# Measurements of Heavy Cosmic-Ray Nuclei Spectra with CALET on the ISS

## TL;DR

This paper presents initial measurements of heavy cosmic-ray nuclei spectra using the CALET instrument on the ISS, providing new insights into their origin and propagation in the galaxy.

## Contribution

It demonstrates CALET's capability to measure heavy nuclei spectra up to the highest energies directly observed, using 962 days of data.

## Key findings

- Preliminary energy spectra of heavy nuclei obtained.
- CALET can identify elements from Z=1 to 40.
- Data supports studies of cosmic-ray origin and propagation.

## Abstract

CALorimetric Electron Telescope (CALET) has been accumulating data of high-energy cosmic rays on the International Space Station since August 2015. In addition to the primary observation of the all-electron spectra, CALET also measures the spectra of nuclei, their relative abundances and secondary-to-primary ratios to the highest energy region ever directly observed in order to investigate details of their origin and propagation in the galaxy. The CALET instrument consists of two layers of segmented plastic scintillators to identify the individual elements from $Z=1$ to 40, a 3 radiation length thick tungsten-scintillating fiber imaging calorimeter to obtain complementary charge and tracking information, and a 27 radiation length thick segmented PWO calorimeter to measure the energy. In this paper, the capability of CALET to perform nuclei measurements and preliminary energy spectra of heavy nuclei components using 962 days of data is presented.