SMuK 2023 – scientific programme

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T: Fachverband Teilchenphysik

T 92: Cosmic Ray IV

T 92.3: Talk

Wednesday, March 22, 2023, 18:00–18:15, POT/0013

Unstable cosmic-ray nuclei constrain low-diffusion zones in the disk — •Hanno Jacobs, Philipp Mertsch, and Vo Hong Minh Phan — TTK RWTH Aachen

Gamma ray halos around pulsars indicate a locally suppressed diffusion coefficient. In the past the impact of those zones on galactic cosmic ray transport has been neglected due to their supposedly small filling fraction. Here we show that the determining factor is not the volume of the low diffusion zones, but the effective time spent in pockets of low diffusivity. We derive an averaged diffusion coefficient in the disc and implement it in a semi-analytical model of cosmic ray transport. Upcoming Beryllium data from the AMS-02 and HELIX experiments will be able to constrain the filling fraction of low diffusion zones at the percent level.