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Search for Cosmic-Ray Antiproton Origins and for Cosmological Antimatter with BESSThe balloon-borne experiment with a superconducting spectrometer (BESS) has performed cosmic-ray observations as a US-Japan cooperative space science program, and has provided fundamental data on cosmic rays to study elementary particle phenomena in the early Universe. The BESS experiment has measured the energy spectra of cosmic-ray antiprotons to investigate signatures of possible exotic origins such as dark matter candidates or primordial black holes. and searched for heavier antinuclei that might reach Earth from antimatter domains formed in the early Universe. The apex of the BESS program was reached with the Antarctic flight of BESS-Polar II, during the 2007- 2008 Austral Summer, that obtained over 4.7 billion cosmic-ray events from 24.5 days of observation. The flight took place at the expected solar minimum, when the sensitivity of the low-energy antiproton measurements to a primary source is greatest. Here, we report the scientific restults, focusing on the long-duration flights of BESS-Polar I (2004) and BESS-Polar II (2007-2008).
Document ID
20120014324
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
External Source(s)
doi:10.1016/j.asr.2011.07.012
Authors
Yamamoto, A. (High Energy Accelerator Research Organization Tsukuba, Japan)
Mitchell, J. W. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Yoshimura, K. (High Energy Accelerator Research Organization Tsukuba, Japan)
Abe, K. (Kobe Univ. Japan)
Fuke, H. (Japan Aerospace Exploration Agency Sagamihara, Japan)
Haino, S. (High Energy Accelerator Research Organization Tsukuba, Japan)
Hams, T. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hasegawa, M. (High Energy Accelerator Research Organization Tsukuba, Japan)
Horikoshi, A. (High Energy Accelerator Research Organization Tsukuba, Japan)
Itazaki, A. (Kobe Univ. Japan)
Kim, K. C. (Maryland Univ. College Park, MD, United States)
Kumazawa, T. (High Energy Accelerator Research Organization Tsukuba, Japan)
Kusumoto, A. (Kobe Univ. Japan)
Lee, M. H. (Maryland Univ. College Park, MD, United States)
Makida, M. (High Energy Accelerator Research Organization Tsukuba, Japan)
Matsuda, S. (High Energy Accelerator Research Organization Tsukuba, Japan)
Matsukawa, Y. (Kobe Univ. Japan)
Matsumoto, K. (High Energy Accelerator Research Organization Tsukuba, Japan)
Moiseev, A. A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Myers, Z. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Nishimura, J. (Tokyo Univ. Japan)
Nozaki, M. (High Energy Accelerator Research Organization Tsukuba, Japan)
Orito, R. (Kobe Univ. Japan)
Sasaki, M. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Streitmatter, R. E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 26, 2013
Publication Date
August 5, 2011
Subject Category
Astronomy
Report/Patent Number
GSFC.JA.6882.2012
Distribution Limits
Public
Copyright
Public Use Permitted.

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