BESS-polar II measurements of the cosmic-ray proton and helium spectra at solar minimum

K. Sakai, K. Abe, H. Fuke, S. Haino, T. Hams, M. Hasegawa, A. Horikoshi, K. C. Kim, A. Kusumoto, M. H. Lee, Y. Makida, S. Matsuda, Y. Matsukawa, J. W. Mitchell, J. Nishimura, M. Nozaki, R. Orito, J. F. Ormes, M. Sasaki, E. S. SeoR. Shinoda, R. E. Streitmatter, J. Suzuki, K. Tanaka, N. Thakur, T. Yamagami, A. Yamamoto, T. Yoshida, Koji Yoshimura

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The energy spectra of cosmic-ray protons and helium near solar minimum were precisely measured with BESS-Polar II (Balloon-borne Experiment with a Superconducting Spectrometer) during a long-duration flight over Antarctica in December 2007 and January 2008, and are discussed here. The absolute fluxes and spectral shapes of primary protons and helium probe the origin and the propagation history of cosmic rays in the Galaxy. The spectra are also essential as inputs to calculate the spectrum of cosmic-ray antiprotons, which are secondary products of cosmic-ray interactions with the interstellar gas. To optimize the measurement of the magnetic rigidity of incident particles, obtained from the curvature of their trajectories in a solenoidal magnetic field of 0.8 Tesla, an improved calibration of the central JET-type drift chamber and two inner drift chambers was developed. Using this, we obtained absolute spectra of primary cosmic-ray protons up to around 120 GeV and helium up to around 50 GeV/nucleon.

Original languageEnglish
Title of host publicationProceedings of the 33rd International Cosmic Rays Conference, ICRC 2013
PublisherSociedade Brasileira de Fisica
Volume2013-October
ISBN (Electronic)9788589064293
Publication statusPublished - Jan 1 2013
Event33rd International Cosmic Rays Conference, ICRC 2013 - Rio de Janeiro, Brazil
Duration: Jul 2 2013Jul 9 2013

Other

Other33rd International Cosmic Rays Conference, ICRC 2013
CountryBrazil
CityRio de Janeiro
Period7/2/137/9/13

Fingerprint

BESS (satellite)
cosmic rays
helium
protons
chambers
magnetic rigidity
primary cosmic rays
interstellar gas
Antarctic regions
balloons
antiprotons
energy spectra
curvature
trajectories
histories
flight
spectrometers
galaxies
propagation
probes

Keywords

  • Cosmic-ray helium
  • Cosmic-ray proton
  • Solar minimum
  • Superconducting spectrometer

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Sakai, K., Abe, K., Fuke, H., Haino, S., Hams, T., Hasegawa, M., ... Yoshimura, K. (2013). BESS-polar II measurements of the cosmic-ray proton and helium spectra at solar minimum. In Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013 (Vol. 2013-October). Sociedade Brasileira de Fisica.

BESS-polar II measurements of the cosmic-ray proton and helium spectra at solar minimum. / Sakai, K.; Abe, K.; Fuke, H.; Haino, S.; Hams, T.; Hasegawa, M.; Horikoshi, A.; Kim, K. C.; Kusumoto, A.; Lee, M. H.; Makida, Y.; Matsuda, S.; Matsukawa, Y.; Mitchell, J. W.; Nishimura, J.; Nozaki, M.; Orito, R.; Ormes, J. F.; Sasaki, M.; Seo, E. S.; Shinoda, R.; Streitmatter, R. E.; Suzuki, J.; Tanaka, K.; Thakur, N.; Yamagami, T.; Yamamoto, A.; Yoshida, T.; Yoshimura, Koji.

Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013. Vol. 2013-October Sociedade Brasileira de Fisica, 2013.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Sakai, K, Abe, K, Fuke, H, Haino, S, Hams, T, Hasegawa, M, Horikoshi, A, Kim, KC, Kusumoto, A, Lee, MH, Makida, Y, Matsuda, S, Matsukawa, Y, Mitchell, JW, Nishimura, J, Nozaki, M, Orito, R, Ormes, JF, Sasaki, M, Seo, ES, Shinoda, R, Streitmatter, RE, Suzuki, J, Tanaka, K, Thakur, N, Yamagami, T, Yamamoto, A, Yoshida, T & Yoshimura, K 2013, BESS-polar II measurements of the cosmic-ray proton and helium spectra at solar minimum. in Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013. vol. 2013-October, Sociedade Brasileira de Fisica, 33rd International Cosmic Rays Conference, ICRC 2013, Rio de Janeiro, Brazil, 7/2/13.
Sakai K, Abe K, Fuke H, Haino S, Hams T, Hasegawa M et al. BESS-polar II measurements of the cosmic-ray proton and helium spectra at solar minimum. In Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013. Vol. 2013-October. Sociedade Brasileira de Fisica. 2013
Sakai, K. ; Abe, K. ; Fuke, H. ; Haino, S. ; Hams, T. ; Hasegawa, M. ; Horikoshi, A. ; Kim, K. C. ; Kusumoto, A. ; Lee, M. H. ; Makida, Y. ; Matsuda, S. ; Matsukawa, Y. ; Mitchell, J. W. ; Nishimura, J. ; Nozaki, M. ; Orito, R. ; Ormes, J. F. ; Sasaki, M. ; Seo, E. S. ; Shinoda, R. ; Streitmatter, R. E. ; Suzuki, J. ; Tanaka, K. ; Thakur, N. ; Yamagami, T. ; Yamamoto, A. ; Yoshida, T. ; Yoshimura, Koji. / BESS-polar II measurements of the cosmic-ray proton and helium spectra at solar minimum. Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013. Vol. 2013-October Sociedade Brasileira de Fisica, 2013.
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N2 - The energy spectra of cosmic-ray protons and helium near solar minimum were precisely measured with BESS-Polar II (Balloon-borne Experiment with a Superconducting Spectrometer) during a long-duration flight over Antarctica in December 2007 and January 2008, and are discussed here. The absolute fluxes and spectral shapes of primary protons and helium probe the origin and the propagation history of cosmic rays in the Galaxy. The spectra are also essential as inputs to calculate the spectrum of cosmic-ray antiprotons, which are secondary products of cosmic-ray interactions with the interstellar gas. To optimize the measurement of the magnetic rigidity of incident particles, obtained from the curvature of their trajectories in a solenoidal magnetic field of 0.8 Tesla, an improved calibration of the central JET-type drift chamber and two inner drift chambers was developed. Using this, we obtained absolute spectra of primary cosmic-ray protons up to around 120 GeV and helium up to around 50 GeV/nucleon.

AB - The energy spectra of cosmic-ray protons and helium near solar minimum were precisely measured with BESS-Polar II (Balloon-borne Experiment with a Superconducting Spectrometer) during a long-duration flight over Antarctica in December 2007 and January 2008, and are discussed here. The absolute fluxes and spectral shapes of primary protons and helium probe the origin and the propagation history of cosmic rays in the Galaxy. The spectra are also essential as inputs to calculate the spectrum of cosmic-ray antiprotons, which are secondary products of cosmic-ray interactions with the interstellar gas. To optimize the measurement of the magnetic rigidity of incident particles, obtained from the curvature of their trajectories in a solenoidal magnetic field of 0.8 Tesla, an improved calibration of the central JET-type drift chamber and two inner drift chambers was developed. Using this, we obtained absolute spectra of primary cosmic-ray protons up to around 120 GeV and helium up to around 50 GeV/nucleon.

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