Cosmic-Ray Carbon and Oxygen Spectra at High Energies from the ISS-CREAM Experiment

by Sinchul Kang (PhD Candidate)

Friday Nov 19, 2021, 4:00 PM → 5:00 PM Asia/Seoul

119호 (제1과학관)

Cosmic-ray carbon and oxygen spectra at high energies can provide important infor- mation on the origin, acceleration, and propagations of cosmic rays in the Galaxy. The Cosmic-Ray Energetics And Mass for the International Space Station (ISS- CREAM) experiment was designed to study high-energy cosmic rays up to PeV. This experiment recorded data from August 22nd, 2017, to February 12th, 2019, on the ISS. In this analysis, the Silicon Charge Detector (SCD), CALorimeter (CAL), and Top and Bottom Counting Detectors (TCD/BCD) are used. The SCD provides the measurement of cosmic-ray charges with a resolution of $\sim 0.2 e$. The CAL is designed to measure the incident cosmic-ray particles energies and provides a high energy trigger. The TCD/BCD provide a low energy trigger. The efficiencies and tracking resolution are calculated from Monte-Carlo (MC) data. The carbon and oxygen spectra were measured from $\sim 1$ TeV/n. The measured spectra show power- law distribution with a spectral index of −2.39±0.15 for carbon and −2.42±0.17 for oxygen. The ratio of carbon to oxygen fluxes is $\sim 1.5$, consistent with other previous experiments. In this thesis, analysis for carbon and oxygen spectra will be discussed.

Supervisor: Prof. Hongjoo Kim