GALPROP v57 fits show injection-spectrum breaks (alone or with a diffusion break) better reproduce cosmic-ray hardening than diffusion alone, while p/He softening needs a further break and the positron excess needs a primary source.
Measurement of Boron and Carbon Fluxes in Cosmic Rays with the PAMELA Experiment
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Analyzing Cosmic Ray Spectral Features: A Numerical Investigation
GALPROP v57 fits show injection-spectrum breaks (alone or with a diffusion break) better reproduce cosmic-ray hardening than diffusion alone, while p/He softening needs a further break and the positron excess needs a primary source.