Journal
ASTROPHYSICAL JOURNAL
Volume 839, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/aa68e4
Keywords
astroparticle physics; balloons; cosmic rays; methods: data analysis
Categories
Funding
- U.S. by NASA grants [NNX11AC50G, NNX11AC52G]
- Mexico by DGAPA-UNAM grant [IN109617]
- Korea by the National Research Foundation grants [2015R1A2A1A01006870, 2015R1A2A1A15055344]
- NASA in the U.S.
- KICOS
- Ministry of Science and Technology in Korea
- IN2P3
- CNRS
- CNES in France
- NASA [NNX11AC52G, 147276, NNX11AC50G, 148669] Funding Source: Federal RePORTER
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Primary cosmic-ray elemental spectra have been measured with the balloon-borne Cosmic Ray Energetics And Mass (CREAM) experiment since 2004. The third CREAM payload (CREAM-III) flew for 29 days during the 2007-2008 Antarctic season. Energies of incident particles above 1 TeV are measured with a calorimeter. Individual elements are clearly separated with a charge resolution of similar to 0.12 e (in charge units) and similar to 0.14 e for protons and helium nuclei, respectively, using two layers of silicon charge detectors. The measured proton and helium energy spectra at the top of the atmosphere are harder than other existing measurements at a few tens of GeV. The relative abundance of protons to helium nuclei is 9.53 +/- 0.03 for the range of 1 TeV/n. to 63 TeV/n. This ratio is considerably smaller than other measurements at a few tens of GeV/n. The spectra become softer above similar to 20 TeV. However, our statistical uncertainties are large at these energies and more data are needed.
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