Measurements of primary and atmospheric cosmic-ray spectra with the BESS-TeV spectrometer

• Published in: Physics letters. B 2004-07, Vol.594 (1-2), p.35-46
• Main Authors: Haino, S., Sanuki, T., Abe, K., Anraku, K., Asaoka, Y., Fuke, H., Imori, M., Itasaki, A., Maeno, T., Makida, Y., Matsuda, S., Matsui, N., Matsumoto, H., Mitchell, J.W., Moiseev, A.A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J.F., Sasaki, M., Seo, E.S., Shikaze, Y., Streitmatter, R.E., Suzuki, J., Takasugi, Y., Tanaka, K., Tanizaki, K., Yamagami, T., Yamamoto, A., Yamamoto, Y., Yamato, K., Yoshida, T., Yoshimura, K.
• Format: Article
• Language: English
• Subjects: Astronomical observations; Astronomy; Atmospheric muon; Atmospheric neutrino; Charged-particle spectrometers: electric and magnetic; Composition, energy spectra, and interactions; Cosmic rays; Cosmic-ray helium; Cosmic-ray proton; Earth, ocean, space; Exact sciences and technology; Experimental methods and instrumentation for elementary-particle and nuclear physics; Fundamental astronomy and astrophysics. Instrumentation, techniques, and astronomical observations; Neutrino, muon, pion, and other elementary particles. Cosmic rays; Nuclear physics; Physics; Solar system; Spectrometers and spectroscopic techniques; Superconducting spectrometer
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/j.physletb.2004.05.019

Primary and atmospheric cosmic-ray spectra were precisely measured with the BESS-TeV spectrometer. The spectrometer was upgraded from BESS-98 to achieve seven times higher resolution in momentum measurement. We report absolute fluxes of primary protons and helium nuclei in the energy ranges, 1–540 GeV and 1–250 GeV/n, respectively, and absolute flux of atmospheric muons in the momentum range 0.6–400 GeV/c.