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Measurement of the Cosmic-Ray Antiproton Spectrum at Solar Minimum with a Long-Duration Balloon Flight over AntarcticaThe energy spectrum of cosmic-ray antiprotons (p-bar's) from 0.17 to 3.5 GeV has been measured using 7886 p-bar's detected by BESS-Polar II during a long-duration flight over Antarctica near solar minimum in December 2007 and January 2008. This shows good consistency with secondary p-bar calculations. Cosmologically primary p-bar's have been investigated by comparing measured and calculated p-bar spectra. BESS-Polar II data.show no evidence of primary p-bar's from the evaporation of primordial black holes.
Document ID
20120016513
Document Type
Reprint (Version printed in journal)
Authors
Abe, K. (Kobe Univ. Hyogo, Japan)
Fuke, H. (Japan Aerospace Exploration Agency Kanagawa, Japan)
Haino, S. (High Energy Accelerator Research Organization Ibaraki, Japan)
Hams, T. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hasegawa, M. (High Energy Accelerator Research Organization Ibaraki, Japan)
Horikoshi, A. (High Energy Accelerator Research Organization Ibaraki, Japan)
Kim, K. C. (Maryland Univ. College Park, MD, United States)
Kusumoto, A. (Kobe Univ. Hyogo, Japan)
Lee, M. H. (Maryland Univ. College Park, MD, United States)
Makida, Y. (High Energy Accelerator Research Organization Ibaraki, Japan)
Matsuda, S. (High Energy Accelerator Research Organization Ibaraki, Japan)
Matsukawa, Y. (Kobe Univ. Hyogo, Japan)
Mitchell, J. W. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Nishimura, J. (Tokyo Univ. Japan)
Nozaki, M. (High Energy Accelerator Research Organization Ibaraki, Japan)
Orito, R. (Kobe Univ. Hyogo, Japan)
Ormes, J. F. (Denver Univ. Denver, CO, United States)
Sakai, K. (Tokyo Univ. Japan)
Sasaki, M. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Seo, E. S. (Maryland Univ. College Park, MD, United States)
Shinoda, R. (Tokyo Univ. Japan)
Streitmatter, R. E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Suzuki, J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Tanaka, K. (High Energy Accelerator Research Organization Ibaraki, Japan)
Thakur, N. (Denver Univ. Denver, CO, United States)
Date Acquired
August 26, 2013
Publication Date
January 31, 2012
Publication Information
Publication: Physical Review Letters
Volume: 108
Issue: 5
Subject Category
Astrophysics
Report/Patent Number
GSFC.JA.7346.2012
Distribution Limits
Public
Copyright
Other