Proton and Helium Spectra from the CREAM-III Flight

Y. S. Yoon, T. Anderson, A. Barrau, N. B. Conklin, S. Coutu, L. Derome, J. H. Han, J. A. Jeon, K. C. Kim, M. H. Kim, H. Y. Lee, J. Lee, M. H. Lee, S. E. Lee, J. T. Link, A. Menchaca-Rocha, J. W. Mitchell, S. I. Mognet, S. Nutter, I. H. ParkN. Picot-Clemente, A. Putze, E. S. Seo, J. Smith, J. Wu

Research output: Contribution to journalArticle

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Abstract

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 ∼0.12 e (in charge units) and ∼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 ∼20 TeV. However, our statistical uncertainties are large at these energies and more data are needed.

Original languageEnglish (US)
Article number5
JournalAstrophysical Journal
Volume839
Issue number1
DOIs
StatePublished - Apr 10 2017

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cosmic ray
helium
cosmic rays
energetics
flight
protons
primary cosmic rays
nuclei
balloons
proton energy
energy
payloads
calorimeters
energy spectra
silicon
atmospheres
relative abundance
detectors
atmosphere
experiment

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Yoon, Y. S. ; Anderson, T. ; Barrau, A. ; Conklin, N. B. ; Coutu, S. ; Derome, L. ; Han, J. H. ; Jeon, J. A. ; Kim, K. C. ; Kim, M. H. ; Lee, H. Y. ; Lee, J. ; Lee, M. H. ; Lee, S. E. ; Link, J. T. ; Menchaca-Rocha, A. ; Mitchell, J. W. ; Mognet, S. I. ; Nutter, S. ; Park, I. H. ; Picot-Clemente, N. ; Putze, A. ; Seo, E. S. ; Smith, J. ; Wu, J. / Proton and Helium Spectra from the CREAM-III Flight. In: Astrophysical Journal. 2017 ; Vol. 839, No. 1.
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abstract = "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 ∼0.12 e (in charge units) and ∼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 ∼20 TeV. However, our statistical uncertainties are large at these energies and more data are needed.",
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Yoon, YS, Anderson, T, Barrau, A, Conklin, NB, Coutu, S, Derome, L, Han, JH, Jeon, JA, Kim, KC, Kim, MH, Lee, HY, Lee, J, Lee, MH, Lee, SE, Link, JT, Menchaca-Rocha, A, Mitchell, JW, Mognet, SI, Nutter, S, Park, IH, Picot-Clemente, N, Putze, A, Seo, ES, Smith, J & Wu, J 2017, 'Proton and Helium Spectra from the CREAM-III Flight', Astrophysical Journal, vol. 839, no. 1, 5. https://doi.org/10.3847/1538-4357/aa68e4

Proton and Helium Spectra from the CREAM-III Flight. / Yoon, Y. S.; Anderson, T.; Barrau, A.; Conklin, N. B.; Coutu, S.; Derome, L.; Han, J. H.; Jeon, J. A.; Kim, K. C.; Kim, M. H.; Lee, H. Y.; Lee, J.; Lee, M. H.; Lee, S. E.; Link, J. T.; Menchaca-Rocha, A.; Mitchell, J. W.; Mognet, S. I.; Nutter, S.; Park, I. H.; Picot-Clemente, N.; Putze, A.; Seo, E. S.; Smith, J.; Wu, J.

In: Astrophysical Journal, Vol. 839, No. 1, 5, 10.04.2017.

Research output: Contribution to journalArticle

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T1 - Proton and Helium Spectra from the CREAM-III Flight

AU - Yoon, Y. S.

AU - Anderson, T.

AU - Barrau, A.

AU - Conklin, N. B.

AU - Coutu, S.

AU - Derome, L.

AU - Han, J. H.

AU - Jeon, J. A.

AU - Kim, K. C.

AU - Kim, M. H.

AU - Lee, H. Y.

AU - Lee, J.

AU - Lee, M. H.

AU - Lee, S. E.

AU - Link, J. T.

AU - Menchaca-Rocha, A.

AU - Mitchell, J. W.

AU - Mognet, S. I.

AU - Nutter, S.

AU - Park, I. H.

AU - Picot-Clemente, N.

AU - Putze, A.

AU - Seo, E. S.

AU - Smith, J.

AU - Wu, J.

PY - 2017/4/10

Y1 - 2017/4/10

N2 - 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 ∼0.12 e (in charge units) and ∼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 ∼20 TeV. However, our statistical uncertainties are large at these energies and more data are needed.

AB - 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 ∼0.12 e (in charge units) and ∼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 ∼20 TeV. However, our statistical uncertainties are large at these energies and more data are needed.

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