PoS - Proceedings of Science
Volume 395 - 37th International Cosmic Ray Conference (ICRC2021) - CRD - Cosmic Ray Direct
Analysis Result of the High-Energy Cosmic-Ray Proton Spectrum from the ISS-CREAM Experiment
G. Choi*, S. Aggarwal, Y. Amare, D. Angelaszek, D. Bowman, Y.C. Chen, M. Copley, L. Derome, L. Eraud, C. Falana, A. Gerrety, J.H. Han, H.G. Huh, A. Haque, Y.S. Hwang, H.J. Hyun, H.B. Jeon, J.A. Jeon, S. Jeong, S.C. Kang, H.J. Kim, K.C. Kim, M.H. Kim, H.Y. Lee, J. Lee, M.H. Lee, L. Lu, J.P. Lundquist, L. Lutz, A. Menchaca-Rocha, O. Ofoha, H. Park, I.H. Park, J.M. Park, N. Picot-Clemente, R. Scrandis, E.S. Seo, J.R. Smith, R. Takeishi, P. Walpole, R.P. Weinmann, H. Wu, J. Wu, Z. Yin, Y.S. Yoon and H.G. Zhanget al. (click to show)
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Pre-published on: July 16, 2021
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Abstract
The Cosmic Ray Energetics And Mass for the International Space Station (ISS-CREAM) experiment successfully recorded the data for about 539 days from August 2017 to February 2019. In this talk, we report the measurement of the cosmic-ray proton energy spectrum from the ISS-CREAM experiment in the energy range of 2.5 TeV - 650 TeV. For the analysis, we used the silicon charge detector (SCD) placed at the top of the ISS-CREAM payload to identify the incoming cosmic-ray charge. The SCD is finely segmented to minimize charge misidentification due to backscatter effects. The four-layer SCD consists of 10,752 silicon pixels, each of which is 1.37×1.57×0.05 cm^3 in size. The calorimeter (CAL) consists of 20 layers of tungsten/scintillating fibers preceded by carbon targets. It provided cosmic-ray tracking, energy determination, and the high-energy trigger. The Top and Bottom Counting detectors (T/BCD) are above and below the CAL, respectively, and provided the low energy trigger. Each T/BCD is composed of an array of 20×20 photodiodes on plastic scintillators. The measured proton spectral index of 2.67±0.02 between 2.5 and 12.5 TeV is consistent with prior CREAM measurements. The spectrum softens above∼10 TeV consistent with the bump-like structure as reported by CREAM-I+III, DAMPE, and NUCLEON, but ISS-CREAM extends measurements to higher energies than those prior measurement
DOI: https://doi.org/10.22323/1.395.0094
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