Results from the CALET Ultra-Heavy Cosmic-Ray Analysis

The Calorimetric Electron Telescope (CALET), launched to the International Space Station in August 2015 and in continuous operation since, measures cosmic-ray (CR) electrons, nuclei, and gamma rays. CALET, with its 27 radiation length deep Total Absorption Calorimeter (TASC), measures particle energy, allowing for the determination of primary and secondary nuclei spectra and secondary to primary ratios of the more abundant CR nuclei through ₂₈Ni, while the main charge detector (CHD) can measure Ultra-Heavy (UH) CR nuclei up to and beyond ₄₀Zr. By using the special high-duty cycle (~90%) UH trigger in conjunction with a data selection cut that requires events to pass into the TASC, we leverage energy information in our charge assignment routine. Simulations using Geant4 and EPICS are then used to determine corrections for charge-changing interactions in the instrument. We show the relative abundances (to 26Fe) based on nine years of observations for 13 ≤ Z ≤ 44 and compare these results to previous CALET UHCR analysis and published values from ACE-CRIS, SuperTIGER, and HEAO-3.