PAMELA results on the cosmic-ray antiproton flux from 60 MeV to 180 GeV in kinetic energy
PAMELA Collaboration: O. Adriani, G. C. Barbarino, G. A. Bazilevskaya,, R. Bellotti, M. Boezio, E. A. Bogomolov, L. Bonechi, M. Bongi, V. Bonvicini,, S. Borisov, S. Bottai, A. Bruno, F. Cafagna, D. Campana, R. Carbone, P., Carlson, M. Casolino, G. Castellini, L. Consiglio
TL;DR
The PAMELA experiment measured cosmic-ray antiproton flux from 60 MeV to 180 GeV, finding results consistent with secondary production models but highlighting the need for more precise models for full interpretation.
Contribution
This work provides the most extensive measurement of cosmic-ray antiprotons over a wide energy range, extending previous data down to 60 MeV and up to 180 GeV.
Findings
Results are consistent with secondary production in the galaxy.
Approximately 1500 antiprotons observed over 850 days.
Highlights need for improved secondary production models.
Abstract
The satellite-borne experiment PAMELA has been used to make a new measurement of the cosmic-ray antiproton flux and the antiproton-to-proton flux ratio which extends previously published measurements down to 60 MeV and up to 180 GeV in kinetic energy. During 850 days of data acquisition approximately 1500 antiprotons were observed. The measurements are consistent with purely secondary production of antiprotons in the galaxy. More precise secondary production models are required for a complete interpretation of the results.
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