Preliminary elemental spectra from protons to iron nuclei with ISS-CREAM

The ISS-CREAM experiment aims to measure spectra of cosmic-ray particles up to 1000 TeV from protons to iron nuclei. The detector was designed to complement other current space-based cosmic-ray missions and was installed on the ISS on August 22, 2017. During 539 days of on-orbit operations, ISS-CREAM recorded over 58 million events. Various subsystem issues occurred during on-orbit operations, reducing the period of stable operation of a 4-layer silicon charge detector and a tungsten/scintillating-fiber sampling calorimeter to about 225 live days. The development of more extensive calibrations is currently in progress to address the significant systematic errors associated with energy determination. We report preliminary elemental spectra of protons and helium, carbon, oxygen, neon, magnesium, silicon, and iron nuclei.