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Your search keyword '"Cosmic-ray antiproton"' showing total 4 results
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4 results on '"Cosmic-ray antiproton"'

1. Measurement of the cosmic-ray low-energy antiproton spectrum with the first BESS-Polar Antarctic flight

Author

Abe, K., Fuke, H., Haino, S., Hams, T., Itazaki, A., Kim, K.C., Kumazawa, T., Lee, M.H., Makida, Y., Matsuda, S., Matsumoto, K., Mitchell, J.W., Moiseev, A.A., Myers, Z., Nishimura, J., Nozaki, M., Orito, R., Ormes, J.F., Sasaki, M., and Seo, E.S.

Subjects
*SPECTROMETERS, *SUPERCONDUCTORS, *COSMIC rays, *ANTIPROTONS, *SOLAR activity, *AERIAL exploration
Abstract

Abstract: The BESS-Polar spectrometer had its first successful balloon flight over Antarctica in December 2004. During the 8.5-day long-duration flight, almost 0.9 billion events were recorded and 1,520 antiprotons were detected in the energy range 0.1–4.2 GeV. In this Letter, we report the antiproton spectrum obtained, discuss the origin of cosmic-ray antiprotons, and use antiproton data to probe the effect of charge-sign-dependent drift in the solar modulation. [Copyright &y& Elsevier]

Published
2008
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2. Measurement of cosmic-ray proton and antiproton spectra at mountain altitude

Author

Sanuki, T., Fujikawa, M., Matsunaga, H., Abe, K., Anraku, K., Fuke, H., Haino, S., Imori, M., Izumi, K., Maeno, T., Makida, Y., Matsui, N., Matsumoto, H., Nishimura, J., Nozaki, M., Orito, S., Sasaki, M., Shikaze, Y., Suzuki, J., and Tanaka, K.

Subjects
*PROTONS, *ANTIPROTONS, *COSMIC rays, *SPECTRUM analysis
Abstract

Energy spectra of atmospheric secondary cosmic-ray protons and antiprotons were measured at mountain altitude, 2770 m above sea level. We observed more than 105 protons and 102 antiprotons. Our proton spectrum is generally consistent with other previous measurements. The observed antiproton spectrum suggests that the energy loss due to non-annihilation processes is less significant than that assumed in previous model calculations. [Copyright &y& Elsevier]

Published
2003
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3. Direct and Indirect Constraints on Isospin-Violating Dark Matter.

Author

Zhou, Yu-Feng

Subjects
*DARK matter, *ISOBARIC spin, *CONSTRAINTS (Physics), *OPTICAL interference, *PROTON scattering, *NEUTRON scattering, *ANTIPROTONS
Abstract

Abstract: The scenario of isospin-violating dark matter (IVDM) with destructive interference between DM-proton and DM-neutron scatterings provides a potential possibility to reconcile the experimental results of DAMA, CoGeNT and XENON. We explore the constraints on the IVDM from other direct detection experiments such as CRESST and SIMPLE, etc. and from the indirect DM searches such as the antiproton flux measured by BESS-Polar II. The results show that the relevant couplings in IVDM scenario are severely constrained. [Copyright &y& Elsevier]

Published
2014
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4. Measurement of cosmic-ray low-energy antiproton spectrum with the first BESS-Polar Antarctic flight

Author

Hams, T., Kim, K. C., Lee, M. H., Mitchell, J. W., Moiseev, A. A., Myers, Z., Ormes, J. F., Seo, E. S., Streitmatter, R. E., Abe, Ko, Fuke, Hideyuki, Haino, Sadakazu, Itazaki, A., Kumazawa, Teruyuki, Makida, Yasuhiro, Matsuda, Shinya, Matsumoto, Kenji, Nishimura, Jun, Nozaki, Mitsuaki, Orito, Reiko, Sasaki, Makoto, Shikaze, Yoshiaki, Suzuki, Junichi, Takasugi, Yoshiyuki, Takeuchi, Kazuma, Tanaka, K., Yamagami, Takamasa, Yamamoto, Akira, Yoshida, Tetsuya, and Yoshimura, Koji

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Solar modulation, Spectrometer, Astrophysics (astro-ph), FOS: Physical sciences, Cosmic-ray antiproton, Cosmic ray, Astrophysics, 01 natural sciences, Nuclear physics, Low energy, 13. Climate action, Antiproton, 0103 physical sciences, Polar, Superconducting spectrometer, High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment, 010303 astronomy & astrophysics
Abstract

The BESS-Polar spectrometer had its first successful balloon flight over Antarctica in December 2004. During the 8.5-day long-duration flight, almost 0.9 billion events were recorded and 1,520 antiprotons were detected in the energy range 0.1-4.2 GeV. In this paper, we report the antiproton spectrum obtained, discuss the origin of cosmic-ray antiprotons, and use antiprotons to probe the effect of charge sign dependent drift in the solar modulation., 18 pages, 1 table, 5 figures, submitted to Physics Letters B

Published
2008

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