Speaker
Description
The analysis of cosmic ray nuclei provides critical insights for a theoretical
understanding of the acceleration and propagation mechanisms of charged particles in
our Galaxy. A unique source of information on the average path length that cosmic
rays travel before reaching Earth can be provided by the elements lying just below iron
in the periodic table (sub-iron). These elements are believed to be produced by the
spallation of heavier nuclei as they propagate in the interstellar medium. The
Calorimetric Electron Telescope (CALET), which has been operational on the
International Space Station since 2015, has collected a substantial dataset comprising
cosmic-ray (CR) iron and sub-iron events across a broad energy spectrum. In this
contribution we present the measurements of the energy dependence of the titanium
and chromium fluxes in cosmic rays, as their flux ratios to iron, in the energy interval
from 10 GeV/n to 250 GeV/n. The measurements, based on data collected during eight
years of operation, are reported with significantly enhanced precision compared to
existing measurements, including a detailed assessment of systematic uncertainties. In
addition to the sub-iron fluxes, an update of CALET's analysis of the iron flux has
been carried out up to 1.6 TeV/n.
| Collaboration(s) | CALET |
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