Measurement of the cosmic-ray antiproton spectrum in the range 0.12 to 0.4 GeV with BESS-Polar II

K. Sakai; J. K. Abe; H. Fuke; S. Haino; T. Hams; M. Hasegawa; K. C. Kim; M. H. Lee; Y. Makida; J. W. Mitchell; J. Nishimura; M. Nozaki; R. Orito; J. F. Ormes; N. Picot-Clemente; M. Sasaki; E. S. Seo; R. E. Streitmatter; J. Suzuki; K. Tanaka; N. Thakur; A. Yamamoto; T. Yoshida; K. Yoshimura

doi:10.22323/1.301.0174

Measurement of the cosmic-ray antiproton spectrum in the range 0.12 to 0.4 GeV with BESS-Polar II

K. Sakai, J. K. Abe, H. Fuke, S. Haino, T. Hams, M. Hasegawa, K. C. Kim, M. H. Lee, Y. Makida, J. W. Mitchell, J. Nishimura, M. Nozaki, R. Orito, J. F. Ormes, N. Picot-Clemente, M. Sasaki, E. S. Seo, R. E. Streitmatter, J. Suzuki, K. TanakaN. Thakur, A. Yamamoto, T. Yoshida, K. Yoshimura

Research Institute for Interdisciplinary Science

Research output: Contribution to journal › Conference article › peer-review

Abstract

The energy spectra of cosmic-ray antiprotons and protons near solar minimum were precisely measured with BESS-Polar II (Balloon-borne Experiment with a Superconducting Spectrometer) during a long-duration flight over Antarctica in December 2007 and January 2008. The upper-TOF (UTOF) and lower-TOF (LTOF) scintillator hodoscopes measure the charge and velocity of incident particles. A thin plastic scintillator middle-TOF (MTOF) hodoscope is installed on the lower surface of the magnet bore to measure low-energy particles that cannot reach the LTOF. The MTOF further lowers the threshold energy to about 120 MeV for antiproton or proton measurements. We report absolute spectra of the cosmic-ray antiproton in the range 0.12 to 0.4 GeV and the antiproton/proton ratio calculated with UTOF-MTOF trigger events. These new results are independent of the UTOF-LTOF triggered antiproton spectrum published in 2012 and proton spectrum published in 2016.

Original language	English
Journal	Proceedings of Science
DOIs	https://doi.org/10.22323/1.301.0174
Publication status	Published - 2017
Event	35th International Cosmic Ray Conference, ICRC 2017 - Bexco, Busan, Korea, Republic of Duration: Jul 10 2017 → Jul 20 2017

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10.22323/1.301.0174

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Sakai, K., Abe, J. K., Fuke, H., Haino, S., Hams, T., Hasegawa, M., Kim, K. C., Lee, M. H., Makida, Y., Mitchell, J. W., Nishimura, J., Nozaki, M., Orito, R., Ormes, J. F., Picot-Clemente, N., Sasaki, M., Seo, E. S., Streitmatter, R. E., Suzuki, J., ... Yoshimura, K. (2017). Measurement of the cosmic-ray antiproton spectrum in the range 0.12 to 0.4 GeV with BESS-Polar II. Proceedings of Science. https://doi.org/10.22323/1.301.0174

Sakai, K, Abe, JK, Fuke, H, Haino, S, Hams, T, Hasegawa, M, Kim, KC, Lee, MH, Makida, Y, Mitchell, JW, Nishimura, J, Nozaki, M, Orito, R, Ormes, JF, Picot-Clemente, N, Sasaki, M, Seo, ES, Streitmatter, RE, Suzuki, J, Tanaka, K, Thakur, N, Yamamoto, A, Yoshida, T & Yoshimura, K 2017, 'Measurement of the cosmic-ray antiproton spectrum in the range 0.12 to 0.4 GeV with BESS-Polar II', Proceedings of Science. https://doi.org/10.22323/1.301.0174

@article{7b962d731903444f86770285f3e01ff7,

title = "Measurement of the cosmic-ray antiproton spectrum in the range 0.12 to 0.4 GeV with BESS-Polar II",

abstract = "The energy spectra of cosmic-ray antiprotons and protons near solar minimum were precisely measured with BESS-Polar II (Balloon-borne Experiment with a Superconducting Spectrometer) during a long-duration flight over Antarctica in December 2007 and January 2008. The upper-TOF (UTOF) and lower-TOF (LTOF) scintillator hodoscopes measure the charge and velocity of incident particles. A thin plastic scintillator middle-TOF (MTOF) hodoscope is installed on the lower surface of the magnet bore to measure low-energy particles that cannot reach the LTOF. The MTOF further lowers the threshold energy to about 120 MeV for antiproton or proton measurements. We report absolute spectra of the cosmic-ray antiproton in the range 0.12 to 0.4 GeV and the antiproton/proton ratio calculated with UTOF-MTOF trigger events. These new results are independent of the UTOF-LTOF triggered antiproton spectrum published in 2012 and proton spectrum published in 2016.",

author = "K. Sakai and Abe, {J. K.} and H. Fuke and S. Haino and T. Hams and M. Hasegawa and Kim, {K. C.} and Lee, {M. H.} and Y. Makida and Mitchell, {J. W.} and J. Nishimura and M. Nozaki and R. Orito and Ormes, {J. F.} and N. Picot-Clemente and M. Sasaki and Seo, {E. S.} and Streitmatter, {R. E.} and J. Suzuki and K. Tanaka and N. Thakur and A. Yamamoto and T. Yoshida and K. Yoshimura",

note = "Funding Information: loon Facility and the National Science Foundation United States Antarctic Program. We would like to express our sincere thanks for their continuous professional support. Publisher Copyright: {\textcopyright} Copyright owned by the author(s) under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives 4.0 International License (CC BY-NC-ND 4.0).; 35th International Cosmic Ray Conference, ICRC 2017 ; Conference date: 10-07-2017 Through 20-07-2017",

year = "2017",

doi = "10.22323/1.301.0174",

language = "English",

journal = "Proceedings of Science",

issn = "1824-8039",

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TY - JOUR

T1 - Measurement of the cosmic-ray antiproton spectrum in the range 0.12 to 0.4 GeV with BESS-Polar II

AU - Sakai, K.

AU - Abe, J. K.

AU - Fuke, H.

AU - Haino, S.

AU - Hams, T.

AU - Hasegawa, M.

AU - Kim, K. C.

AU - Lee, M. H.

AU - Makida, Y.

AU - Mitchell, J. W.

AU - Nishimura, J.

AU - Nozaki, M.

AU - Orito, R.

AU - Ormes, J. F.

AU - Picot-Clemente, N.

AU - Sasaki, M.

AU - Seo, E. S.

AU - Streitmatter, R. E.

AU - Suzuki, J.

AU - Tanaka, K.

AU - Thakur, N.

AU - Yamamoto, A.

AU - Yoshida, T.

AU - Yoshimura, K.

N1 - Funding Information: loon Facility and the National Science Foundation United States Antarctic Program. We would like to express our sincere thanks for their continuous professional support. Publisher Copyright: © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives 4.0 International License (CC BY-NC-ND 4.0).

PY - 2017

Y1 - 2017

N2 - The energy spectra of cosmic-ray antiprotons and protons near solar minimum were precisely measured with BESS-Polar II (Balloon-borne Experiment with a Superconducting Spectrometer) during a long-duration flight over Antarctica in December 2007 and January 2008. The upper-TOF (UTOF) and lower-TOF (LTOF) scintillator hodoscopes measure the charge and velocity of incident particles. A thin plastic scintillator middle-TOF (MTOF) hodoscope is installed on the lower surface of the magnet bore to measure low-energy particles that cannot reach the LTOF. The MTOF further lowers the threshold energy to about 120 MeV for antiproton or proton measurements. We report absolute spectra of the cosmic-ray antiproton in the range 0.12 to 0.4 GeV and the antiproton/proton ratio calculated with UTOF-MTOF trigger events. These new results are independent of the UTOF-LTOF triggered antiproton spectrum published in 2012 and proton spectrum published in 2016.

AB - The energy spectra of cosmic-ray antiprotons and protons near solar minimum were precisely measured with BESS-Polar II (Balloon-borne Experiment with a Superconducting Spectrometer) during a long-duration flight over Antarctica in December 2007 and January 2008. The upper-TOF (UTOF) and lower-TOF (LTOF) scintillator hodoscopes measure the charge and velocity of incident particles. A thin plastic scintillator middle-TOF (MTOF) hodoscope is installed on the lower surface of the magnet bore to measure low-energy particles that cannot reach the LTOF. The MTOF further lowers the threshold energy to about 120 MeV for antiproton or proton measurements. We report absolute spectra of the cosmic-ray antiproton in the range 0.12 to 0.4 GeV and the antiproton/proton ratio calculated with UTOF-MTOF trigger events. These new results are independent of the UTOF-LTOF triggered antiproton spectrum published in 2012 and proton spectrum published in 2016.

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U2 - 10.22323/1.301.0174

DO - 10.22323/1.301.0174

M3 - Conference article

AN - SCOPUS:85088206083

SN - 1824-8039

JO - Proceedings of Science

JF - Proceedings of Science

T2 - 35th International Cosmic Ray Conference, ICRC 2017

Y2 - 10 July 2017 through 20 July 2017

ER -

Measurement of the cosmic-ray antiproton spectrum in the range 0.12 to 0.4 GeV with BESS-Polar II

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