Precise measurements of cosmic-ray antiproton spectrum in a positive phase of the solar cycle

T. Maeno; M. Nozaki; S. Orito; H. Matsunaga; K. Abe; K. Anraku; Y. Asaoka; M. Fujikawa; M. Imori; Y. Makida; N. Matsui; H. Matsumoto; J. Mitchell; T. Mitsui; A. Moiseev; M. Motoki; J. Nishimura; J. Ormes; T. Saeki; T. Sanuki; M. Sasaki; E. S. Seo; Y. Shikaze; T. Sonoda; R. Streitmatter; J. Suzuki; K. Tanaka; I. Ueda; J. Z. Wang; N. Yajima; T. Yamagami; A. Yamamoto; T. Yoshida; K. Yoshimura

doi:10.1016/S0273-1177(01)00129-6

Precise measurements of cosmic-ray antiproton spectrum in a positive phase of the solar cycle

T. Maeno^*, M. Nozaki, S. Orito, H. Matsunaga, K. Abe, K. Anraku, Y. Asaoka, M. Fujikawa, M. Imori, Y. Makida, N. Matsui, H. Matsumoto, J. Mitchell, T. Mitsui, A. Moiseev, M. Motoki, J. Nishimura, J. Ormes, T. Saeki, T. SanukiM. Sasaki, E. S. Seo, Y. Shikaze, T. Sonoda, R. Streitmatter, J. Suzuki, K. Tanaka, I. Ueda, J. Z. Wang, N. Yajima, T. Yamagami, A. Yamamoto, T. Yoshida, K. Yoshimura

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

The BESS spectrometer has measured the energy spectrum of cosmic-ray antiprotons successively in 1993, 1995, 1997 and 1998. In total, 848 antiprotons were clearly identified in energy range 0.18 to 4.20 GeV based on magnetic-rigidity, time-of-flight, energy loss, and Cherenkov radiation measurements. The measured antiproton spectra and antiproton/proton ratios were nearly identical at the upper end of the instrumental energy range, which is consistent with theoretical calculations. In the low energy region, our data show variations that are somewhat larger than expected. This might be due to statistical fluctuation, or might suggest a contribution of primary antiprotons from novel sources.

Original language	English
Pages (from-to)	711-716
Number of pages	6
Journal	Advances in Space Research
Volume	27
Issue number	4
DOIs	https://doi.org/10.1016/S0273-1177(01)00129-6
Publication status	Published - 2001
Externally published	Yes

ASJC Scopus subject areas

Aerospace Engineering
Astronomy and Astrophysics
Geophysics
Atmospheric Science
Space and Planetary Science
Earth and Planetary Sciences(all)

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Maeno, T., Nozaki, M., Orito, S., Matsunaga, H., Abe, K., Anraku, K., Asaoka, Y., Fujikawa, M., Imori, M., Makida, Y., Matsui, N., Matsumoto, H., Mitchell, J., Mitsui, T., Moiseev, A., Motoki, M., Nishimura, J., Ormes, J., Saeki, T., ... Yoshimura, K. (2001). Precise measurements of cosmic-ray antiproton spectrum in a positive phase of the solar cycle. Advances in Space Research, 27(4), 711-716. https://doi.org/10.1016/S0273-1177(01)00129-6

Maeno, T, Nozaki, M, Orito, S, Matsunaga, H, Abe, K, Anraku, K, Asaoka, Y, Fujikawa, M, Imori, M, Makida, Y, Matsui, N, Matsumoto, H, Mitchell, J, Mitsui, T, Moiseev, A, Motoki, M, Nishimura, J, Ormes, J, Saeki, T, Sanuki, T, Sasaki, M, Seo, ES, Shikaze, Y, Sonoda, T, Streitmatter, R, Suzuki, J, Tanaka, K, Ueda, I, Wang, JZ, Yajima, N, Yamagami, T, Yamamoto, A, Yoshida, T & Yoshimura, K 2001, 'Precise measurements of cosmic-ray antiproton spectrum in a positive phase of the solar cycle', Advances in Space Research, vol. 27, no. 4, pp. 711-716. https://doi.org/10.1016/S0273-1177(01)00129-6

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title = "Precise measurements of cosmic-ray antiproton spectrum in a positive phase of the solar cycle",

abstract = "The BESS spectrometer has measured the energy spectrum of cosmic-ray antiprotons successively in 1993, 1995, 1997 and 1998. In total, 848 antiprotons were clearly identified in energy range 0.18 to 4.20 GeV based on magnetic-rigidity, time-of-flight, energy loss, and Cherenkov radiation measurements. The measured antiproton spectra and antiproton/proton ratios were nearly identical at the upper end of the instrumental energy range, which is consistent with theoretical calculations. In the low energy region, our data show variations that are somewhat larger than expected. This might be due to statistical fluctuation, or might suggest a contribution of primary antiprotons from novel sources.",

author = "T. Maeno and M. Nozaki and S. Orito and H. Matsunaga and K. Abe and K. Anraku and Y. Asaoka and M. Fujikawa and M. Imori and Y. Makida and N. Matsui and H. Matsumoto and J. Mitchell and T. Mitsui and A. Moiseev and M. Motoki and J. Nishimura and J. Ormes and T. Saeki and T. Sanuki and M. Sasaki and Seo, {E. S.} and Y. Shikaze and T. Sonoda and R. Streitmatter and J. Suzuki and K. Tanaka and I. Ueda and Wang, {J. Z.} and N. Yajima and T. Yamagami and A. Yamamoto and T. Yoshida and K. Yoshimura",

year = "2001",

doi = "10.1016/S0273-1177(01)00129-6",

language = "English",

volume = "27",

pages = "711--716",

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issn = "0273-1177",

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T1 - Precise measurements of cosmic-ray antiproton spectrum in a positive phase of the solar cycle

AU - Maeno, T.

AU - Nozaki, M.

AU - Orito, S.

AU - Matsunaga, H.

AU - Abe, K.

AU - Anraku, K.

AU - Asaoka, Y.

AU - Fujikawa, M.

AU - Imori, M.

AU - Makida, Y.

AU - Matsui, N.

AU - Matsumoto, H.

AU - Mitchell, J.

AU - Mitsui, T.

AU - Moiseev, A.

AU - Motoki, M.

AU - Nishimura, J.

AU - Ormes, J.

AU - Saeki, T.

AU - Sanuki, T.

AU - Sasaki, M.

AU - Seo, E. S.

AU - Shikaze, Y.

AU - Sonoda, T.

AU - Streitmatter, R.

AU - Suzuki, J.

AU - Tanaka, K.

AU - Ueda, I.

AU - Wang, J. Z.

AU - Yajima, N.

AU - Yamagami, T.

AU - Yamamoto, A.

AU - Yoshida, T.

AU - Yoshimura, K.

PY - 2001

Y1 - 2001

N2 - The BESS spectrometer has measured the energy spectrum of cosmic-ray antiprotons successively in 1993, 1995, 1997 and 1998. In total, 848 antiprotons were clearly identified in energy range 0.18 to 4.20 GeV based on magnetic-rigidity, time-of-flight, energy loss, and Cherenkov radiation measurements. The measured antiproton spectra and antiproton/proton ratios were nearly identical at the upper end of the instrumental energy range, which is consistent with theoretical calculations. In the low energy region, our data show variations that are somewhat larger than expected. This might be due to statistical fluctuation, or might suggest a contribution of primary antiprotons from novel sources.

AB - The BESS spectrometer has measured the energy spectrum of cosmic-ray antiprotons successively in 1993, 1995, 1997 and 1998. In total, 848 antiprotons were clearly identified in energy range 0.18 to 4.20 GeV based on magnetic-rigidity, time-of-flight, energy loss, and Cherenkov radiation measurements. The measured antiproton spectra and antiproton/proton ratios were nearly identical at the upper end of the instrumental energy range, which is consistent with theoretical calculations. In the low energy region, our data show variations that are somewhat larger than expected. This might be due to statistical fluctuation, or might suggest a contribution of primary antiprotons from novel sources.

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U2 - 10.1016/S0273-1177(01)00129-6

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SP - 711

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JO - Life sciences and space research

JF - Life sciences and space research

IS - 4

ER -

Precise measurements of cosmic-ray antiproton spectrum in a positive phase of the solar cycle

Abstract

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