Orateur
Vincent Tatischeff
(CSNSM)
Description
By using recent measurements of the Galactic cosmic ray composition by the AMS-02, Voyager 1 and SuperTIGER experiments, we have obtained new information on the origin of these energetic particles: they are most likely produced in superbubbles of plasma at millions of degrees that form around massive star clusters. Most of the cosmic-ray particles are accelerated in strong shock waves induced by supernova explosions sweeping across the superbubble plasma. But a small component, which is responsible for the overabundance of 22Ne in the Galactic cosmic ray composition, most probably arises from acceleration of massive star winds in their termination shock.
