Detected Abundances of Nuclei Relative to ₂₆Fe for Elements ₁₄Si through ₄₄Ru with CALET on the International Space Station
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Adriani, O., Y. Akaike, K. Asano, T. Hams, et al. “Detected Abundances of Nuclei Relative to ₂₆Fe for Elements ₁₄Si through ₄₄Ru with CALET on the International Space Station.” The Astrophysical Journal 988, no. 2 (2025): 148. https://doi.org/10.3847/1538-4357/ade3cc.
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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract
The Calorimetric Electron Telescope (CALET), launched to the International Space Station (ISS) in 2015 August and continuously operating since, measures cosmic-ray (CR) electrons, nuclei, and gamma rays. CALET, with its 27 radiation length deep Total Absorption Calorimeter, measures particle energy and allows for the measurement of spectra, secondary to primary ratios of the more abundant CR nuclei through ₂₈Ni, while the main charge detector can measure ultra-heavy CR nuclei through ₄₄Ru. The results for the abundances of elements from Z = 14 to Z = 44 relative to ₂₆Fe over 7.5 yr of observation are presented here and compared to previous measurements from ACE-CRIS, SuperTIGER, and HEAO-3.