Intermediate mass and heavy Galactic cosmic-ray nuclei: the case of new AMS-02 measurements. (arXiv:2102.12576v2 [astro-ph.HE] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Schroer_B/0/1/0/all/0/1">Benedikt Schroer</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Evoli_C/0/1/0/all/0/1">Carmelo Evoli</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Blasi_P/0/1/0/all/0/1">Pasquale Blasi</a>
The recent measurement of the spectra of intermediate mass nuclei and iron
nuclei carried out with the AMS-02 experiment provided us with the most
complete set of data on cosmic ray fluxes to date, and allowed us to test the
standard model for the transport of these particles through the Galaxy to the
finest details. We show that the parameters derived from lighter primary and
secondary elements in the cosmic radiation also lead to a good description of
the data on heavier nuclei, with no need to invoke different injection spectra
for such nuclei, provided the whole chain of fragmentation is properly
accounted for. The only exception to this finding is represented by iron
nuclei, which show a very unusual trend at rigidity $lesssim 100$ GV. This
trend reflects in a Fe/O ratio that is at odds with the results of the standard
model of cosmic ray transport, and is in contradiction with data collected by
HEAO, ACE-CRIS and Voyager at lower energy. We speculate on possible origins of
such findings.
The recent measurement of the spectra of intermediate mass nuclei and iron
nuclei carried out with the AMS-02 experiment provided us with the most
complete set of data on cosmic ray fluxes to date, and allowed us to test the
standard model for the transport of these particles through the Galaxy to the
finest details. We show that the parameters derived from lighter primary and
secondary elements in the cosmic radiation also lead to a good description of
the data on heavier nuclei, with no need to invoke different injection spectra
for such nuclei, provided the whole chain of fragmentation is properly
accounted for. The only exception to this finding is represented by iron
nuclei, which show a very unusual trend at rigidity $lesssim 100$ GV. This
trend reflects in a Fe/O ratio that is at odds with the results of the standard
model of cosmic ray transport, and is in contradiction with data collected by
HEAO, ACE-CRIS and Voyager at lower energy. We speculate on possible origins of
such findings.
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