Production of Antiprotons in Interstellar Space by Propagating Cosmic Rays under Conditions of Diffusive Reacceleration

Astronomy and Astrophysics – Astronomy

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Acceleration Of Particles, Ism: Cosmic Rays, Elementary Particles

Scientific paper

The propagation of cosmic rays in the Galaxy is understood as a diffusive process in which the magnetic field irregularities serve as scatter centers. Particles that interact with turbulent magnetic field irregularities can gain energy because of stochastic, second-order, Fermi type of acceleration. We could show that such a propagation scenario, in which the particles are primary preenergized at the outsets and then reaccelerated during propagation, is completely compatible with the observation of cosmic-ray nuclear data, such as cosmic-ray spectra and the secondary/primary ratio of boron/carbon and subiron/iron. In this context, we present here results of the expected interstellar secondary antiproton flux via p + p → bar-p + x interactions in the framework of this diffusive reacceleration model. We can show that the interstellar bar-p spectrum under these conditions looks very different from that calculated in the Standard Leaky Box situation.

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