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

Journal Article · · Physical Review Letters
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We present results over an 11-year Solar cycle of cosmic antiprotons based on 1.1 × 10 6 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. Published by the American Physical Society 2025

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2510921
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 5 Vol. 134; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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