Measurement of the Cosmic-Ray Antiproton Spectrum at Solar Minimum with a Long-Duration Balloon Flight over Antarctica

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.; Sakai, K.; Sasaki, M.; Seo, E. S.; Shinoda, R.; Streitmatter, R. E.; Suzuki, J.; Tanaka, K.; Thakur, N.

The 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)

External Source(s)

doi:10.1103/PhysRevLett.108.051102

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

Report/Patent Number

Distribution Limits

Public

Other

NTRS

NTRS - NASA Technical Reports Server