Cosmic-ray antiproton flux in the energy range from 200 to 600 MeV

A. Moiseev; K. Yoshimura; I. Ueda; K. Anraku; R. Golden; M. Imori; S. Inaba; B. Kimbell; N. Kimura; Y. Makida; H. Matsumoto; H. Matsunaga; J. Mitchell; M. Motoki; J. Nishimura; M. Nozaki; S. Orito; J. Ormes; T. Saeki; E. S. Seo; S. Stochaj; R. Streitmatter; J. Suzuki; K. Tanaka; N. Yajima; T. Yamagami; A. Yamamoto; T. Yoshida

doi:10.1086/303463

Cosmic-ray antiproton flux in the energy range from 200 to 600 MeV

A. Moiseev, K. Yoshimura, I. Ueda, K. Anraku, R. Golden, M. Imori, S. Inaba, B. Kimbell, N. Kimura, Y. Makida, H. Matsumoto, H. Matsunaga, J. Mitchell, M. Motoki, J. Nishimura, M. Nozaki, S. Orito, J. Ormes, T. Saeki, E. S. SeoS. Stochaj, R. Streitmatter, J. Suzuki, K. Tanaka, N. Yajima, T. Yamagami, A. Yamamoto, T. Yoshida

Organization for Innovations in Data Synergy (organization affiliation only)

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Abstract

We have studied the low-energy antiprotons in the cosmic rays by utilizing data obtained by the Balloon-borne Experiment with a Superconducting magnetic rigidity Spectrometer (BESS) flown in 1993 July from Lynn Lake, Manitoba, Canada. A detailed description of the event selection criteria and background corrections is given. Seven antiprotons are found that give an antiproton flux of 6.4_-3.5^+5.5 × 10^-3(m² sr s GeV)^-1 and an antiproton/proton ratio of 5.2_-2.8^+4.4 × 10^-6 in the 200-600 MeV energy range. These results are consistent with a secondary origin of low-energy cosmic-ray antiprotons within our uncertainties, but they still require the precise measurement of the spectrum shape below 500 MeV to clarify exactly the model of particle propagation and possible contributions from exotic sources.

Original language	English
Pages (from-to)	479-489
Number of pages	11
Journal	Astrophysical Journal
Volume	474
Issue number	1 PART I
DOIs	https://doi.org/10.1086/303463
Publication status	Published - 1997

Keywords

Balloons
Cosmic rays
Elementary particles

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10.1086/303463

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Moiseev, A., Yoshimura, K., Ueda, I., Anraku, K., Golden, R., Imori, M., Inaba, S., Kimbell, B., Kimura, N., Makida, Y., Matsumoto, H., Matsunaga, H., Mitchell, J., Motoki, M., Nishimura, J., Nozaki, M., Orito, S., Ormes, J., Saeki, T., ... Yoshida, T. (1997). Cosmic-ray antiproton flux in the energy range from 200 to 600 MeV. Astrophysical Journal, 474(1 PART I), 479-489. https://doi.org/10.1086/303463

@article{af386603765f4314901f419479d66cf2,

title = "Cosmic-ray antiproton flux in the energy range from 200 to 600 MeV",

abstract = "We have studied the low-energy antiprotons in the cosmic rays by utilizing data obtained by the Balloon-borne Experiment with a Superconducting magnetic rigidity Spectrometer (BESS) flown in 1993 July from Lynn Lake, Manitoba, Canada. A detailed description of the event selection criteria and background corrections is given. Seven antiprotons are found that give an antiproton flux of 6.4-3.5+5.5 × 10-3(m2 sr s GeV)-1 and an antiproton/proton ratio of 5.2-2.8+4.4 × 10-6 in the 200-600 MeV energy range. These results are consistent with a secondary origin of low-energy cosmic-ray antiprotons within our uncertainties, but they still require the precise measurement of the spectrum shape below 500 MeV to clarify exactly the model of particle propagation and possible contributions from exotic sources.",

keywords = "Balloons, Cosmic rays, Elementary particles",

author = "A. Moiseev and K. Yoshimura and I. Ueda and K. Anraku and R. Golden and M. Imori and S. Inaba and B. Kimbell and N. Kimura and Y. Makida and H. Matsumoto and H. Matsunaga and J. Mitchell and M. Motoki and J. Nishimura and M. Nozaki and S. Orito and J. Ormes and T. Saeki and Seo, {E. S.} and S. Stochaj and R. Streitmatter and J. Suzuki and K. Tanaka and N. Yajima and T. Yamagami and A. Yamamoto and T. Yoshida",

year = "1997",

doi = "10.1086/303463",

language = "English",

volume = "474",

pages = "479--489",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1 PART I",

}

Moiseev, A, Yoshimura, K, Ueda, I, Anraku, K, Golden, R, Imori, M, Inaba, S, Kimbell, B, Kimura, N, Makida, Y, Matsumoto, H, Matsunaga, H, Mitchell, J, Motoki, M, Nishimura, J, Nozaki, M, Orito, S, Ormes, J, Saeki, T, Seo, ES, Stochaj, S, Streitmatter, R, Suzuki, J, Tanaka, K, Yajima, N, Yamagami, T, Yamamoto, A & Yoshida, T 1997, 'Cosmic-ray antiproton flux in the energy range from 200 to 600 MeV', Astrophysical Journal, vol. 474, no. 1 PART I, pp. 479-489. https://doi.org/10.1086/303463

TY - JOUR

T1 - Cosmic-ray antiproton flux in the energy range from 200 to 600 MeV

AU - Moiseev, A.

AU - Yoshimura, K.

AU - Ueda, I.

AU - Anraku, K.

AU - Golden, R.

AU - Imori, M.

AU - Inaba, S.

AU - Kimbell, B.

AU - Kimura, N.

AU - Makida, Y.

AU - Matsumoto, H.

AU - Matsunaga, H.

AU - Mitchell, J.

AU - Motoki, M.

AU - Nishimura, J.

AU - Nozaki, M.

AU - Orito, S.

AU - Ormes, J.

AU - Saeki, T.

AU - Seo, E. S.

AU - Stochaj, S.

AU - Streitmatter, R.

AU - Suzuki, J.

AU - Tanaka, K.

AU - Yajima, N.

AU - Yamagami, T.

AU - Yamamoto, A.

AU - Yoshida, T.

PY - 1997

Y1 - 1997

N2 - We have studied the low-energy antiprotons in the cosmic rays by utilizing data obtained by the Balloon-borne Experiment with a Superconducting magnetic rigidity Spectrometer (BESS) flown in 1993 July from Lynn Lake, Manitoba, Canada. A detailed description of the event selection criteria and background corrections is given. Seven antiprotons are found that give an antiproton flux of 6.4-3.5+5.5 × 10-3(m2 sr s GeV)-1 and an antiproton/proton ratio of 5.2-2.8+4.4 × 10-6 in the 200-600 MeV energy range. These results are consistent with a secondary origin of low-energy cosmic-ray antiprotons within our uncertainties, but they still require the precise measurement of the spectrum shape below 500 MeV to clarify exactly the model of particle propagation and possible contributions from exotic sources.

AB - We have studied the low-energy antiprotons in the cosmic rays by utilizing data obtained by the Balloon-borne Experiment with a Superconducting magnetic rigidity Spectrometer (BESS) flown in 1993 July from Lynn Lake, Manitoba, Canada. A detailed description of the event selection criteria and background corrections is given. Seven antiprotons are found that give an antiproton flux of 6.4-3.5+5.5 × 10-3(m2 sr s GeV)-1 and an antiproton/proton ratio of 5.2-2.8+4.4 × 10-6 in the 200-600 MeV energy range. These results are consistent with a secondary origin of low-energy cosmic-ray antiprotons within our uncertainties, but they still require the precise measurement of the spectrum shape below 500 MeV to clarify exactly the model of particle propagation and possible contributions from exotic sources.

KW - Balloons

KW - Cosmic rays

KW - Elementary particles

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UR - http://www.scopus.com/inward/citedby.url?scp=33749201486&partnerID=8YFLogxK

U2 - 10.1086/303463

DO - 10.1086/303463

M3 - Article

AN - SCOPUS:33749201486

SN - 0004-637X

VL - 474

SP - 479

EP - 489

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 PART I

ER -

Cosmic-ray antiproton flux in the energy range from 200 to 600 MeV

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Keywords

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