Measurement of the cosmic-ray antiproton spectrum in the range 0.12 to 0.4 GeV with BESS-Polar II
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 (L...
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ftucl:oai:eprints.ucl.ac.uk.OAI2:10048832 2023-12-24T10:11:28+01:00 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 2017 text https://discovery.ucl.ac.uk/id/eprint/10048832/1/ICRC2017_174.pdf https://discovery.ucl.ac.uk/id/eprint/10048832/ eng eng Proceedings of Science https://discovery.ucl.ac.uk/id/eprint/10048832/1/ICRC2017_174.pdf https://discovery.ucl.ac.uk/id/eprint/10048832/ open In: [Proceedings of the 35th International Cosmic Ray Conference (ICRC 2017)]. (pp. 174:1-174:8). Proceedings of Science (2017) Proceedings paper 2017 ftucl 2023-11-27T13:07:34Z 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. Report Antarc* Antarctica University College London: UCL Discovery |
institution |
Open Polar |
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University College London: UCL Discovery |
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ftucl |
language |
English |
description |
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. |
format |
Report |
author |
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 |
spellingShingle |
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 Measurement of the cosmic-ray antiproton spectrum in the range 0.12 to 0.4 GeV with BESS-Polar II |
author_facet |
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 |
author_sort |
Sakai, K |
title |
Measurement of the cosmic-ray antiproton spectrum in the range 0.12 to 0.4 GeV with BESS-Polar II |
title_short |
Measurement of the cosmic-ray antiproton spectrum in the range 0.12 to 0.4 GeV with BESS-Polar II |
title_full |
Measurement of the cosmic-ray antiproton spectrum in the range 0.12 to 0.4 GeV with BESS-Polar II |
title_fullStr |
Measurement of the cosmic-ray antiproton spectrum in the range 0.12 to 0.4 GeV with BESS-Polar II |
title_full_unstemmed |
Measurement of the cosmic-ray antiproton spectrum in the range 0.12 to 0.4 GeV with BESS-Polar II |
title_sort |
measurement of the cosmic-ray antiproton spectrum in the range 0.12 to 0.4 gev with bess-polar ii |
publisher |
Proceedings of Science |
publishDate |
2017 |
url |
https://discovery.ucl.ac.uk/id/eprint/10048832/1/ICRC2017_174.pdf https://discovery.ucl.ac.uk/id/eprint/10048832/ |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
In: [Proceedings of the 35th International Cosmic Ray Conference (ICRC 2017)]. (pp. 174:1-174:8). Proceedings of Science (2017) |
op_relation |
https://discovery.ucl.ac.uk/id/eprint/10048832/1/ICRC2017_174.pdf https://discovery.ucl.ac.uk/id/eprint/10048832/ |
op_rights |
open |
_version_ |
1786165633999699968 |