A Two Component Model for Galactic Cosmic Rays

Details A Two Component Model for Galactic Cosmic Rays A Two Component Model for Galactic Cosmic Rays

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprp11005j&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

We propose that the galactic cosmic ray spectrum comprises two components:(a) One due to acceleration in supernova shocks which yields proton spectra of index γ_SN~= 2.68 which cut-off at an energy Ep ~ 10^14 eV and spectra for higher Z nuclei of similar slopes and cut-off energies EZ = ZEp , as demanded by the rigidity dependent cut-off of shock acceleration. (b) An additional component of slope γ2~= 2.6 that consists mainly of protons and extends to an energy E0 ~= 10^18.5 eV, the limiting energy for confining protons within the galaxy. We examine to what extent the current data are consistent with the above decomposition and the recent proposal that the ``knee'' of the cosmic ray spectrum at E ~ 10^15.5 eV is due to new interactions beyond those of the Standard Model of Weak - EM interactions.

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