26-30 October 2015
Asia/Tokyo timezone

Can we explain AMS-02 antiproton and positron excesses simultaneously?

27 Oct 2015, 15:30
Room 3.4 ()

Room 3.4

Oral presentation High Energy Cosmic rays Cosmic Rays


Dr Kazunori Kohri (KEK)


I explain the excess of the antiproton fraction recently reported by the AMS-02 experiment by considering collisions between cosmic-ray protons accelerated by a local supernova remnant (SNR) and the surrounding dense cloud. The same "pp collisions" provide the right branching fraction to fit the observed positron excess simultaneously without a fine tuning. The supernova happened in relatively lower metalicity than the majorcosmic-ray sources. The cutoff energy of electrons marks the supernova age of ~10^5 years, while the antiproton excess may extend to higher energy. Both antiproton and positron fluxes are completely consistent with our predictions in Fujita, Kohri, Yamazaki and Ioka (2009).

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