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

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

Proceedings of Science 2017

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  • Título:
    Measurement of the cosmic-ray antiproton spectrum in the range 0.12 to 0.4 GeV with BESS-Polar II
  • Autor: 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
  • Notas: In: [Proceedings of the 35th International Cosmic Ray Conference (ICRC 2017)]. (pp. 174:1-174:8). Proceedings of Science (2017)
  • Descrição: 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.
  • Editor: Proceedings of Science
  • Data de criação/publicação: 2017
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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