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Measurements of the relative abundances of high-energy cosmic-ray nuclei in the TeV/nucleon region

Measurements of the relative abundances of high-energy cosmic-ray nuclei in the TeV/nucleon region
Ahn H.S.Allison P.S.Bagliesi M.G.Barbier L.Beatty J.J.Bigongiari G.Brandt T.J.Childers J.T.Conklin N.B.Coutu S.Duvernois M.A.Ganel O.Han J.H.Jeon J.A.Kim K.C.Lee J.Lee M.H.Maestro P.Malinin A.Marrocchesi P.S.Minnick S.Mognet S.I.Na G.W.Nam J.Nam S.Nutter S.Park I.H.Park N.H.Seo E.S.Sina R.Walpole P.Wu J.Yang J.Yoon Y.S.Zei R.Zinn S.Y.
Ewha Authors
양종만scopusscopus; 박일흥scopusscopus; 남신우scopusscopus
Issue Date
Journal Title
Astrophysical Journal Letters
2041-8205JCR Link
Astrophysical Journal Letters vol. 715, no. 2, pp. 1400 - 1407
Document Type
We present measurements of the relative abundances of cosmic-ray nuclei in the energy range of 500-3980 GeV/nucleon from the second flight of the Cosmic Ray Energetics And Mass balloon-borne experiment. Particle energy was determined using a sampling tungsten/scintillating-fiber calorimeter, while particle charge was identified precisely with a dual-layer silicon charge detector installed for this flight. The resulting element ratios C/O, N/O, Ne/O, Mg/O, Si/O, and Fe/O at the top of atmosphere are 0.919 ± 0.123stat 0.030syst, 0.076 ± 0.019stat 0.013syst, 0.115 ± 0.031stat 0.004syst, 0.153 ± 0.039stat 0.005syst, 0.180 ± 0.045stat 0.006syst, and 0.139 ± 0.043stat 0.005 syst, respectively, which agree with measurements at lower energies. The source abundance of N/O is found to be 0.054 ± 0.013stat 0.009syst+0.010esc -0.017. The cosmic-ray source abundances are compared to local Galactic (LG) abundances as a function of first ionization potential and as a function of condensation temperature. At high energies the trend that the cosmic-ray source abundances at large ionization potential or low condensation temperature are suppressed compared to their LG abundances continues. Therefore, the injection mechanism must be the same at TeV/nucleon energies as at the lower energies measured by HEAO-3, CRN, and TRACER. Furthermore, the cosmic-ray source abundances are compared to a mixture of 80% solar system abundances and 20% massive stellar outflow (MSO) as a function of atomic mass. The good agreement with TIGER measurements at lower energies confirms the existence of a substantial fraction of MSO material required in the TeV per nucleon region. © 2010. The American Astronomical Society. All rights reserved.
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