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Antiprotons and Elementary Particles over a Solar Cycle: Results from the Alpha Magnetic Spectrometer

  • (AMS Collaboration)
  • CIEMAT
  • National Institute for Nuclear Physics
  • Massachusetts Institute of Technology
  • Laboratório de Instrumentação e Física Experimental de Partículas
  • Jülich Research Centre
  • CERN
  • University of Trento
  • University of Hawai'i at Mānoa
  • University of Perugia
  • NASA Johnson Space Center
  • University of Groningen
  • University of Rome La Sapienza
  • University of Geneva
  • National Research Council of Italy
  • Academia Sinica - Institute of Physics
  • CAS - Institute of High Energy Physics
  • University of Chinese Academy of Sciences
  • Shandong Institute of Advanced Technology
  • Zhejiang University
  • RWTH Aachen University
  • Université Grenoble Alpes
  • University of Bologna
  • Shandong University

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

We present results over an 11-year Solar cycle of cosmic antiprotons based on 1.1×106 events in the rigidity range from 1.00 to 41.9 GV. The p¯ fluxes exhibit distinct properties. The magnitude of the p¯ flux temporal variation is significantly smaller than those of p, e-, and e+. A hysteresis between the p¯ fluxes and the p fluxes is observed, whereas the p¯ and e- fluxes show a linear correlation. With a model-independent analysis, we found a universal relation between the shape of the rigidity spectrum and the magnitude of flux temporal variation over an 11-year Solar cycle for both positively and negatively charged particles. The simultaneous results on p¯ and p, e-, and e+ provide unique information for understanding particle transport in the Solar System as a function of mass, charge, and spectral shape.

Original languageEnglish
Article number051002
JournalPhysical Review Letters
Volume134
Issue number5
DOIs
StatePublished - 7 Feb 2025

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