Precision measurement of antiproton to proton ratio with the Alpha Magnetic Spectrometer on the International Space Station

2016/12/31 by F. Nozzoli, Francesco Nozzoli, Nozzoli, Francesco
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #Instrumentation and Detectors (physics.ins-det) #Solar and Space Plasma Dynamics #astro-ph.HE #physics.ins-det

paper · pdf · doi:10.48550/arxiv.1701.00086

XXV ECRS 2016 Proceedings - eConf C16-09-04.3

openalex publication_date 2016/12/31 · arxiv created 2017/01/31 · arxiv updated 2017/02/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

A precision measurement by AMS of the antiproton-to-proton flux ratio in primary cosmic rays in the absolute rigidity range from 1 to 450 GV is presented based on 3.49×10⁵ antiproton events and 2.42×10⁹ proton events. Above ∼60 GV the antiproton to proton flux ratio is consistent with being rigidity independent. A decreasing behaviour is expected for this ratio considering the traditional models for the secondary antiproton flux.

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