
|Issue Date: ||2003|
|Abstract: ||The analysis of cosmic rays fluxes as a function of energy reveals a knee slightly below 1016 eV and an ankle close to 1019 eV. Their physical origins remain up to now quite enigmatic; in particular, no elementary process is known which occurs at energies close to 1016 eV. We propose a phenomenological approach along the lines of nonextensive statistical mechanics, a formalism which contains Boltzmann–Gibbs statistical mechanics as a particular case. The knee then appears as a crossover between two fractal-like thermal regimes, the crossover being caused by process occurring at energies ten million times lower than that of the knee, in the region of the quark hadron transition (≃109 eV). This opens the door to an unexpected standpoint for further clarifying the phenomenon.|
|Description: ||Texto completo: acesso restrito. p. 372–376|
|Appears in Collections:||Artigos Publicados em Periódicos (FIS)|
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