24.05.2018

    Dmitri Semikoz (Directeur de Recherche CNRS, Paris) demonstrated that the standard static model of galactic cosmic rays  suggested in 1990th came into conflict with a lot of modern experimental data, including variability measurements of the cosmic ray flux in the Galaxy, magnetic field measurements, and a great deal of anomalies in local observations of cosmic rays.

A new model of galactic cosmic rays was presented, which considered their anisotropic propagation and explained numerous anomalies in the experimental data with allowance for the nearest supernova explosion about two million years ago.  In particular, this supernova can account for the excess of positrons and antiprotons above 20 GeV observed in the PAMELA and AMS-02 experiments, inconsistency at the slopes of the spectra of cosmic-ray protons and heavier nuclei in the TeV–PeV energy range, and plateau in the dipole anisotropy of cosmic rays in the energy range of 2 to 50 TeV. It is assumed that this supernova is also responsible for the Fe60 excess observed in the oceanic crust.  

See the full version of the seminar here.