TeV Particle Astrophysics 2017 (TeVPA 2017)

Antiproton Flux and Antiproton-to-Proton Flux Ratio in Primary Cosmic Rays Measured with AMS on the Space Station

7 Aug 2017, 16:30

15m

Macedonian Room (The Athenaeum)

Oral Cosmic rays Cosmic rays

Speaker

Andreas Bachlechner (Rheinisch-Westfaelische Tech. Hoch. (DE))

Description

Precision measurements by AMS of the antiproton flux and the antiproton-to-proton flux ratio in primary cosmic rays in the absolute rigidity range from 1 to 450 GV are presented based on $3.49 \times 10^5$ antiproton events and $2.42 \times 10^9$ proton events. At $~20$ GV the antiproton-to-proton flux ratio reaches a maximum. Unexpectedly, above 60 GV the antiproton spectral index is consistent with the proton spectral index and the antiproton-to-proton flux ratio shows no rigidity dependence in the rigidity range from $~60$ to $~500$ GV. This unexpected observation requires new explanation of the origin of cosmic ray antiprotons.

Presentation materials

TeVPA_2017_Bachlechner_antip.pdf