Observation of cosmic-ray antiprotons at energies below 500 MeV

K. Yoshimura; S. Orito; 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; J. Ormes; T. Saeki; R. Streitmatter; J. Suzuki; K. Tanaka; N. Yajima; T. Yamagami; A. Yamamoto; T. Yoshida

doi:10.1103/PhysRevLett.75.3792

Observation of cosmic-ray antiprotons at energies below 500 MeV

K. Yoshimura, S. Orito, 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, J. Ormes, T. Saeki, R. Streitmatter, J. SuzukiK. Tanaka, N. Yajima, T. Yamagami, A. Yamamoto, T. Yoshida

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Abstract

A search for cosmic-ray antiprotons was performed using a balloon-borne experiment with a superconducting magnetic rigidity spectrometer (BESS). We have detected four antiprotons in the kinetic energy range between 300 and 500 MeV, the first antiprotons to be identified by a direct mass measurement. The corresponding p»p flux ratio at the top of the atmosphere is found to be 1.2-0.65+1.0 × 10-5. No antiprotons were observed in the range between 175 and 300 MeV, resulting in a 90% C.L. upper limit on the flux ratio of 2.9 × 10-5.

Original language	English
Pages (from-to)	3792-3795
Number of pages	4
Journal	Physical review letters
Volume	75
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevLett.75.3792
Publication status	Published - 1995
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1103/PhysRevLett.75.3792

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Yoshimura, K., Orito, S., 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., Ormes, J., Saeki, T., Streitmatter, R., ... Yoshida, T. (1995). Observation of cosmic-ray antiprotons at energies below 500 MeV. Physical review letters, 75(21), 3792-3795. https://doi.org/10.1103/PhysRevLett.75.3792

Yoshimura, K, Orito, S, 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, Ormes, J, Saeki, T, Streitmatter, R, Suzuki, J, Tanaka, K, Yajima, N, Yamagami, T, Yamamoto, A & Yoshida, T 1995, 'Observation of cosmic-ray antiprotons at energies below 500 MeV', Physical review letters, vol. 75, no. 21, pp. 3792-3795. https://doi.org/10.1103/PhysRevLett.75.3792

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title = "Observation of cosmic-ray antiprotons at energies below 500 MeV",

abstract = "A search for cosmic-ray antiprotons was performed using a balloon-borne experiment with a superconducting magnetic rigidity spectrometer (BESS). We have detected four antiprotons in the kinetic energy range between 300 and 500 MeV, the first antiprotons to be identified by a direct mass measurement. The corresponding p»p flux ratio at the top of the atmosphere is found to be 1.2-0.65+1.0 × 10-5. No antiprotons were observed in the range between 175 and 300 MeV, resulting in a 90% C.L. upper limit on the flux ratio of 2.9 × 10-5.",

author = "K. Yoshimura and S. Orito 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 J. Ormes and T. Saeki and R. Streitmatter and J. Suzuki and K. Tanaka and N. Yajima and T. Yamagami and A. Yamamoto and T. Yoshida",

year = "1995",

doi = "10.1103/PhysRevLett.75.3792",

language = "English",

volume = "75",

pages = "3792--3795",

journal = "Physical Review Letters",

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T1 - Observation of cosmic-ray antiprotons at energies below 500 MeV

AU - Yoshimura, K.

AU - Orito, S.

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 - Ormes, J.

AU - Saeki, T.

AU - Streitmatter, R.

AU - Suzuki, J.

AU - Tanaka, K.

AU - Yajima, N.

AU - Yamagami, T.

AU - Yamamoto, A.

AU - Yoshida, T.

PY - 1995

Y1 - 1995

N2 - A search for cosmic-ray antiprotons was performed using a balloon-borne experiment with a superconducting magnetic rigidity spectrometer (BESS). We have detected four antiprotons in the kinetic energy range between 300 and 500 MeV, the first antiprotons to be identified by a direct mass measurement. The corresponding p»p flux ratio at the top of the atmosphere is found to be 1.2-0.65+1.0 × 10-5. No antiprotons were observed in the range between 175 and 300 MeV, resulting in a 90% C.L. upper limit on the flux ratio of 2.9 × 10-5.

AB - A search for cosmic-ray antiprotons was performed using a balloon-borne experiment with a superconducting magnetic rigidity spectrometer (BESS). We have detected four antiprotons in the kinetic energy range between 300 and 500 MeV, the first antiprotons to be identified by a direct mass measurement. The corresponding p»p flux ratio at the top of the atmosphere is found to be 1.2-0.65+1.0 × 10-5. No antiprotons were observed in the range between 175 and 300 MeV, resulting in a 90% C.L. upper limit on the flux ratio of 2.9 × 10-5.

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DO - 10.1103/PhysRevLett.75.3792

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SP - 3792

EP - 3795

JO - Physical Review Letters

JF - Physical Review Letters

IS - 21

ER -

Observation of cosmic-ray antiprotons at energies below 500 MeV

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