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Energy spectra of cosmic-ray nuclei at high energies

Title
Energy spectra of cosmic-ray nuclei at high energies
Authors
Ahn H.S.Allison P.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 M.H.Maestro P.Malinine A.Marrocchesi P.S.Minnick S.Mognet S.I.Nam S.W.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
양종만박일흥남신우
SCOPUS Author ID
양종만scopus
Issue Date
2009
Journal Title
Astrophysical Journal Letters
ISSN
2041-8205JCR Link
Citation
vol. 707, no. 1, pp. 593 - 603
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
We present new measurements of the energy spectra of cosmic-ray (CR) nuclei from the second flight of the balloon-borne experiment Cosmic-Ray Energetics And Mass (CREAM). The instrument included different particle detectors to provide redundant charge identification and measure the energy of CRs up to several hundred TeV. The measured individual energy spectra of C, O, Ne, Mg, Si, and Fe are presented up to 1014 eV. The spectral shape looks nearly the same for these primary elements and it can be fitted to an E -2.66 0.04 power law in energy. Moreover, a new measurement of the absolute intensity of nitrogen in the 100-800 GeV/n energy range with smaller errors than previous observations, clearly indicates a hardening of the spectrum at high energy. The relative abundance of N/O at the top of the atmosphere is measured to be 0.080 0.025 (stat.)0.025 (sys.) at 800 GeV/n, in good agreement with a recent result from the first CREAM flight. © 2009. The American Astronomical Society. All rights reserved.
DOI
10.1088/0004-637X/707/1/593
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자연과학대학 > 물리학전공 > Journal papers
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