Sakai, K;
Abe, JK;
Fuke, H;
Haino, S;
Hams, T;
Hasegawa, M;
Kim, KC;
... Yoshimura, K; + view all
(2017)
Measurement of the cosmic-ray antiproton spectrum in the range 0.12 to 0.4 GeV with BESS-Polar II.
In:
[Proceedings of the 35th International Cosmic Ray Conference (ICRC 2017)].
(pp. 174:1-174:8).
Proceedings of Science
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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.
| Type: | Proceedings paper |
|---|---|
| Title: | Measurement of the cosmic-ray antiproton spectrum in the range 0.12 to 0.4 GeV with BESS-Polar II |
| Event: | ICRC 2017, 35th International Cosmic Ray Conference, 10–20 July 2017, Bexco, Busan, Korea |
| Open access status: | An open access version is available from UCL Discovery |
| Publisher version: | https://pos.sissa.it/301/ |
| Language: | English |
| Additional information: | Copyright © owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0) (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10048832 |
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