PoS - Proceedings of Science
Volume 395 - 37th International Cosmic Ray Conference (ICRC2021) - CRD - Cosmic Ray Direct
Cosmic-ray beryllium isotope ratio measured by BESS-Polar II
T. Wada*, K. Abe, H. Fuke, S. Haino, T. Hams, M. Hasegawa, K.T. Kim, M.H. Lee, Y. Makida, J.W. Mitchell, J. Nishimura, M. Nozaki, R. Orito, J.F. Ormes, K. Sakai, M. Sasaki, E.S. Seo, R.E. Streitmatter, N. Thakur, A. Yamamoto, T. Yoshida and K. Yoshimura
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Pre-published on: July 07, 2021
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Abstract
The Balloon-borne Experiment with a Superconducting Spectrometer (BESS) has carried out precise observation of the low-energy cosmic rays. Using a tracking system (in a 0.8 T uniform magnetic field) with a rigidity resolution of ∼0.4% at 1GV and a time-of-flight system with a time resolution of 120 ps, the BESS instrument enables us to distinguish isotope events. In December-January 2007-2008, BESS-Polar II achieved a 24.5-day observation during its balloon flight over Antarctica. By using 4.7 billion cosmic-ray event data obtained during the flight, rare $^{10}$Be events have been searched and analyzed. In this paper, we will report the analysis process of the beryllium isotope ratio measured by the BESS-Polar II.
DOI: https://doi.org/10.22323/1.395.0132
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